2096 lines
260 KiB
HTML
2096 lines
260 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>标准库头文件 <ranges></title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_header_ranges skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">标准库头文件</span> <ranges></h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-header.html">header</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<p>此头文件是<a href="cpp-ranges.html">范围</a>库的一部分。</p>
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<h3><span class="mw-headline" id=".E5.91.BD.E5.90.8D.E7.A9.BA.E9.97.B4.E5.88.AB.E5.90.8D">命名空间别名</span></h3>
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<table class="t-dcl-begin">
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<tbody>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">namespace</span> std <span class="br0">{</span><br /></span>
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<p> <span class="kw1">namespace</span> views <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">views</span><span class="sy4">;</span><br /></p>
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<span class="br0">}</span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td class="t-dcl-nopad"></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>提供命名空间别名 <code>std::views</code>，作为 <code>std::ranges::views</code> 的简称。</p>
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<table class="t-dsc-begin">
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<tr>
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<td colspan="2">
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<h3><span class="mw-headline" id=".E6.A6.82.E5.BF.B5">概念</span></h3>
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</td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.8C.83.E5.9B.B4.E6.A6.82.E5.BF.B5">范围概念</span></h5>
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</td>
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</tr>
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于命名空间 <code>std::ranges</code></div>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-range.html"><span class="t-lines"><span>ranges::range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定类型为范围，即它同时提供 <code>begin</code> 迭代器和 <code>end</code> 哨位<br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-sized_range.html"><span class="t-lines"><span>ranges::sized_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围可在常数时间内知晓其大小<br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-view.html"><span class="t-lines"><span>ranges::view</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围为视图，即它拥有常数时间的复制/移动/赋值<br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-input_range.html"><span class="t-lines"><span>ranges::input_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围的迭代器类型满足 <a href="cpp-iterator-input_iterator.html"><code>input_iterator</code></a><br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-output_range.html"><span class="t-lines"><span>ranges::output_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围的迭代器类型满足 <a href="cpp-iterator-output_iterator.html"><code>output_iterator</code></a><br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-forward_range.html"><span class="t-lines"><span>ranges::forward_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围的迭代器类型满足 <a href="cpp-iterator-forward_iterator.html"><code>forward_iterator</code></a><br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-bidirectional_range.html"><span class="t-lines"><span>ranges::bidirectional_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围的迭代器类型满足 <a href="cpp-iterator-bidirectional_iterator.html"><code>bidirectional_iterator</code></a><br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-random_access_range.html"><span class="t-lines"><span>ranges::random_access_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围的迭代器类型满足 <a href="cpp-iterator-random_access_iterator.html"><code>random_access_iterator</code></a><br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-contiguous_range.html"><span class="t-lines"><span>ranges::contiguous_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围的迭代器类型满足 <a href="cpp-iterator-contiguous_iterator.html"><code>contiguous_iterator</code></a><br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-common_range.html"><span class="t-lines"><span>ranges::common_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定范围拥有相同的迭代器和哨位类型<br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-viewable_range.html"><span class="t-lines"><span>ranges::viewable_range</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>指定针对 <a href="cpp-ranges-range.html"><code>range</code></a> 的要求，令其可安全转换为 <a href="cpp-ranges-view.html"><code>view</code></a><br />
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<span class="t-mark">(概念)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h3><span class="mw-headline" id=".E7.B1.BB">类</span></h3>
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</td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.8C.83.E5.9B.B4.E5.8E.9F.E8.AF.AD">范围原语</span></h5>
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</td>
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</tr>
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于命名空间 <code>std::ranges</code></div>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-iterator_t.html"><span class="t-lines"><span>ranges::iterator_t</span><span>ranges::sentinel_t</span><span>ranges::range_difference_t</span><span>ranges::range_size_t</span><span>ranges::range_value_t</span><span>ranges::range_reference_t</span><span>ranges::range_rvalue_reference_t</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>获得范围的关联类型<br />
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<span class="t-mark">(别名模板)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.A7.86.E5.9B.BE">视图</span></h5>
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</td>
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</tr>
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于命名空间 <code>std::ranges</code></div>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-view_interface.html"><span class="t-lines"><span>ranges::view_interface</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>用于定义 <a href="cpp-ranges-view.html"><code>view</code></a> 的辅助类模板，使用奇异递归模板模式<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-subrange.html"><span class="t-lines"><span>ranges::subrange</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>将迭代器/哨位对结合为一个 <a href="cpp-ranges-view.html"><code>view</code></a><br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E6.82.AC.E5.9E.82.E8.BF.AD.E4.BB.A3.E5.99.A8.E5.A4.84.E7.90.86">悬垂迭代器处理</span></h5>
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</td>
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</tr>
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于命名空间 <code>std::ranges</code></div>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-dangling.html"><span class="t-lines"><span>ranges::dangling</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>占位类型，指示不应返回迭代器或子范围，因为它可能悬垂<br />
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<span class="t-mark">(类)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-borrowed_iterator_t.html"><span class="t-lines"><span>ranges::borrowed_iterator_t</span><span>ranges::borrowed_subrange_t</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>获得塑造 <a href="cpp-ranges-borrowed_range.html"><code>borrowed_range</code></a> 的迭代器类型或子范围类型<br />
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<span class="t-mark">(别名模板)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E5.B7.A5.E5.8E.82">工厂</span></h5>
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</td>
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</tr>
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于命名空间 <code>std::ranges</code></div>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-empty_view.html"><span class="t-lines"><span>ranges::empty_view</span><span>views::empty</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>无元素的空 <a href="cpp-ranges-view.html"><code>view</code></a><br />
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<span class="t-mark">(类模板)</span> <span class="t-mark">(变量模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-single_view.html"><span class="t-lines"><span>ranges::single_view</span><span>views::single</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>含有具有指定值的单个元素的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
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<span class="t-mark">(类模板)</span> <span class="t-mark">(定制点对象)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-iota_view.html"><span class="t-lines"><span>ranges::iota_view</span><span>views::iota</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>由通过重复对某个初值自增所生成的序列组成的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
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<span class="t-mark">(类模板)</span> <span class="t-mark">(定制点对象)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-view_counted.html"><span class="t-lines"><span>views::counted</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>从迭代器和计数创建子范围<br />
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<span class="t-mark">(定制点对象)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E9.80.82.E9.85.8D.E5.99.A8">适配器</span></h5>
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</td>
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</tr>
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于命名空间 <code>std::ranges</code></div>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-all_view.html"><span class="t-lines"><span>views::all_t</span><span>views::all</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>包含 <a href="cpp-ranges-range.html"><code>range</code></a> 的所有元素的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
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<span class="t-mark">(别名模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-ref_view.html"><span class="t-lines"><span>ranges::ref_view</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>某个其他 <a href="cpp-ranges-range.html"><code>range</code></a> 的元素的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
|
|
<span class="t-mark">(类模板)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-filter_view.html"><span class="t-lines"><span>ranges::filter_view</span><span>views::filter</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>由 <a href="cpp-ranges-range.html"><code>range</code></a> 中满足某个谓词的元素构成的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
|
|
<span class="t-mark">(类模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-transform_view.html"><span class="t-lines"><span>ranges::transform_view</span><span>views::transform</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>对序列的每个元素应用某个变换函数的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
|
|
<span class="t-mark">(类模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-take_view.html"><span class="t-lines"><span>ranges::take_view</span><span>views::take</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>由另一 <a href="cpp-ranges-view.html"><code>view</code></a> 的前 N 个元素组成的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
|
|
<span class="t-mark">(类模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-join_view.html"><span class="t-lines"><span>ranges::join_view</span><span>views::join</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>由拉平 <a href="cpp-ranges-range.html"><code>range</code></a> 的 <a href="cpp-ranges-view.html"><code>view</code></a> 所获得的序列构成的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
|
|
<span class="t-mark">(类模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/ranges/split_view&action=edit&redlink=1" class="new" title="cpp/ranges/split view（页面不存在）"><span class="t-lines"><span>ranges::split_view</span><span>views::split</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>用某个分隔符切割另一 <a href="cpp-ranges-view.html"><code>view</code></a> 所获得的子范围的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
|
|
<span class="t-mark">(类模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-common_view.html"><span class="t-lines"><span>ranges::common_view</span><span>views::common</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>转换 <a href="cpp-ranges-view.html"><code>view</code></a> 为 <a href="cpp-ranges-common_range.html"><code>common_range</code></a><br />
|
|
<span class="t-mark">(类模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-reverse_view.html"><span class="t-lines"><span>ranges::reverse_view</span><span>views::reverse</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>以逆序迭代另一双向视图上的元素的 <a href="cpp-ranges-view.html"><code>view</code></a><br />
|
|
<span class="t-mark">(类模板)</span> <span class="t-mark">(范围适配器对象)</span></td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h3><span class="mw-headline" id=".E5.AE.9A.E5.88.B6.E7.82.B9.E5.AF.B9.E8.B1.A1">定制点对象</span></h3>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td colspan="2">
|
|
<h5><span class="mw-headline" id=".E8.8C.83.E5.9B.B4.E8.AE.BF.E9.97.AE">范围访问</span></h5>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc-header">
|
|
<td colspan="2">
|
|
<div>定义于命名空间 <code>std::ranges</code></div>
|
|
</td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-begin.html"><span class="t-lines"><span>ranges::begin</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>返回指向范围起始的迭代器<br />
|
|
<span class="t-mark">(定制点对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-end.html"><span class="t-lines"><span>ranges::end</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>返回指示范围结尾的哨位<br />
|
|
<span class="t-mark">(定制点对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-rbegin.html"><span class="t-lines"><span>ranges::rbegin</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>返回指向范围的逆向迭代器<br />
|
|
<span class="t-mark">(定制点对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-rend.html"><span class="t-lines"><span>ranges::rend</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>返回指向范围的逆向尾迭代器<br />
|
|
<span class="t-mark">(定制点对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-size.html"><span class="t-lines"><span>ranges::size</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>返回等于范围大小的整数<br />
|
|
<span class="t-mark">(定制点对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-empty.html"><span class="t-lines"><span>ranges::empty</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>检查范围是否为空<br />
|
|
<span class="t-mark">(定制点对象)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-ranges-data.html"><span class="t-lines"><span>ranges::data</span></span></a></div>
|
|
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
|
|
</div>
|
|
</td>
|
|
<td>获得指向连续范围的起始的指针<br />
|
|
<span class="t-mark">(定制点对象)</span></td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">概要</span></h3>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="co2">#include <initializer_list></span>
|
|
<span class="co2">#include <iterator></span>
|
|
|
|
<span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">inline</span> <span class="kw1">namespace</span> <span class="coMULTI">/* 未指明 */</span> <span class="br0">{</span>
|
|
<span class="co1">// 范围访问</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> begin <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> end <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> cbegin <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> cend <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> rbegin <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> rend <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> crbegin <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> crend <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> size <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> empty <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> data <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> cdata <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="co1">// 范围</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
<span class="kw1">using</span> iterator_t <span class="sy1">=</span> decltype<span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>declval<span class="sy1"><</span>T<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
<span class="kw1">using</span> sentinel_t <span class="sy1">=</span> decltype<span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>declval<span class="sy1"><</span>T<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept Range <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 有大小范围</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span><span class="sy1">></span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> disable_sized_range <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept SizedRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> enable_view <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">struct</span> view_base <span class="br0">{</span> <span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept View <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 其他范围细化</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept OutputRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept InputRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept ForwardRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept BidirectionalRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept RandomAccessRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept ContiguousRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept CommonRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept ViewableRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 类模板 view_interface</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> D<span class="sy1">></span>
