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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ranges::</span>iter_swap</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-iterator.html">iterator</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-iterator.html">&lt;iterator&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw1">namespace</span> <span class="coMULTI">/*unspecified*/</span> <span class="br0">{</span><br /></span>
<p>&nbsp; &nbsp; <span class="kw1">inline</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*unspecified*/</span> iter_swap <span class="sy1">=</span> <span class="coMULTI">/*unspecified*/</span><span class="sy4">;</span><br /></p>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span><br />
<span class="t-mark">(&#23450;&#21046;&#28857;&#23545;&#35937;)</span></td>
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<div>&#35843;&#29992;&#31614;&#21517;</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> I1, <span class="kw1">class</span> I2 <span class="sy1">&gt;</span><br /></span>
<p>&nbsp; &nbsp; requires <span class="coMULTI">/* see below */</span><br /></p>
<span class="kw4">constexpr</span> <span class="kw4">void</span> iter_swap<span class="br0">(</span>I1<span class="sy3">&amp;&amp;</span> i1, I2<span class="sy3">&amp;&amp;</span> i2<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></div>
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<p>&#20132;&#25442;&#20108;&#20010;&#36845;&#20195;&#22120;&#25152;&#20195;&#34920;&#30340;&#20540;&#12290;</p>
<p>&#20196; <code>i1</code> &#19982; <code>i2</code> &#20998;&#21035;&#20026; <code>I1</code> &#19982; <code>I2</code> &#31867;&#22411;&#23545;&#35937;&#65292;&#35843;&#29992; <code>ranges::iter_swap</code> &#34920;&#36798;&#24335;&#31561;&#20215;&#20110;&#65306;</p>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>iter_swap<span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span><span class="br0">(</span>i1<span class="br0">)</span>, <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span><span class="br0">(</span>i2<span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">remove_cvref_t</span><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">remove_cvref_t</span><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span></span></span> &#20026;&#31867;&#25110;&#26522;&#20030;&#31867;&#22411;&#65292;&#19988;&#35813;&#34920;&#36798;&#24335;&#22312;&#19981;&#27714;&#35821;&#22659;&#20013;&#20026;&#33391;&#26500;&#65292;&#20854;&#20013;&#20197;&#19979;&#21015;&#20505;&#36873;&#36827;&#34892;<a href="cpp-language-overload_resolution.html">&#37325;&#36733;&#20915;&#35758;</a>&#65306;
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> iter_swap<span class="br0">(</span><span class="kw4">auto</span>, <span class="kw4">auto</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></span></li>
<li><a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#25152;&#25214;&#21040;&#30340;&#20219;&#20309; <code>iter_swap</code> &#22768;&#26126;&#12290;</li>
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<dd>&#33509;&#36873;&#25321;&#30340;&#37325;&#36733;&#19981;&#20132;&#25442; <code>i1</code> &#19982; <code>i2</code>, &#30340;&#20540;&#65292;&#21017;&#31243;&#24207;&#20026;&#35884;&#26500;&#65292;&#19981;&#35201;&#27714;&#35786;&#26029;&#12290;</dd>
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<li>&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">swap</span><span class="br0">(</span><span class="sy2">*</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span><span class="br0">(</span>i1<span class="br0">)</span>, <span class="sy2">*</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span><span class="br0">(</span>i2<span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#33509; <code>I1</code> &#19982; <code>I2</code> &#22343;&#23454;&#29616; <a href="cpp-iterator-indirectly_readable.html"><code>indirectly_readable</code></a> &#19988;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span></span></span> &#23454;&#29616; <a href="cpp-concepts-swappable.html"><code>swappable_with</code></a> &#12290;</li>
