444 lines
49 KiB
HTML
444 lines
49 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 <compare></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_compare 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> <compare></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-utility.html">语言支持</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=".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 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-utility-compare-three_way_comparable.html"><span class="t-lines"><span>three_way_comparable</span><span>three_way_comparable_with</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>指定运算符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1"><=></span></span></span> 在给定类型上产生一致的结果<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 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-utility-compare-partial_ordering.html"><span class="t-lines"><span>partial_ordering</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>三路比较的结果类型，支持所有 6 种运算符，不可替换，并允许不可比较的值<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-utility-compare-weak_ordering.html"><span class="t-lines"><span>weak_ordering</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>三路比较的结果类型，支持所有 6 种运算符且不可替换<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-utility-compare-strong_ordering.html"><span class="t-lines"><span>strong_ordering</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>三路比较的结果类型，支持所有 6 种运算符且可替换<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-utility-compare-common_comparison_category.html"><span class="t-lines"><span>common_comparison_category</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>给定的全部类型都能转换到的最强比较类别<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-utility-compare-compare_three_way_result.html"><span class="t-lines"><span>compare_three_way_result</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>获得三路比较运算符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1"><=></span></span></span> 在给定类型上的结果<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-utility-compare-compare_three_way.html"><span class="t-lines"><span>compare_three_way</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>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1"><=></span> y</span></span> 的函数对象<br />
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<span class="t-mark">(类)</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.AE.9A.E5.88.B6.E7.82.B9.E5.AF.B9.E8.B1.A1">定制点对象</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-utility-compare-strong_order.html"><span class="t-lines"><span>strong_order</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>进行三路比较并产生 <code>std::strong_ordering</code> 类型结果<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 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-utility-compare-weak_order.html"><span class="t-lines"><span>weak_order</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>进行三路比较并产生 <code>std::weak_ordering</code> 类型结果<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 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-utility-compare-partial_order.html"><span class="t-lines"><span>partial_order</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>进行三路比较并产生 <code>std::partial_ordering</code> 类型结果<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 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-utility-compare-compare_strong_order_fallback.html"><span class="t-lines"><span>compare_strong_order_fallback</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>进行三路比较并产生 <code>std::strong_ordering</code> 类型的结果，即使 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1"><=></span></span></span> 不可用<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 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-utility-compare-compare_weak_order_fallback.html"><span class="t-lines"><span>compare_weak_order_fallback</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>进行三路比较并产生 <code>std::weak_ordering</code> 类型的结果，即使 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1"><=></span></span></span> 不可用<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 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-utility-compare-compare_partial_order_fallback.html"><span class="t-lines"><span>compare_partial_order_fallback</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>进行三路比较并产生 <code>std::partial_ordering</code> 类型的结果，即使 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1"><=></span></span></span> 不可用<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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<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-utility-compare-named_comparison_functions.html"><span class="t-lines"><span>is_eq</span><span>is_neq</span><span>is_lt</span><span>is_lteq</span><span>is_gt</span><span>is_gteq</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>具名比较函数<br />
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<span class="t-mark">(函数)</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">// 比较类别类型</span>
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<span class="kw1">class</span> partial_ordering<span class="sy4">;</span>
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<span class="kw1">class</span> weak_ordering<span class="sy4">;</span>
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<span class="kw1">class</span> strong_ordering<span class="sy4">;</span>
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<span class="co1">// 具名比较函数</span>
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<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_eq <span class="br0">(</span>partial_ordering cmp<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> cmp <span class="sy1">==</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_neq <span class="br0">(</span>partial_ordering cmp<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> cmp <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_lt <span class="br0">(</span>partial_ordering cmp<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> cmp <span class="sy1"><</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_lteq<span class="br0">(</span>partial_ordering cmp<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> cmp <span class="sy1"><=</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_gt <span class="br0">(</span>partial_ordering cmp<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> cmp <span class="sy1">></span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="kw4">constexpr</span> <span class="kw4">bool</span> is_gteq<span class="br0">(</span>partial_ordering cmp<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="br0">{</span> <span class="kw1">return</span> cmp <span class="sy1">>=</span> <span class="nu0">0</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="co1">// 共用比较类别类型</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span>... <span class="me1">Ts</span><span class="sy1">></span>
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<span class="kw1">struct</span> common_comparison_category <span class="br0">{</span>