|
|
requires is_class_v<span class="sy1"><</span>D<span class="sy1">></span> <span class="sy3">&&</span> Same<span class="sy1"><</span>D, remove_cv_t<span class="sy1"><</span>D<span class="sy1">>></span>
|
|
<span class="kw1">class</span> view_interface<span class="sy4">;</span>
|
|
|
|
<span class="co1">// 子范围</span>
|
|
<span class="kw2">enum</span> <span class="kw1">class</span> subrange_kind <span class="sy4">:</span> <span class="kw4">bool</span> <span class="br0">{</span> unsized, sized <span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>Iterator I, Sentinel<span class="sy1"><</span>I<span class="sy1">></span> S <span class="sy1">=</span> I, subrange_kind K <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy1">></span>
|
|
requires <span class="br0">(</span>K <span class="sy1">==</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span> <span class="sy3">||</span> <span class="sy3">!</span>SizedSentinel<span class="sy1"><</span>S, I<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">class</span> subrange<span class="sy4">;</span>
|
|
|
|
<span class="co1">// 悬垂迭代器处理</span>
|
|
<span class="kw1">struct</span> dangling<span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>Range R<span class="sy1">></span>
|
|
<span class="kw1">using</span> safe_iterator_t <span class="sy1">=</span> conditional_t<span class="sy1"><</span>__ForwardingRange<span class="sy1"><</span>R<span class="sy1">></span>, iterator_t<span class="sy1"><</span>R<span class="sy1">></span>, dangling<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>Range R<span class="sy1">></span>
|
|
<span class="kw1">using</span> safe_subrange_t <span class="sy1">=</span>
|
|
conditional_t<span class="sy1"><</span>__ForwardingRange<span class="sy1"><</span>R<span class="sy1">></span>, subrange<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>></span>, dangling<span class="sy1">></span><span class="sy4">;</span>
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|
|
|
<span class="co1">// 空视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
requires is_object_v<span class="sy1"><</span>T<span class="sy1">></span>
|
|
<span class="kw1">class</span> empty_view<span class="sy4">;</span>
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|
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|
<span class="kw1">namespace</span> view <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> empty_view<span class="sy1"><</span>T<span class="sy1">></span> empty<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
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|
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|
<span class="co1">// 单体视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>CopyConstructible T<span class="sy1">></span>
|
|
requires is_object_v<span class="sy1"><</span>T<span class="sy1">></span>
|
|
<span class="kw1">class</span> single_view<span class="sy4">;</span>
|
|
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|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> single <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
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|
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|
<span class="co1">// iota 视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>WeaklyIncrementable W, Semiregular Bound <span class="sy1">=</span> unreachable_sentinel_t<span class="sy1">></span>
|
|
requires __WeaklyEqualityComparableWith<span class="sy1"><</span>W, Bound<span class="sy1">></span>
|
|
<span class="kw1">class</span> iota_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> iota <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 全视图</span>
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> all <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>ViewableRange R<span class="sy1">></span>
|
|
<span class="kw1">using</span> all_view <span class="sy1">=</span> decltype<span class="br0">(</span>view<span class="sy4">::</span><span class="me2">all</span><span class="br0">(</span>declval<span class="sy1"><</span>R<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>Range R<span class="sy1">></span>
|
|
requires is_object_v<span class="sy1"><</span>R<span class="sy1">></span>
|
|
<span class="kw1">class</span> ref_view<span class="sy4">;</span>
|
|
|
|
<span class="co1">// 过滤视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange V, IndirectUnaryPredicate<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> Pred<span class="sy1">></span>
|
|
requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> is_object_v<span class="sy1"><</span>Pred<span class="sy1">></span>
|
|
<span class="kw1">class</span> filter_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> filter <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 变换视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange V, CopyConstructible F<span class="sy1">></span>
|
|
requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> is_object_v<span class="sy1"><</span>F<span class="sy1">></span> <span class="sy3">&&</span>
|
|
RegularInvocable<span class="sy1"><</span>F<span class="sy3">&</span>, iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span>
|
|
<span class="kw1">class</span> transform_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> transform <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 取部分视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>View<span class="sy1">></span> <span class="kw1">class</span> take_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> take <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 连接视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange V<span class="sy1">></span>
|
|
requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> InputRange<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span> <span class="sy3">&&</span>
|
|
<span class="br0">(</span>is_reference_v<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span> <span class="sy3">||</span>
|
|
View<span class="sy1"><</span>iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span><span class="br0">)</span>
|
|
<span class="kw1">class</span> join_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> join <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 分割视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
concept __TinyRange <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange V, ForwardRange Pattern<span class="sy1">></span>
|
|
requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> View<span class="sy1"><</span>Pattern<span class="sy1">></span> <span class="sy3">&&</span>
|
|
IndirectlyComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">></span>, iterator_t<span class="sy1"><</span>Pattern<span class="sy1">></span>, ranges<span class="sy4">::</span><span class="me2">equal_to</span><span class="sy1">></span> <span class="sy3">&&</span>
|
|
<span class="br0">(</span>ForwardRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">||</span> __TinyRange<span class="sy1"><</span>Pattern<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">class</span> split_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> split <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 计数视图</span>
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> counted <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 公共视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>View V<span class="sy1">></span>
|
|
requires <span class="br0">(</span><span class="sy3">!</span>CommonRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">class</span> common_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> common <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="co1">// 逆向视图</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>View V<span class="sy1">></span>
|
|
requires BidirectionalRange<span class="sy1"><</span>V<span class="sy1">></span>
|
|
<span class="kw1">class</span> reverse_view<span class="sy4">;</span>
|
|
|
|
<span class="kw1">namespace</span> view <span class="br0">{</span> <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> reverse <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">namespace</span> view <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">view</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> I, <span class="kw1">class</span> S, ranges<span class="sy4">::</span><span class="me2">subrange_kind</span> K<span class="sy1">></span>
|
|
<span class="kw1">struct</span> tuple_size<span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">subrange</span><span class="sy1"><</span>I, S, K<span class="sy1">>></span>
|
|
<span class="sy4">:</span> integral_constant<span class="sy1"><</span>size_t, <span class="nu0">2</span><span class="sy1">></span> <span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> I, <span class="kw1">class</span> S, ranges<span class="sy4">::</span><span class="me2">subrange_kind</span> K<span class="sy1">></span>
|
|
<span class="kw1">struct</span> tuple_element<span class="sy1"><</span><span class="nu0">0</span>, ranges<span class="sy4">::</span><span class="me2">subrange</span><span class="sy1"><</span>I, S, K<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">using</span> type <span class="sy1">=</span> I<span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> I, <span class="kw1">class</span> S, ranges<span class="sy4">::</span><span class="me2">subrange_kind</span> K<span class="sy1">></span>
|
|
<span class="kw1">struct</span> tuple_element<span class="sy1"><</span><span class="nu0">1</span>, ranges<span class="sy4">::</span><span class="me2">subrange</span><span class="sy1"><</span>I, S, K<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">using</span> type <span class="sy1">=</span> S<span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_range">概念 <a href="cpp-ranges-range.html"><code>range</code></a></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span>
|
|
concept range <span class="sy1">=</span> requires<span class="br0">(</span>T<span class="sy3">&</span> t<span class="br0">)</span> <span class="br0">{</span>
|
|
ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>t<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 对向前迭代器保持相等性</span>
|
|
ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>t<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_sized_range">概念 <a href="cpp-ranges-sized_range.html"><code>sized_range</code></a></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span>
|
|
concept sized_range <span class="sy1">=</span> range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span>
|
|
requires<span class="br0">(</span>T<span class="sy3">&</span> t<span class="br0">)</span> <span class="br0">{</span>
|
|
ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>t<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_view">概念 <a href="cpp-ranges-view.html"><code>view</code></a></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> enable_view <span class="sy1">=</span> derived_from<span class="sy1"><</span>T, view_base<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept view <span class="sy1">=</span> range<span class="sy1"><</span>T<span class="sy1">></span>
|
|
<span class="sy3">&&</span> movable<span class="sy1"><</span>T<span class="sy1">></span>
|
|
<span class="sy3">&&</span> default_initializable<span class="sy1"><</span>T<span class="sy1">></span>
|
|
<span class="sy3">&&</span> enable_view<span class="sy1"><</span>T<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_output_range">概念 <a href="cpp-ranges-output_range.html"><code>output_range</code></a></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept output_range <span class="sy1">=</span>
|
|
range<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span> output_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">></span>, T<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_input_range">概念 <a href="cpp-ranges-input_range.html"><code>input_range</code></a></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept input_range <span class="sy1">=</span>
|
|
range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> input_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_forward_range">概念 <a href="cpp-ranges-forward_range.html"><code>forward_range</code></a></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
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concept forward_range <span class="sy1">=</span>
|
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input_range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> forward_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_bidirectional_range">概念 <a href="cpp-ranges-bidirectional_range.html"><code>bidirectional_range</code></a></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
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concept bidirectional_range <span class="sy1">=</span>
|
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forward_range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> bidirectional_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_random_access_range">概念 <a href="cpp-ranges-random_access_range.html"><code>random_access_range</code></a></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept random_access_range <span class="sy1">=</span>
|
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bidirectional_range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> random_access_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_contiguous_range">概念 <a href="cpp-ranges-contiguous_range.html"><code>contiguous_range</code></a></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept contiguous_range <span class="sy1">=</span>
|
|
random_access_range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> contiguous_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>T<span class="sy1">>></span> <span class="sy3">&&</span>
|
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requires<span class="br0">(</span>T<span class="sy3">&</span> t<span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="br0">{</span> ranges<span class="sy4">::</span><span class="me2">data</span><span class="br0">(</span>t<span class="br0">)</span> <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> same_as<span class="sy1"><</span>add_pointer_t<span class="sy1"><</span>range_reference_t<span class="sy1"><</span>T<span class="sy1">>>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_common_range">概念 <a href="cpp-ranges-common_range.html"><code>common_range</code></a></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
concept common_range <span class="sy1">=</span>
|
|
range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> same_as<span class="sy1"><</span>iterator_t<span class="sy1"><</span>T<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E6.A6.82.E5.BF.B5_viewable_range">概念 <a href="cpp-ranges-viewable_range.html"><code>viewable_range</code></a></span></h4>
|
|
<p>{{source|1= namespace std::ranges {</p>
|
|
<pre> template<class T>
|
|
concept viewable_range =
|
|
range<T> && (borrowed_range<T> || view<remove_cvref_t<T>>);
|
|
</pre>
|
|
<p>}</p>
|
|
<h4><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E6.A6.82.E5.BF.B5">辅助概念</span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span> <span class="co1">// 未指定，仅用于名字查找</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
concept __SimpleView <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
View<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span> Range<span class="sy1"><</span><span class="kw4">const</span> R<span class="sy1">></span> <span class="sy3">&&</span>
|
|
Same<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">></span>, iterator_t<span class="sy1"><</span><span class="kw4">const</span> R<span class="sy1">>></span> <span class="sy3">&&</span>
|
|
Same<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>R<span class="sy1">></span>, sentinel_t<span class="sy1"><</span><span class="kw4">const</span> R<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputIterator I<span class="sy1">></span>
|
|
concept __HasArrow <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
is_pointer_v<span class="sy1"><</span>I<span class="sy1">></span> <span class="sy3">||</span> requires<span class="br0">(</span>I i<span class="br0">)</span> <span class="br0">{</span> i.<span class="me1">operator</span><span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T, <span class="kw1">class</span> U<span class="sy1">></span>
|
|
concept __NotSameAs <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="sy3">!</span>Same<span class="sy1"><</span>remove_cvref_t<span class="sy1"><</span>T<span class="sy1">></span>, remove_cvref_t<span class="sy1"><</span>U<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> I<span class="sy1">></span>
|
|
concept _Decrementable <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
Incrementable<span class="sy1"><</span>I<span class="sy1">></span> <span class="sy3">&&</span> requires<span class="br0">(</span>I i<span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="br0">{</span> <span class="sy2">--</span>i <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>I<span class="sy3">&</span><span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">{</span> i<span class="sy2">--</span> <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> I<span class="sy1">></span>
