260 lines
23 KiB
HTML
260 lines
23 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 <span></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_span 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> <span></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-container.html">容器</a>库的一部分。</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=".E7.B1.BB">类</span></h3>
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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-container-span.html"><span class="t-lines"><span>span</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>对象的连续序列上的无所有权视图<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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<h3><span class="mw-headline" id=".E5.B8.B8.E9.87.8F">常量</span></h3>
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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-container-span-dynamic_extent.html"><span class="t-lines"><span>dynamic_extent</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><code>size_t</code> 类型常量,指明 <code>span</code> 拥有动态长度<br />
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<span class="t-mark">(常量)</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=".E5.87.BD.E6.95.B0">函数</span></h3>
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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-container-span-as_bytes.html"><span class="t-lines"><span>as_bytes</span><span>as_writable_bytes</span></span></a></div>
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</div>
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</td>
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<td>转换 <code>span</code> 为对其底层字节的视图<br />
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<span class="t-mark">(函数模板)</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=".E8.8C.83.E5.9B.B4.E8.AE.BF.E9.97.AE">范围访问</span></h5>
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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-iterator-begin.html"><span class="t-lines"><span>begin</span><span>cbegin</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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</div>
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</td>
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<td>返回指向容器或数组起始的迭代器<br />
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<span class="t-mark">(函数模板)</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-iterator-end.html"><span class="t-lines"><span>end</span><span>cend</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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</div>
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</td>
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<td>返回指向容器或数组结尾的迭代器<br />
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<span class="t-mark">(函数模板)</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-iterator-rbegin.html"><span class="t-lines"><span>rbegin</span><span>crbegin</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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</div>
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</td>
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<td>返回指向一个容器或数组的逆向迭代器<br />
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<span class="t-mark">(函数模板)</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-iterator-rend.html"><span class="t-lines"><span>rend</span><span>crend</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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</div>
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</td>
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<td>返回容器或数组的逆向尾迭代器<br />
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<span class="t-mark">(函数模板)</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-iterator-size.html"><span class="t-lines"><span>size</span><span>ssize</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span><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>返回容器或数组的大小<br />
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<span class="t-mark">(函数模板)</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-iterator-empty.html"><span class="t-lines"><span>empty</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</div>
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</td>
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<td>检查容器是否为空<br />
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<span class="t-mark">(函数模板)</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-iterator-data.html"><span class="t-lines"><span>data</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</div>
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</td>
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<td>获得指向底层数组的指针<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">概要</span></h3>
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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="br0">{</span>
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<span class="co1">// 常量</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> size_t dynamic_extent <span class="sy1">=</span> numeric_limits<span class="sy1"><</span>size_t<span class="sy1">></span><span class="sy4">::</span><span class="me2">max</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 类模板 span</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> ElementType, size_t Extent <span class="sy1">=</span> dynamic_extent<span class="sy1">></span>
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<span class="kw1">class</span> span<span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> ElementType, size_t Extent<span class="sy1">></span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> ranges<span class="sy4">::</span><span class="me2">enable_borrowed_range</span><span class="sy1"><</span>span<span class="sy1"><</span>ElementType, Extent<span class="sy1">>></span> <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
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<span class="co1">// 对象表示的视图</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> ElementType, size_t Extent<span class="sy1">></span>
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span<span class="sy1"><</span><span class="kw4">const</span> byte,
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Extent <span class="sy1">==</span> dynamic_extent <span class="sy4">?</span> dynamic_extent <span class="sy4">:</span> sizeof<span class="br0">(</span>ElementType<span class="br0">)</span> <span class="sy2">*</span> Extent<span class="sy1">></span>
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as_bytes<span class="br0">(</span>span<span class="sy1"><</span>ElementType, Extent<span class="sy1">></span> s<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> ElementType, size_t Extent<span class="sy1">></span>
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span<span class="sy1"><</span>byte, Extent <span class="sy1">==</span> dynamic_extent <span class="sy4">?</span> dynamic_extent <span class="sy4">:</span> sizeof<span class="br0">(</span>ElementType<span class="br0">)</span> <span class="sy2">*</span> Extent<span class="sy1">></span>
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as_writable_bytes<span class="br0">(</span>span<span class="sy1"><</span>ElementType, Extent<span class="sy1">></span> s<span class="br0">)</span> <span class="kw1">noexcept</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::span">类模板 <span class="t-lc">std::span</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="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> ElementType, size_t Extent <span class="sy1">=</span> dynamic_extent<span class="sy1">></span>
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<span class="kw1">class</span> span <span class="br0">{</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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<span class="co1">// 常量与类型</span>
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<span class="kw1">using</span> element_type <span class="sy1">=</span> ElementType<span class="sy4">;</span>
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<span class="kw1">using</span> value_type <span class="sy1">=</span> remove_cv_t<span class="sy1"><</span>ElementType<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">using</span> size_type <span class="sy1">=</span> size_t<span class="sy4">;</span>
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<span class="kw1">using</span> difference_type <span class="sy1">=</span> ptrdiff_t<span class="sy4">;</span>
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<span class="kw1">using</span> pointer <span class="sy1">=</span> element_type<span class="sy2">*</span><span class="sy4">;</span>
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<span class="kw1">using</span> const_pointer <span class="sy1">=</span> <span class="kw4">const</span> element_type<span class="sy2">*</span><span class="sy4">;</span>
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<span class="kw1">using</span> reference <span class="sy1">=</span> element_type<span class="sy3">&</span><span class="sy4">;</span>