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<span class="kw1">using</span> type <span class="sy1">=</span> <span class="coMULTI">/* 见描述 */</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>... <span class="me1">Ts</span><span class="sy1">></span>
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<span class="kw1">using</span> common_comparison_category_t <span class="sy1">=</span> <span class="kw1">typename</span> common_comparison_category<span class="sy1"><</span>Ts...<span class="sy1">></span><span class="sy4">::</span><span class="me2">type</span><span class="sy4">;</span>
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<span class="co1">// 概念 three_way_comparable</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> Cat <span class="sy1">=</span> partial_ordering<span class="sy1">></span>
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concept three_way_comparable <span class="sy1">=</span> <span class="coMULTI">/* 见描述 */</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> Cat <span class="sy1">=</span> partial_ordering<span class="sy1">></span>
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concept three_way_comparable_with <span class="sy1">=</span> <span class="coMULTI">/* 见描述 */</span><span class="sy4">;</span>
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<span class="co1">// 三路比较的结果</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="sy1">=</span> T<span class="sy1">></span> <span class="kw1">struct</span> compare_three_way_result<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="sy1">=</span> T<span class="sy1">></span>
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<span class="kw1">using</span> compare_three_way_result_t <span class="sy1">=</span> <span class="kw1">typename</span> compare_three_way_result<span class="sy1"><</span>T, U<span class="sy1">></span><span class="sy4">::</span><span class="me2">type</span><span class="sy4">;</span>
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<span class="co1">// 类 compare_three_way</span>
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<span class="kw1">struct</span> compare_three_way<span class="sy4">;</span>
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<span class="co1">// 比较算法</span>
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<span class="kw1">inline</span> <span class="kw1">namespace</span> <span class="coMULTI">/* 未指明 */</span> <span class="br0">{</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> strong_order <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> weak_order <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> partial_order <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> compare_strong_order_fallback <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> compare_weak_order_fallback <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/* 未指明 */</span> compare_partial_order_fallback <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</span><span class="sy4">;</span>
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<span class="br0">}</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_three_way_comparable">概念 <a href="cpp-utility-compare-three_way_comparable.html"><code>three_way_comparable</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="br0">{</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> Cat<span class="sy1">></span>
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concept __ComparesAs <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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same_as<span class="sy1"><</span>common_comparison_category_t<span class="sy1"><</span>T, Cat<span class="sy1">></span>, Cat<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="kw1">class</span> U<span class="sy1">></span>
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concept __PartiallyOrderedWith <span class="sy1">=</span> <span class="co1">// 仅用于阐释</span>
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requires<span class="br0">(</span><span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> t, <span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span> u<span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="br0">{</span> t <span class="sy1"><</span> u <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<span class="sy4">;</span>
|
|
<span class="br0">{</span> t <span class="sy1">></span> u <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<span class="sy4">;</span>
|
|
<span class="br0">{</span> t <span class="sy1"><=</span> u <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<span class="sy4">;</span>
|
|
<span class="br0">{</span> t <span class="sy1">>=</span> u <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<span class="sy4">;</span>
|
|
<span class="br0">{</span> u <span class="sy1"><</span> t <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<span class="sy4">;</span>
|
|
<span class="br0">{</span> u <span class="sy1">></span> t <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<span class="sy4">;</span>
|
|
<span class="br0">{</span> u <span class="sy1"><=</span> t <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<span class="sy4">;</span>
|
|
<span class="br0">{</span> u <span class="sy1">>=</span> t <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> boolean<span class="sy2">-</span>testable<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> Cat <span class="sy1">=</span> partial_ordering<span class="sy1">></span>
|
|
concept three_way_comparable <span class="sy1">=</span>
|
|
__WeaklyEqualityComparableWith<span class="sy1"><</span>T, T<span class="sy1">></span> <span class="sy3">&&</span>
|
|
__PartiallyOrderedWith<span class="sy1"><</span>T, T<span class="sy1">></span> <span class="sy3">&&</span>
|
|
requires<span class="br0">(</span><span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> a, <span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> b<span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="br0">{</span> a <span class="sy1"><=></span> b <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> __ComparesAs<span class="sy1"><</span>Cat<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_three_way_comparable_with">概念 <a href="cpp-utility-compare-three_way_comparable.html"><code>three_way_comparable_with</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="br0">{</span>
|
|
<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> Cat <span class="sy1">=</span> partial_ordering<span class="sy1">></span>
|
|
concept three_way_comparable_with <span class="sy1">=</span>
|
|
__WeaklyEqualityComparableWith<span class="sy1"><</span>T, U<span class="sy1">></span> <span class="sy3">&&</span>
|
|
__PartiallyOrderedWith<span class="sy1"><</span>T, U<span class="sy1">></span> <span class="sy3">&&</span>
|
|
three_way_comparable<span class="sy1"><</span>T, Cat<span class="sy1">></span> <span class="sy3">&&</span>
|
|
three_way_comparable<span class="sy1"><</span>U, Cat<span class="sy1">></span> <span class="sy3">&&</span>
|
|
common_reference_with<span class="sy1"><</span><span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span>, <span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span><span class="sy1">></span> <span class="sy3">&&</span>