|
|
concept _Advanceable <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
_Decrementable<span class="sy1"><</span>I<span class="sy1">></span> <span class="sy3">&&</span> StrictTotallyOrdered<span class="sy1"><</span>I<span class="sy1">></span> <span class="sy3">&&</span>
|
|
requires<span class="br0">(</span>I i, <span class="kw4">const</span> I j, <span class="kw4">const</span> iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> n<span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="br0">{</span> i <span class="sy2">+</span><span class="sy1">=</span> n <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>I<span class="sy3">&</span><span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">{</span> i <span class="sy2">-</span><span class="sy1">=</span> n <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>I<span class="sy3">&</span><span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">{</span> j <span class="sy2">+</span> n <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">{</span> n <span class="sy2">+</span> j <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">{</span> j <span class="sy2">-</span> n <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">{</span> j <span class="sy2">-</span> j <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> Same<span class="sy1"><</span>iter_difference_t<span class="sy1"><</span>I<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<p>注意：这些名字仅用于阐释目的，它们不是接口的一部分。</p>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::view_interface">类模板 <span class="t-lc">std::ranges::view_interface</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> D<span class="sy1">></span>
|
|
requires is_class_v<span class="sy1"><</span>D<span class="sy1">></span> <span class="sy3">&&</span> Same<span class="sy1"><</span>D, remove_cv_t<span class="sy1"><</span>D<span class="sy1">>></span>
|
|
<span class="kw1">class</span> view_interface <span class="sy4">:</span> <span class="kw1">public</span> view_base <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw4">constexpr</span> D<span class="sy3">&</span> derived<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">return</span> <span class="kw1">static_cast</span><span class="sy1"><</span>D<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">const</span> D<span class="sy3">&</span> derived<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">return</span> <span class="kw1">static_cast</span><span class="sy1"><</span><span class="kw4">const</span> D<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">bool</span> empty<span class="br0">(</span><span class="br0">)</span> requires ForwardRange<span class="sy1"><</span>D<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">bool</span> empty<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires ForwardRange<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> operator <span class="kw4">bool</span><span class="br0">(</span><span class="br0">)</span>
|
|
requires requires <span class="br0">{</span> ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> <span class="sy3">!</span>ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> operator <span class="kw4">bool</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires requires <span class="br0">{</span> ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> <span class="sy3">!</span>ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> data<span class="br0">(</span><span class="br0">)</span> requires ContiguousIterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>D<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy4">?</span> nullptr <span class="sy4">:</span> addressof<span class="br0">(</span><span class="sy2">*</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> data<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires Range<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">></span> <span class="sy3">&&</span> ContiguousIterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy4">?</span> nullptr <span class="sy4">:</span> addressof<span class="br0">(</span><span class="sy2">*</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> requires ForwardRange<span class="sy1"><</span>D<span class="sy1">></span> <span class="sy3">&&</span>
|
|
SizedSentinel<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>D<span class="sy1">></span>, iterator_t<span class="sy1"><</span>D<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">-</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires ForwardRange<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">></span> <span class="sy3">&&</span>
|
|
SizedSentinel<span class="sy1"><</span>sentinel_t<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">></span>, iterator_t<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy2">-</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> front<span class="br0">(</span><span class="br0">)</span> requires ForwardRange<span class="sy1"><</span>D<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> front<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires ForwardRange<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> back<span class="br0">(</span><span class="br0">)</span> requires BidirectionalRange<span class="sy1"><</span>D<span class="sy1">></span> <span class="sy3">&&</span> CommonRange<span class="sy1"><</span>D<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> back<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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requires BidirectionalRange<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">></span> <span class="sy3">&&</span> CommonRange<span class="sy1"><</span><span class="kw4">const</span> D<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>RandomAccessRange R <span class="sy1">=</span> D<span class="sy1">></span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>></span> n<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">[</span>n<span class="br0">]</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">template</span><span class="sy1"><</span>RandomAccessRange R <span class="sy1">=</span> <span class="kw4">const</span> D<span class="sy1">></span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>></span> n<span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
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<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>derived<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">[</span>n<span class="br0">]</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::subrange">类模板 <span class="t-lc">std::ranges::subrange</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
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concept __PairLike <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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<span class="sy3">!</span>is_reference_v<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> requires<span class="br0">(</span>T t<span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">typename</span> tuple_size<span class="sy1"><</span>T<span class="sy1">></span><span class="sy4">::</span><span class="me2">type</span><span class="sy4">;</span> <span class="co1">// 确保 tuple_­size<T> 完整</span>
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requires DerivedFrom<span class="sy1"><</span>tuple_size<span class="sy1"><</span>T<span class="sy1">></span>, integral_constant<span class="sy1"><</span>size_t, <span class="nu0">2</span><span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw1">typename</span> tuple_element_t<span class="sy1"><</span><span class="nu0">0</span>, remove_const_t<span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw1">typename</span> tuple_element_t<span class="sy1"><</span><span class="nu0">1</span>, remove_const_t<span class="sy1"><</span>T<span class="sy1">>></span><span class="sy4">;</span>
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<span class="br0">{</span> get<span class="sy1"><</span><span class="nu0">0</span><span class="sy1">></span><span class="br0">(</span>t<span class="br0">)</span> <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> <span class="kw4">const</span> tuple_element_t<span class="sy1"><</span><span class="nu0">0</span>, T<span class="sy1">></span><span class="sy3">&</span><span class="sy4">;</span>
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<span class="br0">{</span> get<span class="sy1"><</span><span class="nu0">1</span><span class="sy1">></span><span class="br0">(</span>t<span class="br0">)</span> <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> <span class="kw4">const</span> tuple_element_t<span class="sy1"><</span><span class="nu0">1</span>, T<span class="sy1">></span><span class="sy3">&</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T, <span class="kw1">class</span> U, <span class="kw1">class</span> V<span class="sy1">></span>
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concept __PairLikeConvertibleTo <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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<span class="sy3">!</span>Range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> __PairLike<span class="sy1"><</span>remove_reference_t<span class="sy1"><</span>T<span class="sy1">>></span> <span class="sy3">&&</span>
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requires<span class="br0">(</span>T<span class="sy3">&&</span> t<span class="br0">)</span> <span class="br0">{</span>
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<span class="br0">{</span> get<span class="sy1"><</span><span class="nu0">0</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span>t<span class="br0">)</span><span class="br0">)</span> <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> ConvertibleTo<span class="sy1"><</span>U<span class="sy1">></span><span class="sy4">;</span>
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<span class="br0">{</span> get<span class="sy1"><</span><span class="nu0">1</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span>t<span class="br0">)</span><span class="br0">)</span> <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> ConvertibleTo<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T, <span class="kw1">class</span> U, <span class="kw1">class</span> V<span class="sy1">></span>
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concept __PairLikeConvertibleFrom <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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<span class="sy3">!</span>Range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> __PairLike<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> Constructible<span class="sy1"><</span>T, U, V<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
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concept __IteratorSentinelPair <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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<span class="sy3">!</span>Range<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span> __PairLike<span class="sy1"><</span>T<span class="sy1">></span> <span class="sy3">&&</span>
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Sentinel<span class="sy1"><</span>tuple_element_t<span class="sy1"><</span><span class="nu0">1</span>, T<span class="sy1">></span>, tuple_element_t<span class="sy1"><</span><span class="nu0">0</span>, T<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>Iterator I, Sentinel<span class="sy1"><</span>I<span class="sy1">></span> S <span class="sy1">=</span> I, subrange_kind K <span class="sy1">=</span>
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SizedSentinel<span class="sy1"><</span>S, I<span class="sy1">></span> <span class="sy4">?</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span> <span class="sy4">:</span> subrange_kind<span class="sy4">::</span><span class="me2">unsized</span><span class="sy1">></span>
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requires <span class="br0">(</span>K <span class="sy1">==</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span> <span class="sy3">||</span> <span class="sy3">!</span>SizedSentinel<span class="sy1"><</span>S, I<span class="sy1">></span><span class="br0">)</span>
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<span class="kw1">class</span> subrange <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>subrange<span class="sy1"><</span>I, S, K<span class="sy1">>></span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> StoreSize <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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K <span class="sy1">==</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span> <span class="sy3">&&</span> <span class="sy3">!</span>SizedSentinel<span class="sy1"><</span>S, I<span class="sy1">></span><span class="sy4">;</span>
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I begin_ <span class="sy1">=</span> I<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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S end_ <span class="sy1">=</span> S<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> size_ <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释；</span>
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<span class="co1">// 仅当 StoreSize 为 true 时才存在</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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subrange<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> subrange<span class="br0">(</span>I i, S s<span class="br0">)</span> requires <span class="br0">(</span><span class="sy3">!</span>StoreSize<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> subrange<span class="br0">(</span>I i, S s, iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> n<span class="br0">)</span>
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requires <span class="br0">(</span>K <span class="sy1">==</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>__NotSameAs<span class="sy1"><</span>subrange<span class="sy1">></span> R<span class="sy1">></span>
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requires __ForwardingRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span>
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ConvertibleTo<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">></span>, I<span class="sy1">></span> <span class="sy3">&&</span> ConvertibleTo<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>R<span class="sy1">></span>, S<span class="sy1">></span>
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<span class="kw4">constexpr</span> subrange<span class="br0">(</span>R<span class="sy3">&&</span> r<span class="br0">)</span> requires <span class="br0">(</span><span class="sy3">!</span>StoreSize <span class="sy3">||</span> SizedRange<span class="sy1"><</span>R<span class="sy1">></span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>__ForwardingRange R<span class="sy1">></span>
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requires ConvertibleTo<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">></span>, I<span class="sy1">></span> <span class="sy3">&&</span> ConvertibleTo<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>R<span class="sy1">></span>, S<span class="sy1">></span>
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<span class="kw4">constexpr</span> subrange<span class="br0">(</span>R<span class="sy3">&&</span> r, iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> n<span class="br0">)</span>
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requires <span class="br0">(</span>K <span class="sy1">==</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span><span class="br0">)</span>
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<span class="sy4">:</span> subrange<span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>r<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>r<span class="br0">)</span>, n<span class="br0">}</span>
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<span class="br0">{</span><span class="br0">}</span>
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<span class="kw1">template</span><span class="sy1"><</span>__NotSameAs<span class="sy1"><</span>subrange<span class="sy1">></span> PairLike<span class="sy1">></span>
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requires __PairLikeConvertibleTo<span class="sy1"><</span>PairLike, I, S<span class="sy1">></span>
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<span class="kw4">constexpr</span> subrange<span class="br0">(</span>PairLike<span class="sy3">&&</span> r<span class="br0">)</span> requires <span class="br0">(</span><span class="sy3">!</span>StoreSize<span class="br0">)</span>
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<span class="sy4">:</span> subrange<span class="br0">{</span>std<span class="sy4">::</span><span class="me2">get</span><span class="sy1"><</span><span class="nu0">0</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>PairLike<span class="sy1">></span><span class="br0">(</span>r<span class="br0">)</span><span class="br0">)</span>,
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std<span class="sy4">::</span><span class="me2">get</span><span class="sy1"><</span><span class="nu0">1</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>PairLike<span class="sy1">></span><span class="br0">(</span>r<span class="br0">)</span><span class="br0">)</span><span class="br0">}</span>
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<span class="br0">{</span><span class="br0">}</span>
