95 lines
5.6 KiB
HTML
95 lines
5.6 KiB
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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<title>std::swap(std::pair)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_pair_swap2 skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>swap<small>(std::pair)</small></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-utility.html">utility</a>‎ | <a href="cpp-utility-pair.html">pair</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-utility.html"><utility></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">></span><br />
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<span class="kw4">void</span> swap<span class="br0">(</span> pair<span class="sy1"><</span>T1,T2<span class="sy1">></span><span class="sy3">&</span> x, pair<span class="sy1"><</span>T1,T2<span class="sy1">></span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="coMULTI">/* see below */</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> <span class="kw4">void</span> swap<span class="br0">(</span> pair<span class="sy1"><</span>T1,T2<span class="sy1">></span><span class="sy3">&</span> x, pair<span class="sy1"><</span>T1,T2<span class="sy1">></span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="coMULTI">/* see below */</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>交换 <code>x</code> 与 <code>y</code> 的内容。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">swap</span><span class="br0">(</span>y<span class="br0">)</span></span></span> 。</p>
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<p>此函数仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_swappable.html"><span class="kw573">std::<span class="me2">is_swappable_v</span></span></a><span class="sy1"><</span>first_type<span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-types-is_swappable.html"><span class="kw573">std::<span class="me2">is_swappable_v</span></span></a><span class="sy1"><</span>second_type<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 才参与重载决议。</p>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>x, y</td>
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<td>-</td>
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<td>要交换内容的 <code>pair</code></td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>（无）</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<div class="t-noexcept-full"><a href="cpp-language-noexcept_spec.html"><tt>noexcept</tt></a> 说明：
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<div class="t-noexcept-box"><span class="t-cc"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>x.<span class="me1">swap</span><span class="br0">(</span>y<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span></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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<div class="t-dsc-member-div">
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<div><a href="cpp-algorithm-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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<td>交换两个对象的值<br />
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<span class="t-mark">(函数模板)</span></td>
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