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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>iter_swap<small>(std::common_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-common_iterator.html">common 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>I<span class="sy1">&gt;</span> I2, <span class="kw1">class</span> S2 <span class="sy1">&gt;</span><br /></span>
<p><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> common_iterator<span class="sy3">&amp;</span> x,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1">&lt;</span>I2, S2<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;&#24213;&#23618;&#36845;&#20195;&#22120;&#25152;&#25351;&#21521;&#30340;&#23545;&#35937;&#12290;&#33509; <code>x</code> &#19981;&#20445;&#26377; <code>I</code> &#23545;&#35937;&#25110; <code>y</code> &#19981;&#20445;&#26377; <code>I2</code> &#23545;&#35937;&#65288;&#21363; <code>x</code> &#19982; <code>y</code> &#20013;&#33267;&#23569;&#19968;&#20010;&#19981;&#20445;&#26377;&#36845;&#20195;&#22120;&#65289;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<p>&#20989;&#25968;&#20307;&#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges&#8203;<span class="sy4">::</span>&#8203;iter_swap<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span>I<span class="sy1">&gt;</span><span class="br0">(</span>x.<span class="me1">var</span><span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">get</span><span class="sy1">&lt;</span>I2<span class="sy1">&gt;</span><span class="br0">(</span>y.<span class="me1">var</span><span class="br0">)</span><span class="br0">)</span></span></span> &#12290;</p>
<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::common_iterator&amp;ltI,S&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>&#25351;&#21521;&#35201;&#20132;&#25442;&#30340;&#20803;&#32032;&#30340;&#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;&#12290;</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><span class="kw1">noexcept</span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_swap</span><span class="br0">(</span><a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1">&lt;</span><span class="kw4">const</span> I<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="br0">(</span><span class="br0">)</span>, <a href="cpp-utility-declval.html"><span class="kw1120">std::<span class="me2">declval</span></span></a><span class="sy1">&lt;</span><span class="kw4">const</span> I2<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><span class="br0">)</span></span></span></div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;string&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><span class="sy1">&lt;</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">&gt;</span> v1 <span class="br0">{</span> <span class="st0">&quot;1&quot;</span>, <span class="st0">&quot;2&quot;</span>, <span class="st0">&quot;3&quot;</span>, <span class="st0">&quot;4&quot;</span>, <span class="st0">&quot;5&quot;</span> <span class="br0">}</span>,
v2 <span class="br0">{</span> <span class="st0">&quot;&alpha;&quot;</span>, <span class="st0">&quot;&beta;&quot;</span>, <span class="st0">&quot;&gamma;&quot;</span>, <span class="st0">&quot;&delta;&quot;</span>, <span class="st0">&quot;&epsilon;&quot;</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">using</span> CI <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">common_iterator</span><span class="sy1">&lt;</span>
std<span class="sy4">::</span><span class="me2">counted_iterator</span><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><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">iterator</span><span class="sy1">&gt;</span>,
std<span class="sy4">::</span><span class="me2">default_sentinel_t</span>
<span class="sy1">&gt;</span><span class="sy4">;</span>
CI first1 <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span> <span class="br0">{</span> v1.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">3</span> <span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
CI first2 <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span> <span class="br0">{</span> v2.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">4</span> <span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
CI last <span class="br0">{</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">auto</span> print <span class="sy1">=</span> <span class="br0">[</span><span class="sy3">&amp;</span><span class="br0">]</span> <span class="br0">(</span><span class="kw4">auto</span> rem<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> rem <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;v1 = &quot;</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>v1, <a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">&gt;</span><span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">&quot; &quot;</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="st0">&quot;<span class="es1">\n</span>v2 = &quot;</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>v2, <a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1">&lt;</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">&gt;</span><span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">&quot; &quot;</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="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
print<span class="br0">(</span><span class="st0">&quot;Before iter_swap:<span class="es1">\n</span>&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="sy4">;</span> first1 <span class="sy3">!</span><span class="sy1">=</span> last <span class="sy3">&amp;&amp;</span> first2 <span class="sy3">!</span><span class="sy1">=</span> last<span class="sy4">;</span> <span class="sy2">++</span>first1, <span class="sy2">++</span>first2<span class="br0">)</span> <span class="br0">{</span>
iter_swap<span class="br0">(</span> first1, first2 <span class="br0">)</span><span class="sy4">;</span> <span class="co1">// ADL</span>
<span class="br0">}</span>
print<span class="br0">(</span><span class="st0">&quot;After iter_swap:<span class="es1">\n</span>&quot;</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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<div class="text source-text">
<pre class="de1">Before iter_swap:
v1 = 1 2 3 4 5
v2 = &alpha; &beta; &gamma; &delta; &epsilon;
After iter_swap:
v1 = &alpha; &beta; &gamma; 4 5
v2 = 1 2 3 &delta; &epsilon;</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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<tr>
<th>DR</th>
<th>&#24212;&#29992;&#20110;</th>
<th>&#20986;&#29256;&#26102;&#30340;&#34892;&#20026;</th>
<th>&#27491;&#30830;&#34892;&#20026;</th>
</tr>
<tr>
<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3574">LWG 3574</a></td>
<td>C++20</td>
<td><code>variant</code> &#20026;&#23436;&#20840; constexpr (P2231R1) &#20294; <code>common_iterator</code> &#19981;&#26159;</td>
<td>&#20134;&#20351;&#20043;&#20026; constexpr</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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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
</div>
</td>
<td>&#20132;&#25442;&#20004;&#20010;&#23545;&#35937;&#30340;&#20540;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-algorithm-swap_ranges.html"><span class="t-lines"><span>swap_ranges</span></span></a></div>
</div>
</td>
<td>&#20132;&#25442;&#20004;&#20010;&#33539;&#22260;&#30340;&#20803;&#32032;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<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>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<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>
</div>
</td>
<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>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-counted_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>
</div>
</td>
<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>
</tr>
</table>
</div>
<div class="visualClear"></div>
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