116 lines
8.6 KiB
HTML
116 lines
8.6 KiB
HTML
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<title>swap(std::move_only_function)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_functional_move_only_function_swap2 skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">swap<small>(std::move_only_function)</small></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-utility.html">utility</a>‎ | <a href="cpp-utility-functional.html">functional</a>‎ | <a href="cpp-utility-functional-move_only_function.html">move only function</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">void</span> swap<span class="br0">(</span> move_only_function<span class="sy3">&</span> lhs, move_only_function<span class="sy3">&</span> rhs <span class="br0">)</span> <span class="kw1">noexcept</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-cxx23">(C++23 起)</span></td>
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<p>对 <span class="t-lc">std::move_only_function</span> 重载 <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> 算法。交换 <code>lhs</code> 与 <code>rhs</code> 的状态。等效于调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">swap</span><span class="br0">(</span>rhs<span class="br0">)</span></span></span> 。</p>
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<p>此函数对通常<a href="cpp-language-unqualified_lookup.html">无限定</a>或<a href="cpp-language-qualified_lookup.html">有限定查找</a>不可见，而只能在 <code>std::move_only_function<FunctionType></code> 为参数的关联类时由<a href="cpp-language-adl.html">实参依赖查找</a>找到。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<td>lhs, rhs</td>
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<td>-</td>
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<td>要交换状态的 <code>std::move_only_function</code> 对象</td>
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</tr>
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</table>
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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=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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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="co2">#include <concepts></span>
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<span class="co2">#include <functional></span>
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<span class="co2">#include <iostream></span>
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<span class="kw4">void</span> foo<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> str, <span class="kw4">int</span> x<span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"foo(<span class="es1">\"</span>"</span> <span class="sy1"><<</span> str <span class="sy1"><<</span> <span class="st0">"<span class="es1">\"</span>, "</span> <span class="sy1"><<</span> x <span class="sy1"><<</span> <span class="st0">")<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">void</span> bar<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> str, <span class="kw4">int</span> x<span class="br0">)</span> <span class="br0">{</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"bar(<span class="es1">\"</span>"</span> <span class="sy1"><<</span> str <span class="sy1"><<</span> <span class="st0">"<span class="es1">\"</span>, "</span> <span class="sy1"><<</span> x <span class="sy1"><<</span> <span class="st0">")<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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std<span class="sy4">::</span><span class="me2">move_only_function</span><span class="sy1"><</span><span class="kw4">void</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span>, <span class="kw4">int</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy1">></span> f1<span class="br0">{</span> foo <span class="br0">}</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">move_only_function</span><span class="sy1"><</span><span class="kw4">void</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span>, <span class="kw4">int</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy1">></span> f2<span class="br0">{</span> bar <span class="br0">}</span><span class="sy4">;</span>
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f1<span class="br0">(</span><span class="st0">"f1"</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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f2<span class="br0">(</span><span class="st0">"f2"</span>, <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"std::ranges::swap(f1, f2);<span class="es1">\n</span>"</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">swap</span><span class="br0">(</span>f1, f2<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// finds the hidden friend</span>
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f1<span class="br0">(</span><span class="st0">"f1"</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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f2<span class="br0">(</span><span class="st0">"f2"</span>, <span class="nu0">2</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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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">foo("f1", 1)
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bar("f2", 2)
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std::ranges::swap(f1, f2);
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bar("f1", 1)
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foo("f2", 2)</pre></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">
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-move_only_function-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</div>
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</td>
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<td>交换二个 <code>std::move_only_function</code> 对象的目标<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-functional-function-swap2.html"><span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::function)</span></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></div>
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</div>
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</td>
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<td>特化 <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> 算法<br />
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<span class="t-mark">(函数模板)</span></td>
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<div class="visualClear"></div>
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