|
|
three_way_comparable<span class="sy1"><</span>
|
|
common_reference_t<span class="sy1"><</span>
|
|
<span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span>, <span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span><span class="sy1">></span>, Cat<span class="sy1">></span> <span class="sy3">&&</span>
|
|
requires<span class="br0">(</span><span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> t, <span class="kw4">const</span> remove_reference_t<span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span> u<span class="br0">)</span> <span class="br0">{</span>
|
|
<span class="br0">{</span> t <span class="sy1"><=></span> u <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> __ComparesAs<span class="sy1"><</span>Cat<span class="sy1">></span><span class="sy4">;</span>
|
|
<span class="br0">{</span> u <span class="sy1"><=></span> t <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> __ComparesAs<span class="sy1"><</span>Cat<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_std::partial_ordering">类 <span class="t-lc">std::partial_ordering</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="br0">{</span>
|
|
<span class="kw1">class</span> partial_ordering <span class="br0">{</span>
|
|
<span class="kw4">int</span> value<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw4">bool</span> is_ordered<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="co1">// 仅用于阐释的构造函数</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span>
|
|
partial_ordering<span class="br0">(</span>eq v<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span>
|
|
value<span class="br0">(</span><span class="kw4">int</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span>, is_ordered<span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span>
|
|
partial_ordering<span class="br0">(</span>ord v<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span>
|
|
value<span class="br0">(</span><span class="kw4">int</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span>, is_ordered<span class="br0">(</span><span class="kw2">true</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span>
|
|
partial_ordering<span class="br0">(</span>ncmp v<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span>
|
|
value<span class="br0">(</span><span class="kw4">int</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span>, is_ordered<span class="br0">(</span><span class="kw2">false</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="co1">// 合法值</span>
|
|
<span class="kw4">static</span> <span class="kw4">const</span> partial_ordering less<span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">const</span> partial_ordering equivalent<span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">const</span> partial_ordering greater<span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">const</span> partial_ordering unordered<span class="sy4">;</span>
|
|
|
|
<span class="co1">// 比较</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>partial_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>partial_ordering v, partial_ordering w<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">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><</span> <span class="br0">(</span>partial_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>partial_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>partial_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>partial_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, partial_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, partial_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, partial_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, partial_ordering v<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> partial_ordering
|
|
operator<span class="sy1"><=></span><span class="br0">(</span>partial_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> partial_ordering
|
|
operator<span class="sy1"><=></span><span class="br0">(</span><span class="coMULTI">/* 未指明 */</span>, partial_ordering v<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 合法值的定义</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> partial_ordering partial_ordering<span class="sy4">::</span><span class="me2">less</span><span class="br0">(</span>ord<span class="sy4">::</span><span class="me2">less</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> partial_ordering partial_ordering<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">(</span>eq<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> partial_ordering partial_ordering<span class="sy4">::</span><span class="me2">greater</span><span class="br0">(</span>ord<span class="sy4">::</span><span class="me2">greater</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">inline</span> <span class="kw4">constexpr</span> partial_ordering partial_ordering<span class="sy4">::</span><span class="me2">unordered</span><span class="br0">(</span>ncmp<span class="sy4">::</span><span class="me2">unordered</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::weak_ordering">类 <span class="t-lc">std::weak_ordering</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="br0">{</span>
|
|
<span class="kw1">class</span> weak_ordering <span class="br0">{</span>
|
|
<span class="kw4">int</span> value<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="co1">// 仅用于阐释的构造函数</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> weak_ordering<span class="br0">(</span>eq v<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span> value<span class="br0">(</span><span class="kw4">int</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span> <span class="co1">// 仅用于阐释</span>
|
|
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> weak_ordering<span class="br0">(</span>ord v<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span> value<span class="br0">(</span><span class="kw4">int</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span> <span class="co1">// 仅用于阐释</span>
|
|
|
|
<span class="kw1">public</span><span class="sy4">:</span>
|
|
<span class="co1">// 合法值</span>
|
|
<span class="kw4">static</span> <span class="kw4">const</span> weak_ordering less<span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">const</span> weak_ordering equivalent<span class="sy4">;</span>
|
|
<span class="kw4">static</span> <span class="kw4">const</span> weak_ordering greater<span class="sy4">;</span>
|
|
|
|
<span class="co1">// 转换</span>
|
|
<span class="kw4">constexpr</span> operator partial_ordering<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 比较</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>weak_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>weak_ordering v, weak_ordering w<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">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><</span> <span class="br0">(</span>weak_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>weak_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>weak_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>weak_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, weak_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, weak_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, weak_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, weak_ordering v<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> weak_ordering