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<span class="kw1">template</span><span class="sy1"><</span>__PairLikeConvertibleTo<span class="sy1"><</span>I, S<span class="sy1">></span> PairLike<span class="sy1">></span>
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<span class="kw4">constexpr</span> subrange<span class="br0">(</span>PairLike<span class="sy3">&&</span> r, iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> n<span class="br0">)</span>
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requires <span class="br0">(</span>K <span class="sy1">==</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span><span class="br0">)</span>
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<span class="sy4">:</span> subrange<span class="br0">{</span>std<span class="sy4">::</span><span class="me2">get</span><span class="sy1"><</span><span class="nu0">0</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>PairLike<span class="sy1">></span><span class="br0">(</span>r<span class="br0">)</span><span class="br0">)</span>,
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std<span class="sy4">::</span><span class="me2">get</span><span class="sy1"><</span><span class="nu0">1</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>PairLike<span class="sy1">></span><span class="br0">(</span>r<span class="br0">)</span><span class="br0">)</span>, n<span class="br0">}</span>
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<span class="br0">{</span><span class="br0">}</span>
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<span class="kw1">template</span><span class="sy1"><</span>__NotSameAs<span class="sy1"><</span>subrange<span class="sy1">></span> PairLike<span class="sy1">></span>
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requires __PairLikeConvertibleFrom<span class="sy1"><</span>PairLike, <span class="kw4">const</span> I<span class="sy3">&</span>, <span class="kw4">const</span> S<span class="sy3">&</span><span class="sy1">></span>
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<span class="kw4">constexpr</span> operator PairLike<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> I begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> S end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw4">bool</span> empty<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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requires <span class="br0">(</span>K <span class="sy1">==</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">constexpr</span> subrange next<span class="br0">(</span>iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> n <span class="sy1">=</span> <span class="nu0">1</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">constexpr</span> subrange prev<span class="br0">(</span>iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> n <span class="sy1">=</span> <span class="nu0">1</span><span class="br0">)</span> <span class="kw4">const</span>
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requires BidirectionalIterator<span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> subrange<span class="sy3">&</span> advance<span class="br0">(</span>iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span> n<span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> I begin<span class="br0">(</span>subrange<span class="sy3">&&</span> r<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> r.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> S end<span class="br0">(</span>subrange<span class="sy3">&&</span> r<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> r.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>Iterator I, Sentinel<span class="sy1"><</span>I<span class="sy1">></span> S<span class="sy1">></span>
|
|
subrange<span class="br0">(</span>I, S, iter_difference_t<span class="sy1"><</span>I<span class="sy1">></span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> subrange<span class="sy1"><</span>I, S, subrange_kind<span class="sy4">::</span><span class="me2">sized</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>__IteratorSentinelPair P<span class="sy1">></span>
|
|
subrange<span class="br0">(</span>P<span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> subrange<span class="sy1"><</span>tuple_element_t<span class="sy1"><</span><span class="nu0">0</span>, P<span class="sy1">></span>, tuple_element_t<span class="sy1"><</span><span class="nu0">1</span>, P<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>__IteratorSentinelPair P<span class="sy1">></span>
|
|
subrange<span class="br0">(</span>P, iter_difference_t<span class="sy1"><</span>tuple_element_t<span class="sy1"><</span><span class="nu0">0</span>, P<span class="sy1">>></span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span>
|
|
subrange<span class="sy1"><</span>tuple_element_t<span class="sy1"><</span><span class="nu0">0</span>, P<span class="sy1">></span>, tuple_element_t<span class="sy1"><</span><span class="nu0">1</span>, P<span class="sy1">></span>, subrange_kind<span class="sy4">::</span><span class="me2">sized</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>__ForwardingRange R<span class="sy1">></span>
|
|
subrange<span class="br0">(</span>R<span class="sy3">&&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span>
|
|
subrange<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>R<span class="sy1">></span>,
|
|
<span class="br0">(</span>SizedRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">||</span> SizedSentinel<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>R<span class="sy1">></span>, iterator_t<span class="sy1"><</span>R<span class="sy1">>></span><span class="br0">)</span>
|
|
<span class="sy4">?</span> subrange_kind<span class="sy4">::</span><span class="me2">sized</span> <span class="sy4">:</span> subrange_kind<span class="sy4">::</span><span class="me2">unsized</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>__ForwardingRange R<span class="sy1">></span>
|
|
subrange<span class="br0">(</span>R<span class="sy3">&&</span>, iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>></span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span>
|
|
subrange<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>R<span class="sy1">></span>, subrange_kind<span class="sy4">::</span><span class="me2">sized</span><span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>size_t N, <span class="kw1">class</span> I, <span class="kw1">class</span> S, subrange_kind K<span class="sy1">></span>
|
|
requires <span class="br0">(</span>N <span class="sy1"><</span> <span class="nu0">2</span><span class="br0">)</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> get<span class="br0">(</span><span class="kw4">const</span> subrange<span class="sy1"><</span>I, S, K<span class="sy1">></span><span class="sy3">&</span> r<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw1">namespace</span> std <span class="br0">{</span>
|
|
<span class="kw1">using</span> ranges<span class="sy4">::</span><span class="me2">get</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB_std::ranges::dangling">类 <span class="t-lc">std::ranges::dangling</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">struct</span> dangling <span class="br0">{</span>
|
|
<span class="kw4">constexpr</span> dangling<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span>... <span class="me1">Args</span><span class="sy1">></span>
|
|
<span class="kw4">constexpr</span> dangling<span class="br0">(</span>Args<span class="sy3">&&</span>...<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::empty_view">类模板 <span class="t-lc">std::ranges::empty_view</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span>
|
|
requires is_object_v<span class="sy1"><</span>T<span class="sy1">></span>
|
|
<span class="kw1">class</span> empty_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>empty_view<span class="sy1"><</span>T<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> T<span class="sy2">*</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> nullptr<span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> T<span class="sy2">*</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> nullptr<span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> T<span class="sy2">*</span> data<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> nullptr<span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> ptrdiff_t size<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> empty<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="kw2">true</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> T<span class="sy2">*</span> begin<span class="br0">(</span>empty_view<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> nullptr<span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> T<span class="sy2">*</span> end<span class="br0">(</span>empty_view<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> nullptr<span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::empty_view_2">类模板 <span class="t-lc">std::ranges::empty_view</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>CopyConstructible T<span class="sy1">></span>
|
|
requires is_object_v<span class="sy1"><</span>T<span class="sy1">></span>
|
|
<span class="kw1">class</span> single_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>single_view<span class="sy1"><</span>T<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
semiregular_box<span class="sy1"><</span>T<span class="sy1">></span> value_<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
single_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> single_view<span class="br0">(</span><span class="kw4">const</span> T<span class="sy3">&</span> t<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> single_view<span class="br0">(</span>T<span class="sy3">&&</span> t<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span>... <span class="me1">Args</span><span class="sy1">></span>
|
|
requires Constructible<span class="sy1"><</span>T, Args...<span class="sy1">></span>
|
|
<span class="kw4">constexpr</span> single_view<span class="br0">(</span>in_place_t, Args<span class="sy3">&&</span>... <span class="me1">args</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> T<span class="sy2">*</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">const</span> T<span class="sy2">*</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> T<span class="sy2">*</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">const</span> T<span class="sy2">*</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">constexpr</span> ptrdiff_t size<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> T<span class="sy2">*</span> data<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">const</span> T<span class="sy2">*</span> data<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::iota_view">类模板 <span class="t-lc">std::ranges::iota_view</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> I<span class="sy1">></span>
|
|
concept _Decrementable <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> I<span class="sy1">></span>
|
|
concept _Advanceable <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>WeaklyIncrementable W, Semiregular Bound <span class="sy1">=</span> unreachable_sentinel_t<span class="sy1">></span>
|
|
requires __WeaklyEqualityComparableWith<span class="sy1"><</span>W, Bound<span class="sy1">></span>
|
|
<span class="kw1">class</span> iota_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>iota_view<span class="sy1"><</span>W, Bound<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="co1">// 类 iota_­view​::​iterator</span>
|
|
<span class="kw1">struct</span> iterator<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="co1">// 类 iota_­view​::​sentinel</span>
|
|
<span class="kw1">struct</span> sentinel<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
W value_ <span class="sy1">=</span> W<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
Bound bound_ <span class="sy1">=</span> Bound<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
iota_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> iota_view<span class="br0">(</span>W value<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> iota_view<span class="br0">(</span>type_identity_t<span class="sy1"><</span>W<span class="sy1">></span> value,
|
|
type_identity_t<span class="sy1"><</span>Bound<span class="sy1">></span> bound<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> iterator begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> sentinel end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> iterator end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires Same<span class="sy1"><</span>W, Bound<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires <span class="br0">(</span>Same<span class="sy1"><</span>W, Bound<span class="sy1">></span> <span class="sy3">&&</span> _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="br0">)</span> <span class="sy3">||</span>
|
|
<span class="br0">(</span>Integral<span class="sy1"><</span>W<span class="sy1">></span> <span class="sy3">&&</span> Integral<span class="sy1"><</span>Bound<span class="sy1">></span><span class="br0">)</span> <span class="sy3">||</span>
|
|
SizedSentinel<span class="sy1"><</span>Bound, W<span class="sy1">></span>
|
|
<span class="br0">{</span> <span class="kw1">return</span> bound_ <span class="sy2">-</span> value_<span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> W, <span class="kw1">class</span> Bound<span class="sy1">></span>
|
|
requires <span class="br0">(</span><span class="sy3">!</span>Integral<span class="sy1"><</span>W<span class="sy1">></span> <span class="sy3">||</span> <span class="sy3">!</span>Integral<span class="sy1"><</span>Bound<span class="sy1">></span> <span class="sy3">||</span> is_signed_v<span class="sy1"><</span>W<span class="sy1">></span> <span class="sy1">==</span> is_signed_v<span class="sy1"><</span>Bound<span class="sy1">></span><span class="br0">)</span>
|
|
iota_view<span class="br0">(</span>W, Bound<span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> iota_view<span class="sy1"><</span>W, Bound<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB_std::ranges::iota_view::iterator">类 <span class="t-lc">std::ranges::iota_view::iterator</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> W, <span class="kw1">class</span> Bound<span class="sy1">></span>
|
|
<span class="kw1">struct</span> iota_view<span class="sy1"><</span>W, Bound<span class="sy1">></span><span class="sy4">::</span><span class="me2">iterator</span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
W value_ <span class="sy1">=</span> W<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> iterator_category <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> value_type <span class="sy1">=</span> W<span class="sy4">;</span>
|
|
<span class="kw1">using</span> difference_type <span class="sy1">=</span> iter_difference_t<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
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|
iterator<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> iterator<span class="br0">(</span>W value<span class="br0">)</span><span class="sy4">;</span>
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|
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|
<span class="kw4">constexpr</span> W operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="br0">(</span>is_nothrow_copy_constructible_v<span class="sy1"><</span>W<span class="sy1">></span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> <span class="kw4">void</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> requires Incrementable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">--</span><span class="br0">(</span><span class="br0">)</span> requires _Decrementable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator operator<span class="sy2">--</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> requires _Decrementable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
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|
<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span>difference_type n<span class="br0">)</span>
|
|
requires _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span>difference_type n<span class="br0">)</span>
|
|
requires _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> W operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>difference_type n<span class="br0">)</span> <span class="kw4">const</span>
|
|
requires _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires EqualityComparable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires EqualityComparable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
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|
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires StrictTotallyOrdered<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">></span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires StrictTotallyOrdered<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires StrictTotallyOrdered<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">>=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires StrictTotallyOrdered<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iterator operator<span class="sy2">+</span><span class="br0">(</span>iterator i, difference_type n<span class="br0">)</span>
|
|
requires _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iterator operator<span class="sy2">+</span><span class="br0">(</span>difference_type n, iterator i<span class="br0">)</span>
|
|