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<span class="kw1">using</span> const_reference <span class="sy1">=</span> <span class="kw4">const</span> element_type<span class="sy3">&</span><span class="sy4">;</span>
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<span class="kw1">using</span> iterator <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span><span class="sy4">;</span>
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<span class="kw1">using</span> reverse_iterator <span class="sy1">=</span> <a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1"><</span>iterator<span class="sy1">></span><span class="sy4">;</span>
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<span class="kw4">static</span> <span class="kw4">constexpr</span> size_type extent <span class="sy1">=</span> Extent<span class="sy4">;</span>
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<span class="co1">// 构造函数、复制与赋值</span>
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<span class="kw4">constexpr</span> span<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> It<span class="sy1">></span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent<span class="br0">)</span> span<span class="br0">(</span>It first, size_type count<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> It, <span class="kw1">class</span> End<span class="sy1">></span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent<span class="br0">)</span> span<span class="br0">(</span>It first, End last<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>size_t N<span class="sy1">></span>
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<span class="kw4">constexpr</span> span<span class="br0">(</span>type_identity_t<span class="sy1"><</span>element_type<span class="sy1">></span> <span class="br0">(</span><span class="sy3">&</span>arr<span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T, size_t N<span class="sy1">></span>
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<span class="kw4">constexpr</span> span<span class="br0">(</span>array<span class="sy1"><</span>T, N<span class="sy1">></span><span class="sy3">&</span> arr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T, size_t N<span class="sy1">></span>
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<span class="kw4">constexpr</span> span<span class="br0">(</span><span class="kw4">const</span> array<span class="sy1"><</span>T, N<span class="sy1">></span><span class="sy3">&</span> arr<span class="br0">)</span> <span class="kw1">noexcept</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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<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span>extent <span class="sy3">!</span><span class="sy1">=</span> dynamic_extent<span class="br0">)</span> span<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> span<span class="br0">(</span><span class="kw4">const</span> span<span class="sy3">&</span> other<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> OtherElementType, size_t OtherExtent<span class="sy1">></span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span><span class="br0">(</span><span class="coMULTI">/* 见描述 */</span><span class="br0">)</span>
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span<span class="br0">(</span><span class="kw4">const</span> span<span class="sy1"><</span>OtherElementType, OtherExtent<span class="sy1">></span><span class="sy3">&</span> s<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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~span<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>
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<span class="kw4">constexpr</span> span<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> span<span class="sy3">&</span> other<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
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<span class="co1">// 子视图</span>
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<span class="kw1">template</span><span class="sy1"><</span>size_t Count<span class="sy1">></span>
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<span class="kw4">constexpr</span> span<span class="sy1"><</span>element_type, Count<span class="sy1">></span> first<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>size_t Count<span class="sy1">></span>
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<span class="kw4">constexpr</span> span<span class="sy1"><</span>element_type, Count<span class="sy1">></span> last<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span>size_t Offset, size_t Count <span class="sy1">=</span> dynamic_extent<span class="sy1">></span>
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<span class="kw4">constexpr</span> span<span class="sy1"><</span>element_type, <span class="coMULTI">/* see description */</span><span class="sy1">></span> subspan<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<span class="sy1"><</span>element_type, dynamic_extent<span class="sy1">></span> first<span class="br0">(</span>size_type count<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> span<span class="sy1"><</span>element_type, dynamic_extent<span class="sy1">></span> last<span class="br0">(</span>size_type count<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> span<span class="sy1"><</span>element_type, dynamic_extent<span class="sy1">></span> subspan<span class="br0">(</span>
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size_type offset, size_type count <span class="sy1">=</span> dynamic_extent<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="co1">// 观察器</span>
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<span class="kw4">constexpr</span> size_type size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> size_type size_bytes<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</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> <span class="kw4">bool</span> empty<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="co1">// 元素访问</span>
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<span class="kw4">constexpr</span> reference operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span>size_type idx<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> reference front<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> reference back<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> pointer data<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="co1">// 迭代器支持</span>
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<span class="kw4">constexpr</span> iterator begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> iterator end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> reverse_iterator rbegin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> reverse_iterator rend<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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pointer data_<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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size_type size_<span class="sy4">;</span> <span class="co1">// 仅用于阐释</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> It, <span class="kw1">class</span> EndOrSize<span class="sy1">></span>
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span<span class="br0">(</span>It, EndOrSize<span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> span<span class="sy1"><</span>remove_reference_t<span class="sy1"><</span>iter_reference_t<span class="sy1"><</span>It<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, size_t N<span class="sy1">></span>
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span<span class="br0">(</span>T <span class="br0">(</span><span class="sy3">&</span><span class="br0">)</span><span class="br0">[</span>N<span class="br0">]</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> span<span class="sy1"><</span>T, N<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, size_t N<span class="sy1">></span>
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span<span class="br0">(</span>array<span class="sy1"><</span>T, N<span class="sy1">></span><span class="sy3">&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> span<span class="sy1"><</span>T, N<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, size_t N<span class="sy1">></span>
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span<span class="br0">(</span><span class="kw4">const</span> array<span class="sy1"><</span>T, N<span class="sy1">></span><span class="sy3">&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> span<span class="sy1"><</span><span class="kw4">const</span> T, N<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> R<span class="sy1">></span>
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span<span class="br0">(</span>R<span class="sy3">&&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> span<span class="sy1"><</span>remove_reference_t<span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">range_reference_t</span><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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