<li>&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span><span class="br0">(</span><span class="sy2">*</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span><span class="br0">(</span>i1<span class="br0">)</span> <span class="sy1">=</span> <span class="coMULTI">/*iter_exchange_move*/</span><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span><span class="br0">(</span>i2<span class="br0">)</span>, <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>I1<span class="sy1">&gt;</span><span class="br0">(</span>i1<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span> &#65292;&#33509; <code>I1</code> &#19982; <code>I2</code> &#23454;&#29616; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">indirectly_move_storable</span><span class="sy1">&lt;</span>I1, I2<span class="sy1">&gt;</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">indirectly_move_storable</span><span class="sy1">&lt;</span>I2, I1<span class="sy1">&gt;</span></span></span> &#65292;&#20854;&#20013; <code><i>iter_exchange_move</i></code> &#26159;&#25551;&#36848;&#20110;&#19979;&#30340;&#30340;&#20165;&#29992;&#20110;&#38416;&#37322;&#30340;&#20989;&#25968;&#27169;&#26495;&#12290;</li>
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<p>&#25152;&#26377;&#20854;&#20182;&#24773;&#20917;&#19979;&#65292;&#35843;&#29992; <code>ranges::iter_swap</code> &#20026;&#35884;&#26500;&#65292;&#36825;&#33021; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span>e1, e2<span class="br0">)</span></span></span> &#22312;&#20986;&#29616;&#20110;&#27169;&#26495;&#23454;&#20363;&#21270;&#30340;&#31435;&#21363;&#35821;&#22659;&#26102;&#23548;&#33268;<a href="cpp-language-sfinae.html">&#26367;&#25442;&#22833;&#36133;</a>&#12290;</p>
<p>&#20165;&#29992;&#20110;&#38416;&#37322;&#30340;&#20989;&#25968;&#27169;&#26495; <code><i>iter_exchange_move</i></code> &#31561;&#20215;&#22320;&#23450;&#20041;&#20026;&#65306;</p>
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<pre class="de1"><span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> X, <span class="kw1">class</span> Y<span class="sy1">&gt;</span>
<span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">iter_value_t</span><span class="sy1">&lt;</span>X<span class="sy1">&gt;</span> <span class="coMULTI">/*iter_exchange_move*/</span><span class="br0">(</span>X<span class="sy3">&amp;&amp;</span> x, Y<span class="sy3">&amp;&amp;</span> y<span class="br0">)</span>
<span class="kw1">noexcept</span><span class="br0">(</span><span class="kw1">noexcept</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">iter_value_t</span><span class="sy1">&lt;</span>X<span class="sy1">&gt;</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span> <span class="sy3">&amp;&amp;</span>
<span class="kw1">noexcept</span><span class="br0">(</span><span class="sy2">*</span>x <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>y<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy4">::</span><span class="me2">iter_value_t</span><span class="sy1">&lt;</span>X<span class="sy1">&gt;</span> old<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="sy2">*</span>x <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>y<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> old<span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<h3><span class="mw-headline" id=".E8.A1.A8.E8.BE.BE.E5.BC.8F.E7.AD.89.E4.BB.B7">&#34920;&#36798;&#24335;&#31561;&#20215;</span></h3>
<p>&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">e</span></span> <i>&#34920;&#36798;&#24335;&#31561;&#20215;</i>&#20110;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">f</span></span> &#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">e</span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">f</span></span> &#25317;&#26377;&#30456;&#21516;&#25928;&#26524;&#65292;&#22343;&#20026;<a href="cpp-language-noexcept_spec.html">&#28508;&#22312;&#25243;&#20986;</a>&#25110;&#22343;&#38750;&#28508;&#22312;&#25243;&#20986;&#65288;&#21363; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span>e<span class="br0">)</span> <span class="sy1">==</span> <span class="kw1">noexcept</span><span class="br0">(</span>f<span class="br0">)</span></span></span> &#65289;&#65292;&#19988;&#22343;&#20026;<a href="cpp-language-constant_expression.html">&#24120;&#37327;&#23376;&#34920;&#36798;&#24335;</a>&#25110;&#22343;&#38750;&#24120;&#37327;&#23376;&#34920;&#36798;&#24335;&#12290;</p>