|
|
operator<span class="sy1"><=></span><span class="br0">(</span>weak_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="kw1">friend</span> <span class="kw4">constexpr</span> weak_ordering
|
|
operator<span class="sy1"><=></span><span class="br0">(</span><span class="coMULTI">/* 未指明 */</span>, weak_ordering v<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
|
|
<span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="co1">// 合法值的定义</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> weak_ordering weak_ordering<span class="sy4">::</span><span class="me2">less</span><span class="br0">(</span>ord<span class="sy4">::</span><span class="me2">less</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> weak_ordering weak_ordering<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">(</span>eq<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> weak_ordering weak_ordering<span class="sy4">::</span><span class="me2">greater</span><span class="br0">(</span>ord<span class="sy4">::</span><span class="me2">greater</span><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::strong_ordering">类 <span class="t-lc">std::strong_ordering</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">class</span> strong_ordering <span class="br0">{</span>
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<span class="kw4">int</span> value<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="co1">// 仅用于阐释的构造函数</span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span> strong_ordering<span class="br0">(</span>eq v<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span>
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value<span class="br0">(</span><span class="kw4">int</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span> <span class="co1">// 仅用于阐释</span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span> strong_ordering<span class="br0">(</span>ord v<span class="br0">)</span> <span class="kw1">noexcept</span> <span class="sy4">:</span>
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value<span class="br0">(</span><span class="kw4">int</span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><span class="br0">}</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="co1">// 合法值</span>
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<span class="kw4">static</span> <span class="kw4">const</span> strong_ordering less<span class="sy4">;</span>
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<span class="kw4">static</span> <span class="kw4">const</span> strong_ordering equal<span class="sy4">;</span>
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<span class="kw4">static</span> <span class="kw4">const</span> strong_ordering equivalent<span class="sy4">;</span>
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<span class="kw4">static</span> <span class="kw4">const</span> strong_ordering greater<span class="sy4">;</span>
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<span class="co1">// 转换</span>
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<span class="kw4">constexpr</span> operator partial_ordering<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> operator weak_ordering<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">// 比较</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>strong_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span>
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operator<span class="sy1">==</span><span class="br0">(</span>strong_ordering v, strong_ordering w<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">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><</span> <span class="br0">(</span>strong_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>strong_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>strong_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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>strong_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, strong_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, strong_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, strong_ordering v<span class="br0">)</span> <span class="kw1">noexcept</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="coMULTI">/* 未指明 */</span>, strong_ordering v<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> strong_ordering
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operator<span class="sy1"><=></span><span class="br0">(</span>strong_ordering v, <span class="coMULTI">/* 未指明 */</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw1">friend</span> <span class="kw4">constexpr</span> strong_ordering
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operator<span class="sy1"><=></span><span class="br0">(</span><span class="coMULTI">/* 未指明 */</span>, strong_ordering v<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="co1">// 合法值的定义</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> strong_ordering strong_ordering<span class="sy4">::</span><span class="me2">less</span><span class="br0">(</span>ord<span class="sy4">::</span><span class="me2">less</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> strong_ordering strong_ordering<span class="sy4">::</span><span class="me2">equal</span><span class="br0">(</span>eq<span class="sy4">::</span><span class="me2">equal</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> strong_ordering strong_ordering<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">(</span>eq<span class="sy4">::</span><span class="me2">equivalent</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">inline</span> <span class="kw4">constexpr</span> strong_ordering strong_ordering<span class="sy4">::</span><span class="me2">greater</span><span class="br0">(</span>ord<span class="sy4">::</span><span class="me2">greater</span><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::compare_three_way">类 <span class="t-lc">std::compare_three_way</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">struct</span> compare_three_way <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="kw1">class</span> U<span class="sy1">></span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span>T<span class="sy3">&&</span> t, U<span class="sy3">&&</span> u<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw1">using</span> is_transparent <span class="sy1">=</span> <span class="coMULTI">/* 未指明 */</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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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin"></table>
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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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</div>
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</body>
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</html>
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