requires _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iterator operator<span class="sy2">-</span><span class="br0">(</span>iterator i, difference_type n<span class="br0">)</span>
|
|
requires _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> difference_type operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires _Advanceable<span class="sy1"><</span>W<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
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|
<h4><span class="mw-headline" id=".E7.B1.BB_std::ranges::iota_view::sentinel">类 <span class="t-lc">std::ranges::iota_view::sentinel</span></span></h4>
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|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> W, <span class="kw1">class</span> Bound<span class="sy1">></span>
|
|
<span class="kw1">struct</span> iota_view<span class="sy1"><</span>W, Bound<span class="sy1">></span><span class="sy4">::</span><span class="me2">sentinel</span> <span class="br0">{</span>
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|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
Bound bound_ <span class="sy1">=</span> Bound<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
sentinel<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> sentinel<span class="br0">(</span>Bound bound<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::ref_view">类模板 <span class="t-lc">std::ranges::ref_view</span></span></h4>
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|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>Range R<span class="sy1">></span>
|
|
requires is_object_v<span class="sy1"><</span>R<span class="sy1">></span>
|
|
<span class="kw1">class</span> ref_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>ref_view<span class="sy1"><</span>R<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
R<span class="sy2">*</span> r_ <span class="sy1">=</span> nullptr<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw4">constexpr</span> ref_view<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>__NotSameAs<span class="sy1"><</span>ref_view<span class="sy1">></span> T<span class="sy1">></span>
|
|
requires <span class="coMULTI">/* 见定义 */</span>
|
|
<span class="kw4">constexpr</span> ref_view<span class="br0">(</span>T<span class="sy3">&&</span> t<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> R<span class="sy3">&</span> base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="sy2">*</span>r_<span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> iterator_t<span class="sy1"><</span>R<span class="sy1">></span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span><span class="sy2">*</span>r_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="kw4">constexpr</span> sentinel_t<span class="sy1"><</span>R<span class="sy1">></span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span><span class="sy2">*</span>r_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">bool</span> empty<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires requires <span class="br0">{</span> ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span><span class="sy2">*</span>r_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="br0">{</span> <span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">empty</span><span class="br0">(</span><span class="sy2">*</span>r_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires SizedRange<span class="sy1"><</span>R<span class="sy1">></span>
|
|
<span class="br0">{</span> <span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span><span class="sy2">*</span>r_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> data<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires ContiguousRange<span class="sy1"><</span>R<span class="sy1">></span>
|
|
<span class="br0">{</span> <span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">data</span><span class="br0">(</span><span class="sy2">*</span>r_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iterator_t<span class="sy1"><</span>R<span class="sy1">></span> begin<span class="br0">(</span>ref_view r<span class="br0">)</span>
|
|
<span class="br0">{</span> <span class="kw1">return</span> r.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> sentinel_t<span class="sy1"><</span>R<span class="sy1">></span> end<span class="br0">(</span>ref_view r<span class="br0">)</span>
|
|
<span class="br0">{</span> <span class="kw1">return</span> r.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
ref_view<span class="br0">(</span>R<span class="sy3">&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> ref_view<span class="sy1"><</span>R<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::filter_view">类模板 <span class="t-lc">std::ranges::filter_view</span></span></h4>
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|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange V, IndirectUnaryPredicate<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> Pred<span class="sy1">></span>
|
|
requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> is_object_v<span class="sy1"><</span>Pred<span class="sy1">></span>
|
|
<span class="kw1">class</span> filter_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>filter_view<span class="sy1"><</span>V, Pred<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
V base_ <span class="sy1">=</span> V<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
semiregular_box<span class="sy1"><</span>Pred<span class="sy1">></span> pred_<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="co1">// 类 filter_view​::​iterator</span>
|
|
<span class="kw1">class</span> iterator<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="co1">// 类 filter_view​::​sentinel</span>
|
|
<span class="kw1">class</span> sentinel<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
filter_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> filter_view<span class="br0">(</span>V base, Pred pred<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange R<span class="sy1">></span>
|
|
requires ViewableRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span> Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span>
|
|
<span class="kw4">constexpr</span> filter_view<span class="br0">(</span>R<span class="sy3">&&</span> r, Pred pred<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> V base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> iterator begin<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>CommonRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> iterator<span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> sentinel<span class="br0">{</span><span class="sy2">*</span>this<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span> Pred<span class="sy1">></span>
|
|
filter_view<span class="br0">(</span>R<span class="sy3">&&</span>, Pred<span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> filter_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">></span>, Pred<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB_std::ranges::filter_view::iterator">类 <span class="t-lc">std::ranges::filter_view::iterator</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw1">class</span> filter_view<span class="sy1"><</span>V, Pred<span class="sy1">></span><span class="sy4">::</span><span class="me2">iterator</span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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iterator_t<span class="sy1"><</span>V<span class="sy1">></span> current_ <span class="sy1">=</span> iterator_t<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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filter_view<span class="sy2">*</span> parent_ <span class="sy1">=</span> nullptr<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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<span class="kw1">using</span> iterator_concept <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> iterator_category <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> value_type <span class="sy1">=</span> iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw1">using</span> difference_type <span class="sy1">=</span> iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="sy4">;</span>
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iterator<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="br0">(</span>filter_view<span class="sy3">&</span> parent, iterator_t<span class="sy1"><</span>V<span class="sy1">></span> current<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator_t<span class="sy1"><</span>V<span class="sy1">></span> base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator_t<span class="sy1"><</span>V<span class="sy1">></span> operator<span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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requires has<span class="sy2">-</span>arrow<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw4">void</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> requires ForwardRange<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">--</span><span class="br0">(</span><span class="br0">)</span> requires BidirectionalRange<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator operator<span class="sy2">--</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> requires BidirectionalRange<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
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requires EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
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requires EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> iter_rvalue_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> iter_move<span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> i<span class="br0">)</span>
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<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>i.<span class="me1">current_</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">void</span> iter_swap<span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
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<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span>x.<span class="me1">current_</span>, y.<span class="me1">current_</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
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requires IndirectlySwappable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB_std::ranges::filter_view::sentinel">类 <span class="t-lc">std::ranges::filter_view::sentinel</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw1">class</span> filter_view<span class="sy1"><</span>V, Pred<span class="sy1">></span><span class="sy4">::</span><span class="me2">sentinel</span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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sentinel_t<span class="sy1"><</span>V<span class="sy1">></span> end_ <span class="sy1">=</span> sentinel_t<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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sentinel<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span> sentinel<span class="br0">(</span>filter_view<span class="sy3">&</span> parent<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> sentinel_t<span class="sy1"><</span>V<span class="sy1">></span> base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::transform_view">类模板 <span class="t-lc">std::ranges::transform_view</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span>InputRange V, CopyConstructible F<span class="sy1">></span>
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requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> is_object_v<span class="sy1"><</span>F<span class="sy1">></span> <span class="sy3">&&</span>
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RegularInvocable<span class="sy1"><</span>F<span class="sy3">&</span>, iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span>
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<span class="kw1">class</span> transform_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>transform_view<span class="sy1"><</span>V, F<span class="sy1">>></span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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<span class="co1">// 类模板 transform_view​::​iterator</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span><span class="sy1">></span> <span class="kw1">struct</span> iterator<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="co1">// 类模板 transform_view​::​sentinel</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span><span class="sy1">></span> <span class="kw1">struct</span> sentinel<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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V base_ <span class="sy1">=</span> V<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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semiregular_box<span class="sy1"><</span>F<span class="sy1">></span> fun_<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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transform_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> transform_view<span class="br0">(</span>V base, F fun<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>InputRange R<span class="sy1">></span>
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requires ViewableRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span> Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span>
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<span class="kw4">constexpr</span> transform_view<span class="br0">(</span>R<span class="sy3">&&</span> r, F fun<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> V base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span> begin<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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requires Range<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span>
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RegularInvocable<span class="sy1"><</span><span class="kw4">const</span> F<span class="sy3">&</span>, iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> sentinel<span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span> end<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span> end<span class="br0">(</span><span class="br0">)</span> requires CommonRange<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> sentinel<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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requires Range<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span>
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RegularInvocable<span class="sy1"><</span><span class="kw4">const</span> F<span class="sy3">&</span>, iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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requires CommonRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span>
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RegularInvocable<span class="sy1"><</span><span class="kw4">const</span> F<span class="sy3">&</span>, iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> requires SizedRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="br0">{</span> <span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span>
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<span class="br0">{</span> <span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span> F<span class="sy1">></span>
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transform_view<span class="br0">(</span>R<span class="sy3">&&</span>, F<span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> transform_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">></span>, F<span class="sy1">></span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::transform_view::iterator">类模板 <span class="t-lc">std::ranges::transform_view::iterator</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V, <span class="kw1">class</span> F<span class="sy1">></span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
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<span class="kw1">class</span> transform_view<span class="sy1"><</span>V, F<span class="sy1">></span><span class="sy4">::</span><span class="me2">iterator</span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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<span class="kw1">using</span> Parent <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> transform_view, transform_view<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">using</span> Base <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> V, V<span class="sy1">></span><span class="sy4">;</span>
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iterator_t<span class="sy1"><</span>Base<span class="sy1">></span> current_ <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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iterator_t<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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Parent<span class="sy2">*</span> parent_ <span class="sy1">=</span> nullptr<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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<span class="kw1">using</span> iterator_concept <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> iterator_category <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> value_type <span class="sy1">=</span>
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remove_cvref_t<span class="sy1"><</span>invoke_result_t<span class="sy1"><</span>F<span class="sy3">&</span>, iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>>></span><span class="sy4">;</span>
