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<title>std::hash &lt;std::variant&gt;</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>hash <small>&lt;std::variant&gt;</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-variant.html">variant</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-variant.html">&lt;variant&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>... <span class="me1">Types</span><span class="sy1">&gt;</span><br />
<span class="kw1">struct</span> hash<span class="sy1">&lt;</span><a href="cpp-utility-variant.html"><span class="kw1085">std::<span class="me2">variant</span></span></a><span class="sy1">&lt;</span>Types...<span class="sy1">&gt;&gt;</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<p><span class="t-lc"><a href="cpp-utility-hash.html">std::hash</a></span> &#23545; <span class="t-lc"><a href="cpp-utility-variant.html">std::variant</a></span> &#27169;&#26495;&#30340;&#27169;&#26495;&#29305;&#21270;&#20801;&#35768;&#29992;&#25143;&#33719;&#24471; <code>variant</code> &#23545;&#35937;&#30340;&#21704;&#24076;&#12290;</p>
<p>&#33509;&#21551;&#29992; <span class="t-lc">std::hash&lt;std::remove_const_t&lt;Types&gt;&gt;...</span> &#20013;&#30340;&#27599;&#20010;&#29305;&#21270;&#65292;&#21017;&#21551;&#29992;&#29305;&#21270; <span class="t-lc">std::hash&lt;std::variant&lt;Types...&gt;&gt;</span> &#65288;&#35265; <span class="t-lc"><a href="cpp-utility-hash.html">std::hash</a></span> &#65289;&#65292;&#21542;&#21017;&#31105;&#29992;&#23427;&#12290;</p>
<p>&#19981;&#20445;&#35777;&#27492;&#29305;&#21270;&#30340;&#25104;&#21592;&#20989;&#25968;&#20026; noexcept &#12290;</p>
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<td>Types</td>
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<td><code>variant</code> &#23545;&#35937;&#25152;&#25903;&#25345;&#30340;&#21487;&#36873;&#39033;&#31867;&#22411;</td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#19981;&#21516;&#20110; <a href="cpp-utility-optional-hash.html"><tt>std::hash&lt;std::optional&gt;</tt></a> &#65292; <code>variant</code> &#30340;&#21704;&#24076;&#36890;&#24120;&#19981;&#20250;&#21704;&#24076;&#25152;&#21547;&#30340;&#20540;&#65307;&#36825;&#20351;&#24471;&#21487;&#33021;&#36776;&#21035;&#20445;&#26377;&#21516;&#19968;&#20540;&#20026;&#19981;&#21516;&#21487;&#36873;&#39033;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-variant.html"><span class="kw1085">std::<span class="me2">variant</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <span class="kw4">int</span><span class="sy1">&gt;</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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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-hash.html"><span class="t-lines"><span>hash</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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