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<title>std::swap(std::function)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>swap<small>(std::function)</small></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-utility.html">utility</a>&lrm; | <a href="cpp-utility-functional.html">functional</a>&lrm; | <a href="cpp-utility-functional-function.html">function</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-functional.html">&lt;functional&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> R, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">&gt;</span><br />
<span class="kw4">void</span> swap<span class="br0">(</span> <a href="cpp-utility-functional-function.html"><span class="kw1059">std::<span class="me2">function</span></span></a><span class="sy1">&lt;</span>R<span class="br0">(</span>Args...<span class="br0">)</span><span class="sy1">&gt;</span> <span class="sy3">&amp;</span>lhs, <a href="cpp-utility-functional-function.html"><span class="kw1059">std::<span class="me2">function</span></span></a><span class="sy1">&lt;</span>R<span class="br0">(</span>Args...<span class="br0">)</span><span class="sy1">&gt;</span> <span class="sy3">&amp;</span>rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<p>&#20026; <span class="t-lc"><a href="cpp-utility-functional-function.html">std::function</a></span> &#29305;&#21270; <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> &#31639;&#27861;&#12290;&#20132;&#25442; <code>lhs</code> &#19982; <code>rhs</code> &#30340;&#29366;&#24577;&#12290;&#31561;&#25928;&#22320;&#35843;&#29992; <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> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>lhs, rhs</td>
<td>-</td>
<td>&#35201;&#20132;&#25442;&#29366;&#24577;&#30340;&#22810;&#24577;&#20989;&#25968;&#23553;&#35013;&#22120;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;functional&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<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>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;foo(<span class="es1">\&quot;</span>&quot;</span> <span class="sy1">&lt;&lt;</span> str <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\&quot;</span>, &quot;</span> <span class="sy1">&lt;&lt;</span> x <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;)<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span>
<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>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;bar(<span class="es1">\&quot;</span>&quot;</span> <span class="sy1">&lt;&lt;</span> str <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\&quot;</span>, &quot;</span> <span class="sy1">&lt;&lt;</span> x <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;)<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-utility-functional-function.html"><span class="kw1059">std::<span class="me2">function</span></span></a><span class="sy1">&lt;</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="sy1">&gt;</span> f1<span class="br0">{</span> foo <span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-utility-functional-function.html"><span class="kw1059">std::<span class="me2">function</span></span></a><span class="sy1">&lt;</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="sy1">&gt;</span> f2<span class="br0">{</span> bar <span class="br0">}</span><span class="sy4">;</span>
f1<span class="br0">(</span><span class="st0">&quot;f1&quot;</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
f2<span class="br0">(</span><span class="st0">&quot;f2&quot;</span>, <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;std::swap(f1, f2);<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<a href="cpp-algorithm-swap.html"><span class="kw1599">std::<span class="me2">swap</span></span></a><span class="br0">(</span>f1, f2<span class="br0">)</span><span class="sy4">;</span>
f1<span class="br0">(</span><span class="st0">&quot;f1&quot;</span>, <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
f2<span class="br0">(</span><span class="st0">&quot;f2&quot;</span>, <span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">foo(&quot;f1&quot;, 1)
bar(&quot;f2&quot;, 2)
std::swap(f1, f2);
bar(&quot;f1&quot;, 1)
foo(&quot;f2&quot;, 2)</pre></div>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">&#32570;&#38519;&#25253;&#21578;</span></h3>
<p>&#19979;&#21015;&#26356;&#25913;&#34892;&#20026;&#30340;&#32570;&#38519;&#25253;&#21578;&#36861;&#28335;&#22320;&#24212;&#29992;&#20110;&#20197;&#21069;&#20986;&#29256;&#30340; C++ &#26631;&#20934;&#12290;</p>
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<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2062">LWG 2062</a></td>
<td>C++11</td>
<td>&#26410;&#35201;&#27714; <code>swap</code> &#23545; <code>function</code> &#30340;&#37325;&#36733;&#20026; noexcept</td>
<td>&#24050;&#35201;&#27714;</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-utility-functional-function-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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<td>&#20132;&#25442;&#20869;&#23481;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-utility-functional-move_only_function-swap2.html"><span class="t-lines"><span>swap<span class="t-dsc-small">(std::move_only_function)</span></span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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<td>&#37325;&#36733; <span class="t-lc"><a href="cpp-algorithm-swap.html">std::swap</a></span> &#31639;&#27861;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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