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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::any::</span>operator=</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-any.html">any</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">any<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> any<span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp">any<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> any<span class="sy3">&amp;&amp;</span> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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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">typename</span> ValueType<span class="sy1">&gt;</span><br />
&nbsp; &nbsp; any<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span> ValueType<span class="sy3">&amp;&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<p>&#23558;&#20869;&#23481;&#36171;&#20540;&#32473;&#25152;&#21547;&#20540;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#20197;&#22797;&#21046; <code>rhs</code> &#30340;&#29366;&#24577;&#36171;&#20540;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">any<span class="br0">(</span>rhs<span class="br0">)</span>.<span class="me1">swap</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#20197;&#31227;&#21160; <code>rhs</code> &#30340;&#29366;&#24577;&#36171;&#20540;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">any<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>rhs<span class="br0">)</span><span class="br0">)</span>.<span class="me1">swap</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span></span></span> &#12290;&#36171;&#20540;&#21518; <code>rhs</code> &#30041;&#22312;&#21512;&#27861;&#20294;&#26410;&#25351;&#23450;&#30340;&#29366;&#24577;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#20197; <code>rhs</code> &#30340;&#31867;&#22411;&#21644;&#20540;&#36171;&#20540;&#65292;&#22914;&#21516;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">any<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>ValueType<span class="sy1">&gt;</span><span class="br0">(</span>rhs<span class="br0">)</span><span class="br0">)</span>.<span class="me1">swap</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span></span></span> &#12290;&#27492;&#37325;&#36733;&#20165;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>ValueType<span class="sy1">&gt;</span></span></span> &#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp">any</span></span> &#19981;&#26159;&#21516;&#19968;&#31867;&#22411;&#19988; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_copy_constructible.html"><span class="kw533">std::<span class="me2">is_copy_constructible_v</span></span></a><span class="sy1">&lt;</span><a href="cpp-types-decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>ValueType<span class="sy1">&gt;&gt;</span></span></span> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span>&#25165;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;</div>
<h3><span class="mw-headline" id=".E6.A8.A1.E6.9D.BF.E5.8F.82.E6.95.B0">&#27169;&#26495;&#21442;&#25968;</span></h3>
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<td>ValueType</td>
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<td>&#34987;&#21547;&#26377;&#30340;&#20540;&#31867;&#22411;</td>
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<code>std::decay_t&lt;ValueType&gt;</code> &#24517;&#39035;&#28385;&#36275;<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">&#21487;&#22797;&#21046;&#26500;&#36896;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(CopyConstructible)</span></a> &#30340;&#35201;&#27714;&#12290;</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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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><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<div class="t-li1"><span class="t-li">1,3)</span> &#25243;&#20986; <span class="t-lc">bad_alloc</span> &#25110;&#20219;&#20309;&#25152;&#21547;&#31867;&#22411;&#30340;&#26500;&#36896;&#20989;&#25968;&#25152;&#25243;&#20986;&#30340;&#24322;&#24120;&#12290;&#33509;&#25243;&#20986;&#24322;&#24120;&#65292;&#21017;&#26080;&#25928;&#24212;&#65288;&#24378;&#24322;&#24120;&#20445;&#35777;&#65289;&#12290;</div>
<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-any-any.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
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<td>&#26500;&#36896; <code>any</code> &#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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