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<span class="kw1">using</span> difference_type <span class="sy1">=</span> iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
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|
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|
iterator<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator<span class="br0">(</span>Parent<span class="sy3">&</span> parent, iterator_t<span class="sy1"><</span>Base<span class="sy1">></span> current<span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator<span class="br0">(</span>iterator<span class="sy1"><</span><span class="sy3">!</span>Const<span class="sy1">></span> i<span class="br0">)</span>
|
|
requires Const <span class="sy3">&&</span> ConvertibleTo<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">></span>, iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator_t<span class="sy1"><</span>Base<span class="sy1">></span> base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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<span class="br0">{</span> <span class="kw1">return</span> invoke<span class="br0">(</span><span class="sy2">*</span>parent_<span class="sy2">-</span><span class="sy1">></span>fun_, <span class="sy2">*</span>current_<span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> <span class="kw4">void</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> requires ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
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|
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">--</span><span class="br0">(</span><span class="br0">)</span> requires BidirectionalRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator operator<span class="sy2">--</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> requires BidirectionalRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
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|
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span>difference_type n<span class="br0">)</span>
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|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span>difference_type n<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>difference_type n<span class="br0">)</span> <span class="kw4">const</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span>
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|
<span class="br0">{</span> <span class="kw1">return</span> invoke<span class="br0">(</span><span class="sy2">*</span>parent_<span class="sy2">-</span><span class="sy1">></span>fun_, current_<span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span>
|
|
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
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|
requires EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
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|
requires EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">></span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">>=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iterator operator<span class="sy2">+</span><span class="br0">(</span>iterator i, difference_type n<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iterator operator<span class="sy2">+</span><span class="br0">(</span>difference_type n, iterator i<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iterator operator<span class="sy2">-</span><span class="br0">(</span>iterator i, difference_type n<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> difference_type operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires RandomAccessRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> iter_move<span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> i<span class="br0">)</span>
|
|
<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>invoke<span class="br0">(</span><span class="sy2">*</span>i.<span class="me1">parent_</span><span class="sy2">-</span><span class="sy1">></span>fun_, <span class="sy2">*</span>i.<span class="me1">current_</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
|
|
<span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>is_lvalue_reference_v<span class="sy1"><</span>decltype<span class="br0">(</span><span class="sy2">*</span>i<span class="br0">)</span><span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span><span class="sy2">*</span>i<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> <span class="sy2">*</span>i<span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">void</span> iter_swap<span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span>x.<span class="me1">current_</span>, y.<span class="me1">current_</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
|
|
requires IndirectlySwappable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
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|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::transform_view::sentinel">类模板 <span class="t-lc">std::ranges::transform_view::sentinel</span></span></h4>
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|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V, <span class="kw1">class</span> F<span class="sy1">></span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">class</span> transform_view<span class="sy1"><</span>V, F<span class="sy1">></span><span class="sy4">::</span><span class="me2">sentinel</span> <span class="br0">{</span>
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|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> Parent <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> transform_view, transform_view<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> Base <span class="sy1">=</span> conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> V, V<span class="sy1">></span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span> end_ <span class="sy1">=</span> sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
sentinel<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> sentinel<span class="br0">(</span>sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span> end<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> sentinel<span class="br0">(</span>sentinel<span class="sy1"><</span><span class="sy3">!</span>Const<span class="sy1">></span> i<span class="br0">)</span>
|
|
requires Const <span class="sy3">&&</span> ConvertibleTo<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>V<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span> base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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|
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|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span>
|
|
operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires SizedSentinel<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span>, iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span>
|
|
operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> y, <span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> x<span class="br0">)</span>
|
|
requires SizedSentinel<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span>, iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::take_view">类模板 <span class="t-lc">std::ranges::take_view</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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|
<span class="kw1">template</span><span class="sy1"><</span>View V<span class="sy1">></span>
|
|
<span class="kw1">class</span> take_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>take_view<span class="sy1"><</span>V<span class="sy1">>></span> <span class="br0">{</span>
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|
<span class="kw1">private</span><span class="sy4">:</span>
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|
V base_ <span class="sy1">=</span> V<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> count_ <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="co1">// 类模板 take_­view​::​sentinel</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span><span class="sy1">></span> <span class="kw1">struct</span> sentinel<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
take_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> take_view<span class="br0">(</span>V base, iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> count<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>ViewableRange R<span class="sy1">></span>
|
|
requires Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span>
|
|
<span class="kw4">constexpr</span> take_view<span class="br0">(</span>R<span class="sy3">&&</span> r, iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> count<span class="br0">)</span><span class="sy4">;</span>
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|
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|
<span class="kw4">constexpr</span> V base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
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|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> requires <span class="br0">(</span><span class="sy3">!</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
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|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>SizedRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> counted_iterator<span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span>, size<span class="br0">(</span><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span> <span class="kw1">else</span>
|
|
<span class="kw1">return</span> counted_iterator<span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span>, count_<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires Range<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> counted_iterator<span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span>, size<span class="br0">(</span><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span> <span class="kw1">else</span>
|
|
<span class="kw1">return</span> counted_iterator<span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span>, count_<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> requires <span class="br0">(</span><span class="sy3">!</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>SizedRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span> <span class="sy2">+</span> size<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> default_sentinel<span class="sy4">;</span>
|
|
<span class="br0">}</span> <span class="kw1">else</span>
|
|
<span class="kw1">return</span> sentinel<span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span><span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires Range<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span> <span class="sy2">+</span> size<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> default_sentinel<span class="sy4">;</span>
|
|
<span class="br0">}</span> <span class="kw1">else</span>
|
|
<span class="kw1">return</span> sentinel<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span><span class="br0">{</span>ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> requires SizedRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw4">auto</span> n <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">min</span><span class="br0">(</span>n, <span class="kw1">static_cast</span><span class="sy1"><</span>decltype<span class="br0">(</span>n<span class="br0">)</span><span class="sy1">></span><span class="br0">(</span>count_<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw4">auto</span> n <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">min</span><span class="br0">(</span>n, <span class="kw1">static_cast</span><span class="sy1"><</span>decltype<span class="br0">(</span>n<span class="br0">)</span><span class="sy1">></span><span class="br0">(</span>count_<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>Range R<span class="sy1">></span>
|
|
take_view<span class="br0">(</span>R<span class="sy3">&&</span>, iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>></span><span class="br0">)</span>
|
|
<span class="sy2">-</span><span class="sy1">></span> take_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::take_view::sentinel">类模板 <span class="t-lc">std::ranges::take_view::sentinel</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V<span class="sy1">></span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">class</span> take_view<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">::</span><span class="me2">sentinel</span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> Base <span class="sy1">=</span> conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> V, V<span class="sy1">></span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">using</span> CI <span class="sy1">=</span> counted_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span> end_ <span class="sy1">=</span> sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
sentinel<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> sentinel<span class="br0">(</span>sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span> end<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> sentinel<span class="br0">(</span>sentinel<span class="sy1"><</span><span class="sy3">!</span>Const<span class="sy1">></span> s<span class="br0">)</span>
|
|
requires Const <span class="sy3">&&</span> ConvertibleTo<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>V<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span> base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> CI<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> CI<span class="sy3">&</span> y, <span class="kw4">const</span> sentinel<span class="sy3">&</span> x<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> CI<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> CI<span class="sy3">&</span> y, <span class="kw4">const</span> sentinel<span class="sy3">&</span> x<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::join_view">类模板 <span class="t-lc">std::ranges::join_view</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange V<span class="sy1">></span>
|
|
requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> InputRange<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span> <span class="sy3">&&</span>
|
|
<span class="br0">(</span>is_reference_v<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span> <span class="sy3">||</span>
|
|
View<span class="sy1"><</span>iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>>></span><span class="br0">)</span>
|
|
<span class="kw1">class</span> join_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>join_view<span class="sy1"><</span>V<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> InnerRng <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="co1">// 类模板 join_­view​::​iterator</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">struct</span> iterator<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="co1">// 类模板 join_­view​::​sentinel</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">struct</span> sentinel<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
V base_ <span class="sy1">=</span> V<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
all_view<span class="sy1"><</span>InnerRng<span class="sy1">></span> inner_ <span class="sy1">=</span> <span class="co1">// 仅用于阐释，</span>
|
|
all_view<span class="sy1"><</span>InnerRng<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅当 !is_reference_v<InnerRng> 时才存在</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
join_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> join_view<span class="br0">(</span>V base<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange R<span class="sy1">></span>
|
|
requires ViewableRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span> Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> join_view<span class="br0">(</span>R<span class="sy3">&&</span> r<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> iterator<span class="sy1"><</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">>></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires InputRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span>
|
|
is_reference_v<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> iterator<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>ForwardRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span>
|
|
is_reference_v<span class="sy1"><</span>InnerRng<span class="sy1">></span> <span class="sy3">&&</span> ForwardRange<span class="sy1"><</span>InnerRng<span class="sy1">></span> <span class="sy3">&&</span>
|
|
CommonRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> CommonRange<span class="sy1"><</span>InnerRng<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> iterator<span class="sy1"><</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">>></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> sentinel<span class="sy1"><</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">>></span><span class="br0">{</span><span class="sy2">*</span>this<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires InputRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span>
|
|
is_reference_v<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>ForwardRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span>
|
|
is_reference_v<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span> <span class="sy3">&&</span>
|
|
ForwardRange<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span> <span class="sy3">&&</span>
|
|
CommonRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span>
|
|
CommonRange<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>>></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> iterator<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
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|
<span class="kw1">return</span> sentinel<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span><span class="br0">{</span><span class="sy2">*</span>this<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
<span class="kw1">explicit</span> join_view<span class="br0">(</span>R<span class="sy3">&&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> join_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::join_view::iterator">类模板 <span class="t-lc">std::ranges::join_view::iterator</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V<span class="sy1">></span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
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<span class="kw1">struct</span> join_view<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">::</span><span class="me2">iterator</span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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<span class="kw1">using</span> Parent <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> join_view, join_view<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">using</span> Base <span class="sy1">=</span> conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> V, V<span class="sy1">></span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> ref_is_glvalue <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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is_reference_v<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>></span><span class="sy4">;</span>
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iterator_t<span class="sy1"><</span>Base<span class="sy1">></span> outer_ <span class="sy1">=</span> iterator_t<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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iterator_t<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>></span> inner_ <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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iterator_t<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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Parent<span class="sy2">*</span> parent_ <span class="sy1">=</span> nullptr<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw4">constexpr</span> <span class="kw4">void</span> satisfy<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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<span class="kw1">using</span> iterator_concept <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> iterator_category <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> value_type <span class="sy1">=</span>
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iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>>></span><span class="sy4">;</span>
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<span class="kw1">using</span> difference_type <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
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iterator<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator<span class="br0">(</span>Parent<span class="sy3">&</span> parent, iterator_t<span class="sy1"><</span>V<span class="sy1">></span> outer<span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator<span class="br0">(</span>iterator<span class="sy1"><</span><span class="sy3">!</span>Const<span class="sy1">></span> i<span class="br0">)</span>
|
|
requires Const <span class="sy3">&&</span>
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ConvertibleTo<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">></span>, iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span> <span class="sy3">&&</span>
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|
ConvertibleTo<span class="sy1"><</span>iterator_t<span class="sy1"><</span>InnerRng<span class="sy1">></span>,
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iterator_t<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="sy2">*</span>inner_<span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> iterator_t<span class="sy1"><</span>Base<span class="sy1">></span> operator<span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
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requires __HasArrow<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw4">void</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw4">constexpr</span> iterator operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span>
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requires ref_is_glvalue <span class="sy3">&&</span> ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span> <span class="sy3">&&</span>
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|
ForwardRange<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator<span class="sy3">&</span> operator<span class="sy2">--</span><span class="br0">(</span><span class="br0">)</span>
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requires ref_is_glvalue <span class="sy3">&&</span> BidirectionalRange<span class="sy1"><</span>Base<span class="sy1">></span> <span class="sy3">&&</span>
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|
BidirectionalRange<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator operator<span class="sy2">--</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span>
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requires ref_is_glvalue <span class="sy3">&&</span> BidirectionalRange<span class="sy1"><</span>Base<span class="sy1">></span> <span class="sy3">&&</span>
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BidirectionalRange<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>></span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires ref_is_glvalue <span class="sy3">&&</span> EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span> <span class="sy3">&&</span>
|
|
EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires ref_is_glvalue <span class="sy3">&&</span> EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span> <span class="sy3">&&</span>
|
|
EqualityComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>>>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> iter_move<span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> i<span class="br0">)</span>
|
|
<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>i.<span class="me1">inner_</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>i.<span class="me1">inner_</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">void</span> iter_swap<span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span>x.<span class="me1">inner_</span>, y.<span class="me1">inner_</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
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|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::join_view::sentinel">类模板 <span class="t-lc">std::ranges::join_view::sentinel</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V<span class="sy1">></span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">struct</span> join_view<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">::</span><span class="me2">sentinel</span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> Parent <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> join_view, join_view<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> Base <span class="sy1">=</span> conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> V, V<span class="sy1">></span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span> end_ <span class="sy1">=</span> sentinel_t<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
sentinel<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> sentinel<span class="br0">(</span>Parent<span class="sy3">&</span> parent<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> sentinel<span class="br0">(</span>sentinel<span class="sy1"><</span><span class="sy3">!</span>Const<span class="sy1">></span> s<span class="br0">)</span>
|
|
requires Const <span class="sy3">&&</span> ConvertibleTo<span class="sy1"><</span>sentinel_t<span class="sy1"><</span>V<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> x, <span class="kw4">const</span> sentinel<span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> sentinel<span class="sy3">&</span> x, <span class="kw4">const</span> iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::split_.C2.ADview">类模板 <span class="t-lc">std::ranges::split_­view</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">auto</span><span class="sy1">></span> <span class="kw1">struct</span> __require_constant<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
concept __TinyRange <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
SizedRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span>
|
|
requires <span class="br0">{</span> <span class="kw1">typename</span> __require_constant<span class="sy1"><</span>remove_reference_t<span class="sy1"><</span>R<span class="sy1">></span><span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy1">></span><span class="sy4">;</span> <span class="br0">}</span> <span class="sy3">&&</span>
|
|
<span class="br0">(</span>remove_reference_t<span class="sy1"><</span>R<span class="sy1">></span><span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><=</span> <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange V, ForwardRange Pattern<span class="sy1">></span>
|
|
requires View<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> View<span class="sy1"><</span>Pattern<span class="sy1">></span> <span class="sy3">&&</span>
|
|
IndirectlyComparable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">></span>, iterator_t<span class="sy1"><</span>Pattern<span class="sy1">></span>, ranges<span class="sy4">::</span><span class="me2">equal_to</span><span class="sy1">></span> <span class="sy3">&&</span>
|
|
<span class="br0">(</span>ForwardRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">||</span> __TinyRange<span class="sy1"><</span>Pattern<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">class</span> split_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>split_view<span class="sy1"><</span>V, Pattern<span class="sy1">>></span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
V base_ <span class="sy1">=</span> V<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
Pattern pattern_ <span class="sy1">=</span> Pattern<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
iterator_t<span class="sy1"><</span>V<span class="sy1">></span> current_ <span class="sy1">=</span> iterator_t<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释，</span>
|
|
<span class="co1">// 仅当 !ForwardRange<V> 时才存在</span>
|
|
<span class="co1">// 类模板 split_­view​::​outer_­iterator</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span><span class="sy1">></span> <span class="kw1">struct</span> outer_iterator<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="co1">// 类模板 split_­view​::​inner_­iterator</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span><span class="sy1">></span> <span class="kw1">struct</span> inner_iterator<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
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|
split_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> split_view<span class="br0">(</span>V base, Pattern pattern<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange R, ForwardRange P<span class="sy1">></span>
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|
requires Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span> <span class="sy3">&&</span>
|
|
Constructible<span class="sy1"><</span>Pattern, all_view<span class="sy1"><</span>P<span class="sy1">>></span>
|
|
<span class="kw4">constexpr</span> split_view<span class="br0">(</span>R<span class="sy3">&&</span> r, P<span class="sy3">&&</span> p<span class="br0">)</span><span class="sy4">;</span>
|
|
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|
<span class="kw1">template</span><span class="sy1"><</span>InputRange R<span class="sy1">></span>
|
|
requires Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span> <span class="sy3">&&</span>
|
|
Constructible<span class="sy1"><</span>Pattern, single_view<span class="sy1"><</span>iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>>>></span>
|
|
<span class="kw4">constexpr</span> split_view<span class="br0">(</span>R<span class="sy3">&&</span> r, iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>></span> e<span class="br0">)</span><span class="sy4">;</span>
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|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>ForwardRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> outer_iterator<span class="sy1"><</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">>></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span> <span class="br0">{</span>
|
|
current_ <span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">return</span> outer_iterator<span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span><span class="br0">{</span><span class="sy2">*</span>this<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
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|
<span class="br0">}</span>
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|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires ForwardRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> ForwardRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> outer_iterator<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
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|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> requires ForwardRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> CommonRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> outer_iterator<span class="sy1"><</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">>></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>ForwardRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> ForwardRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span> CommonRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="br0">)</span>
|
|
<span class="kw1">return</span> outer_iterator<span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span><span class="br0">{</span><span class="sy2">*</span>this, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span> default_sentinel<span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R, <span class="kw1">class</span> P<span class="sy1">></span>
|
|
split_view<span class="br0">(</span>R<span class="sy3">&&</span>, P<span class="sy3">&&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> split_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">></span>, all_view<span class="sy1"><</span>P<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">template</span><span class="sy1"><</span>InputRange R<span class="sy1">></span>
|
|
split_view<span class="br0">(</span>R<span class="sy3">&&</span>, iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>></span><span class="br0">)</span>
|
|
<span class="sy2">-</span><span class="sy1">></span> split_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">></span>, single_view<span class="sy1"><</span>iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>R<span class="sy1">>>>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::split_view::outer_iterator">类模板 <span class="t-lc">std::ranges::split_view::outer_iterator</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V, <span class="kw1">class</span> Pattern<span class="sy1">></span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">struct</span> split_view<span class="sy1"><</span>V, Pattern<span class="sy1">></span><span class="sy4">::</span><span class="me2">outer_iterator</span> <span class="br0">{</span>
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|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> Parent <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> split_view, split_view<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> Base <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
|
|
conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> V, V<span class="sy1">></span><span class="sy4">;</span>
|
|
Parent<span class="sy2">*</span> parent_ <span class="sy1">=</span> nullptr<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
iterator_t<span class="sy1"><</span>Base<span class="sy1">></span> current_ <span class="sy1">=</span> <span class="co1">// 仅用于阐释，</span>
|
|
iterator_t<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅当 V 构成 ForwardRange 时才存在</span>
|
|
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> iterator_concept <span class="sy1">=</span>
|
|
conditional_t<span class="sy1"><</span>ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span>, forward_iterator_tag, input_iterator_tag<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> iterator_category <span class="sy1">=</span> input_iterator_tag<span class="sy4">;</span>
|
|
<span class="kw1">struct</span> value_type<span class="sy4">;</span>
|
|
<span class="kw1">using</span> difference_type <span class="sy1">=</span> iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
outer_iterator<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> outer_iterator<span class="br0">(</span>Parent<span class="sy3">&</span> parent<span class="br0">)</span>
|
|
