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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>iter_swap<small>(std::reverse_iterator)</small></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>&lrm; | <a href="cpp-iterator-reverse_iterator.html">reverse iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> std<span class="sy4">::</span><span class="me2">indirectly_swappable</span><span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span> Iter2 <span class="sy1">&gt;</span><br /></span>
<p>&nbsp; <span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">void</span><br />
&nbsp; &nbsp; iter_swap<span class="br0">(</span> <span class="kw4">const</span> reverse_iterator<span class="sy3">&amp;</span> x,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>Iter2<span class="sy1">&gt;</span><span class="sy3">&amp;</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></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#20132;&#25442;&#20108;&#20010;&#35843;&#25972;&#30340;&#36845;&#20195;&#22120;&#25152;&#25351;&#21521;&#30340;&#20803;&#32032;&#12290;&#20989;&#25968;&#20307;&#31561;&#20215;&#20110;&#65306;</p>
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<pre class="de1"><span class="kw4">auto</span> tmp_x <span class="sy1">=</span> x.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">auto</span> tmp_y <span class="sy1">=</span> y.<span class="me1">base</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span><span class="sy2">--</span>tmp_x, <span class="sy2">--</span>tmp_y<span class="br0">)</span><span class="sy4">;</span></pre></div>
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<p>&#27492;&#20989;&#25968;&#27169;&#26495;&#23545;&#36890;&#24120;<a href="cpp-language-unqualified_lookup.html">&#26080;&#38480;&#23450;</a>&#25110;<a href="cpp-language-qualified_lookup.html">&#26377;&#38480;&#23450;&#26597;&#25214;</a>&#19981;&#21487;&#35265;&#65292;&#32780;&#21482;&#33021;&#22312; <code>std::reverse_iterator&lt;Iter&gt;</code> &#20026;&#21442;&#25968;&#30340;&#20851;&#32852;&#31867;&#26102;&#30001;<a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#25214;&#21040;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>x, y</td>
<td>-</td>
<td>&#35201;&#20132;&#25442;&#20803;&#32032;&#30340;&#36870;&#21521;&#36845;&#20195;&#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=".E5.A4.8D.E6.9D.82.E5.BA.A6">&#22797;&#26434;&#24230;</span></h3>
<p>&#24120;&#25968;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<div class="t-noexcept-full"><a href="cpp-language-noexcept_spec.html"><tt>noexcept</tt></a> &#35828;&#26126;&#65306;&nbsp;&nbsp;
<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><br /></span></span>
<p>&nbsp; <a href="cpp-types-is_copy_constructible.html"><span class="kw537">std::<span class="me2">is_nothrow_copy_constructible_v</span></span></a><span class="sy1">&lt;</span>Iter<span class="sy1">&gt;</span> <span class="sy3">&amp;&amp;</span><br />
&nbsp; <a href="cpp-types-is_copy_constructible.html"><span class="kw537">std::<span class="me2">is_nothrow_copy_constructible_v</span></span></a><span class="sy1">&lt;</span>Iter2<span class="sy1">&gt;</span> <span class="sy3">&amp;&amp;</span><br />
&nbsp; <span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span><span class="sy2">--</span><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1">&lt;</span>Iter<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>, <span class="sy2">--</span><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1">&lt;</span>Iter2<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><br /></p>
<span class="br0">)</span></div>
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<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;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;list&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a> v <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-container-list.html"><span class="kw1275">std::<span class="me2">list</span></span></a> l <span class="br0">{</span><span class="nu0">4</span>, <span class="nu0">5</span>, <span class="nu0">6</span><span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span><a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">iterator</span><span class="sy1">&gt;</span> r1 <span class="br0">{</span> v.<span class="me1">rbegin</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-iterator-reverse_iterator.html"><span class="kw658">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span><a href="cpp-container-list.html"><span class="kw1275">std::<span class="me2">list</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">iterator</span><span class="sy1">&gt;</span> r2 <span class="br0">{</span> l.<span class="me1">rbegin</span><span class="br0">(</span><span class="br0">)</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="sy2">*</span>r1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>r2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
iter_swap<span class="br0">(</span>r1, r2<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="sy2">*</span>r1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>r2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</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">3 6
6 3</pre></div>
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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-algorithm-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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<td>&#20132;&#25442;&#20004;&#20010;&#23545;&#35937;&#30340;&#20540;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-algorithm-swap_ranges.html"><span class="t-lines"><span>swap_ranges</span></span></a></div>
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<td>&#20132;&#25442;&#20004;&#20010;&#33539;&#22260;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-algorithm-iter_swap.html"><span class="t-lines"><span>iter_swap</span></span></a></div>
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<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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<div><a href="cpp-iterator-ranges-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;&#20004;&#20010;&#21487;&#35299;&#24341;&#29992;&#23545;&#35937;&#25152;&#24341;&#29992;&#30340;&#20540;<br />
<span class="t-mark">(&#23450;&#21046;&#28857;&#23545;&#35937;)</span></td>
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<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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