<h3><span class="mw-headline" id=".E5.AE.9A.E5.88.B6.E7.82.B9.E5.AF.B9.E8.B1.A1">&#23450;&#21046;&#28857;&#23545;&#35937;</span></h3>
<p>&#21517;&#23383; <code>ranges::iter_swap</code> &#20195;&#34920;&#19968;&#20010;<i>&#23450;&#21046;&#28857;&#23545;&#35937;</i>&#65292;&#23427;&#26159;<a href="cpp-named_req-LiteralType.html">&#23383;&#38754;</a> <a href="cpp-concepts-semiregular.html"><code>semiregular</code></a> &#31867;&#31867;&#22411;&#30340; const <a href="cpp-named_req-FunctionObject.html">&#20989;&#25968;&#23545;&#35937;</a>&#12290;&#20026;&#35828;&#26126;&#30446;&#30340;&#65292;&#20197; <code><i>__iter_swap_fn</i></code> &#34920;&#31034;&#20854;&#31867;&#22411;&#30340; cv &#26080;&#38480;&#23450;&#29256;&#26412;&#12290;</p>
<p><code><i>__iter_swap_fn</i></code> &#30340;&#25152;&#26377;&#23454;&#20363;&#22343;&#30456;&#31561;&#12290;&#22312;&#30456;&#21516;&#21442;&#25968;&#19978;&#35843;&#29992;&#31867;&#22411; <code><i>__iter_swap_fn</i></code> &#30340;&#19981;&#21516;&#23454;&#20363;&#30340;&#25928;&#26524;&#26159;&#31561;&#20215;&#30340;&#65292;&#26080;&#20851;&#20046;&#25351;&#20195;&#35813;&#23454;&#20363;&#30340;&#34920;&#36798;&#24335;&#26159;&#24038;&#20540;&#36824;&#26159;&#21491;&#20540;&#65292;&#20197;&#21450;&#26159;&#21542;&#20026; const &#38480;&#23450;&#65288;&#28982;&#32780;&#19981;&#35201;&#27714; volatile &#38480;&#23450;&#30340;&#23454;&#20363;&#21487;&#35843;&#29992;&#65289;&#12290;&#20174;&#32780;&#33021;&#33258;&#30001;&#22320;&#22797;&#21046; <code>ranges::iter_swap</code> &#24182;&#19988;&#33021;&#24444;&#27492;&#26367;&#20195;&#22320;&#20351;&#29992;&#20854;&#21103;&#26412;&#12290;</p>
<p>&#32473;&#23450;&#31867;&#22411;&#38598;&#21512; <code>Args...</code> &#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1">&lt;</span>Args<span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>...</span></span> &#28385;&#36275;&#19978;&#38754;&#23545;&#20110; <code>ranges::iter_swap</code> &#30340;&#21442;&#25968;&#35201;&#27714;&#65292;&#21017; <code><i>__iter_swap_fn</i></code> &#23454;&#29616; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span>__iter_swap_fn, Args...<span class="sy1">&gt;</span></span></span>&#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span><span class="kw4">const</span> __iter_swap_fn, Args...<span class="sy1">&gt;</span></span></span>&#12289; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span>__iter_swap_fn<span class="sy3">&amp;</span>, Args...<span class="sy1">&gt;</span></span></span> &#21450; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1">&lt;</span><span class="kw4">const</span> __iter_swap_fn<span class="sy3">&amp;</span>, Args...<span class="sy1">&gt;</span></span></span> &#12290;&#21542;&#21017;&#65292; <code><i>__iter_swap_fn</i></code> &#30340;&#20989;&#25968;&#35843;&#29992;&#36816;&#31639;&#31526;&#19981;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-iterator-reverse_iterator-iter_swap.html"><span class="t-lines"><span>iter_swap</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#20132;&#25442;&#20108;&#20010;&#35843;&#25972;&#21518;&#30340;&#24213;&#23618;&#36845;&#20195;&#22120;&#25152;&#25351;&#21521;&#30340;&#23545;&#35937;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-iterator-move_iterator-iter_swap.html"><span class="t-lines"><span>iter_swap</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#20132;&#25442;&#20108;&#20010;&#24213;&#23618;&#36845;&#20195;&#22120;&#25152;&#25351;&#21521;&#30340;&#23545;&#35937;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-iter_swap.html"><span class="t-lines"><span>iter_swap</span></span></a></div>
</div>
</td>
<td>&#20132;&#25442;&#20004;&#20010;&#36845;&#20195;&#22120;&#25152;&#25351;&#21521;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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