requires <span class="br0">(</span><span class="sy3">!</span>ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> outer_iterator<span class="br0">(</span>Parent<span class="sy3">&</span> parent, iterator_t<span class="sy1"><</span>Base<span class="sy1">></span> current<span class="br0">)</span>
|
|
requires ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> outer_iterator<span class="br0">(</span>outer_iterator<span class="sy1"><</span><span class="sy3">!</span>Const<span class="sy1">></span> i<span class="br0">)</span>
|
|
requires Const <span class="sy3">&&</span> ConvertibleTo<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">></span>, iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> value_type operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> outer_iterator<span class="sy3">&</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="kw4">auto</span> tmp <span class="sy1">=</span> <span class="sy2">*</span>this<span class="sy4">;</span>
|
|
<span class="sy2">++*</span>this<span class="sy4">;</span>
|
|
<span class="kw1">return</span> tmp<span class="sy4">;</span>
|
|
<span class="br0">}</span> <span class="kw1">else</span>
|
|
<span class="sy2">++*</span>this<span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> outer_iterator<span class="sy3">&</span> x, <span class="kw4">const</span> outer_iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> outer_iterator<span class="sy3">&</span> x, <span class="kw4">const</span> outer_iterator<span class="sy3">&</span> y<span class="br0">)</span>
|
|
requires ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> outer_iterator<span class="sy3">&</span> x, default_sentinel_t<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span>default_sentinel_t, <span class="kw4">const</span> outer_iterator<span class="sy3">&</span> x<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> outer_iterator<span class="sy3">&</span> x, default_sentinel_t y<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span>default_sentinel_t y, <span class="kw4">const</span> outer_iterator<span class="sy3">&</span> x<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB_std::ranges::split_view::outer_iterator::value_type">类 <span class="t-lc">std::ranges::split_view::outer_iterator::value_type</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V, <span class="kw1">class</span> Pattern<span class="sy1">></span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">struct</span> split_view<span class="sy1"><</span>V, Pattern<span class="sy1">></span><span class="sy4">::</span><span class="me2">outer_iterator</span><span class="sy1"><</span>Const<span class="sy1">></span><span class="sy4">::</span><span class="me2">value_type</span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
outer_iterator i_ <span class="sy1">=</span> outer_iterator<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
value_type<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> value_type<span class="br0">(</span>outer_iterator i<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> inner_iterator<span class="sy1"><</span>Const<span class="sy1">></span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> default_sentinel_t end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::split_view::inner_iterator">类模板 <span class="t-lc">std::ranges::split_view::inner_iterator</span></span></h4>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="cpp source-cpp">
|
|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> V, <span class="kw1">class</span> Pattern<span class="sy1">></span>
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw4">bool</span> Const<span class="sy1">></span>
|
|
<span class="kw1">struct</span> split_view<span class="sy1"><</span>V, Pattern<span class="sy1">></span><span class="sy4">::</span><span class="me2">inner_iterator</span> <span class="br0">{</span>
|
|
<span class="kw1">private</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> Base <span class="sy1">=</span>
|
|
conditional_t<span class="sy1"><</span>Const, <span class="kw4">const</span> V, V<span class="sy1">></span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
outer_iterator<span class="sy1"><</span>Const<span class="sy1">></span> i_ <span class="sy1">=</span> outer_iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw4">bool</span> incremented_ <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="kw1">using</span> iterator_concept <span class="sy1">=</span> <span class="kw1">typename</span> outer_iterator<span class="sy1"><</span>Const<span class="sy1">></span><span class="sy4">::</span><span class="me2">iterator_concept</span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> iterator_category <span class="sy1">=</span> <span class="coMULTI">/* 见定义 */</span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> value_type <span class="sy1">=</span> iter_value_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="kw1">using</span> difference_type <span class="sy1">=</span> iter_difference_t<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
|
|
inner_iterator<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> inner_iterator<span class="br0">(</span>outer_iterator<span class="sy1"><</span>Const<span class="sy1">></span> i<span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="sy2">*</span>i_.<span class="me1">current</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> inner_iterator<span class="sy3">&</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> operator<span class="sy2">++</span><span class="br0">(</span><span class="kw4">int</span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>ForwardRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw4">auto</span> tmp <span class="sy1">=</span> <span class="sy2">*</span>this<span class="sy4">;</span>
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<span class="sy2">++*</span>this<span class="sy4">;</span>
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<span class="kw1">return</span> tmp<span class="sy4">;</span>
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<span class="br0">}</span> <span class="kw1">else</span>
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<span class="sy2">++*</span>this<span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> inner_iterator<span class="sy3">&</span> x, <span class="kw4">const</span> inner_iterator<span class="sy3">&</span> y<span class="br0">)</span>
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requires ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> inner_iterator<span class="sy3">&</span> x, <span class="kw4">const</span> inner_iterator<span class="sy3">&</span> y<span class="br0">)</span>
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requires ForwardRange<span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> inner_iterator<span class="sy3">&</span> x, default_sentinel_t<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span>default_sentinel_t, <span class="kw4">const</span> inner_iterator<span class="sy3">&</span> x<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> inner_iterator<span class="sy3">&</span> x, default_sentinel_t y<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span>default_sentinel_t y, <span class="kw4">const</span> inner_iterator<span class="sy3">&</span> x<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> decltype<span class="br0">(</span><span class="kw4">auto</span><span class="br0">)</span> iter_move<span class="br0">(</span><span class="kw4">const</span> inner_iterator<span class="sy3">&</span> i<span class="br0">)</span>
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<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>i.<span class="me1">i_</span>.<span class="me1">current</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
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|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>i.<span class="me1">i_</span>.<span class="me1">current</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">void</span> iter_swap<span class="br0">(</span><span class="kw4">const</span> inner_iterator<span class="sy3">&</span> x, <span class="kw4">const</span> inner_iterator<span class="sy3">&</span> y<span class="br0">)</span>
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<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span>x.<span class="me1">i_</span>.<span class="me1">current</span>, y.<span class="me1">i_</span>.<span class="me1">current</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
|
|
requires IndirectlySwappable<span class="sy1"><</span>iterator_t<span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::common_view">类模板 <span class="t-lc">std::ranges::common_view</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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|
<span class="kw1">template</span><span class="sy1"><</span>View V<span class="sy1">></span>
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|
requires <span class="br0">(</span><span class="sy3">!</span>CommonRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
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<span class="kw1">class</span> common_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>common_view<span class="sy1"><</span>V<span class="sy1">>></span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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V base_ <span class="sy1">=</span> V<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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common_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span> common_view<span class="br0">(</span>V r<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>ViewableRange R<span class="sy1">></span>
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requires <span class="br0">(</span><span class="sy3">!</span>CommonRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span> Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span><span class="br0">)</span>
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|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> common_view<span class="br0">(</span>R<span class="sy3">&&</span> r<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> V base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> requires SizedRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="br0">{</span>
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|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
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<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
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|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> SizedRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
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|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">else</span>
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|
<span class="kw1">return</span> common_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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|
<span class="br0">}</span>
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|
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires Range<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
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|
<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span> SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="br0">)</span>
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<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span>
|
|
common_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span>, sentinel_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>></span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span> SizedRange<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</span>
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<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span> <span class="sy2">+</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">else</span>
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<span class="kw1">return</span> common_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">></span>, sentinel_t<span class="sy1"><</span>V<span class="sy1">>></span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires Range<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
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<span class="kw1">if</span> <span class="kw4">constexpr</span> <span class="br0">(</span>RandomAccessRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span> SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="br0">)</span>
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<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>base_<span class="br0">)</span> <span class="sy2">+</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
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|
<span class="kw1">else</span>
|
|
<span class="kw1">return</span>
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|
common_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span>, sentinel_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>></span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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|
<span class="br0">}</span>
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|
<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
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common_view<span class="br0">(</span>R<span class="sy3">&&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> common_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">>></span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::ranges::reverse_view">类模板 <span class="t-lc">std::ranges::reverse_view</span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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|
<div class="cpp source-cpp">
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|
<pre class="de1"><span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">ranges</span> <span class="br0">{</span>
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|
<span class="kw1">template</span><span class="sy1"><</span>View V<span class="sy1">></span>
|
|
requires BidirectionalRange<span class="sy1"><</span>V<span class="sy1">></span>
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<span class="kw1">class</span> reverse_view <span class="sy4">:</span> <span class="kw1">public</span> view_interface<span class="sy1"><</span>reverse_view<span class="sy1"><</span>V<span class="sy1">>></span> <span class="br0">{</span>
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<span class="kw1">private</span><span class="sy4">:</span>
|
|
V base_ <span class="sy1">=</span> V<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
reverse_view<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span> reverse_view<span class="br0">(</span>V r<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>ViewableRange R<span class="sy1">></span>
|
|
requires BidirectionalRange<span class="sy1"><</span>R<span class="sy1">></span> <span class="sy3">&&</span> Constructible<span class="sy1"><</span>V, all_view<span class="sy1"><</span>R<span class="sy1">>></span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span> reverse_view<span class="br0">(</span>R<span class="sy3">&&</span> r<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> V base<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
|
|
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<span class="kw4">constexpr</span> reverse_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> begin<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> reverse_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> begin<span class="br0">(</span><span class="br0">)</span> requires CommonRange<span class="sy1"><</span>V<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> reverse_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>></span> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires CommonRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="sy4">;</span>
|
|
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|
<span class="kw4">constexpr</span> reverse_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span>V<span class="sy1">>></span> end<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw4">constexpr</span> reverse_iterator<span class="sy1"><</span>iterator_t<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>></span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span>
|
|
requires CommonRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> requires SizedRange<span class="sy1"><</span>V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="kw4">constexpr</span> <span class="kw4">auto</span> size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires SizedRange<span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="br0">{</span>
|
|
<span class="kw1">return</span> ranges<span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span>base_<span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="br0">}</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
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|
|
|
<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> R<span class="sy1">></span>
|
|
reverse_view<span class="br0">(</span>R<span class="sy3">&&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> reverse_view<span class="sy1"><</span>all_view<span class="sy1"><</span>R<span class="sy1">>></span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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