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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::pmr::</span>polymorphic_allocator</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-memory.html">memory</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-memory_resource.html">&lt;memory_resource&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> T <span class="sy1">&gt;</span><br />
<span class="kw1">class</span> polymorphic_allocator<span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</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">class</span> T <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">byte</span> <span class="sy1">&gt;</span><br />
<span class="kw1">class</span> polymorphic_allocator<span class="sy4">;</span></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>&#31867;&#27169;&#26495; <code>std::pmr::polymorphic_allocator</code> &#26159;&#19968;&#20010;<a href="cpp-named_req-Allocator.html"><span style="font-style:italic">&#20998;&#37197;&#22120;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(Allocator)</span></a> &#65292;&#23637;&#29616;&#20986;&#21462;&#20915;&#20110;&#20854;&#26500;&#36896;&#25152;&#29992;&#30340; <code>std::pmr::memory_resource</code> &#30340;&#19981;&#21516;&#30340;&#20998;&#37197;&#34892;&#20026;&#12290;&#22240;&#20026; <code>memory_resource</code> &#20351;&#29992;&#36816;&#34892;&#26102;&#22810;&#24577;&#31649;&#29702;&#20998;&#37197;&#22120;&#65292;&#19981;&#21516;&#30340;&#20197; <code>polymorphic_allocator</code> &#20026;&#20854;&#38745;&#24577;&#20998;&#37197;&#22120;&#31867;&#22411;&#30340;&#20998;&#37197;&#22120;&#21487;&#20114;&#25805;&#20316;&#65292;&#20294;&#33021;&#34920;&#29616;&#20026;&#22914;&#21516;&#23427;&#20204;&#25317;&#26377;&#19981;&#21516;&#30340;&#20998;&#37197;&#22120;&#31867;&#22411;&#12290;</p>
<p><code>polymorphic_allocator</code> &#30340;&#25152;&#26377;&#29305;&#21270;&#22343;&#28385;&#36275;<a href="cpp-named_req-Allocator.html#.E5.88.86.E9.85.8D.E5.99.A8.E5.AE.8C.E6.95.B4.E6.80.A7.E8.A6.81.E6.B1.82">&#20998;&#37197;&#22120;&#23436;&#25972;&#24615;&#35201;&#27714;</a>&#12290;</p>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">&#25104;&#21592;&#31867;&#22411;</span></h3>
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<td>&#25104;&#21592;&#31867;&#22411;</td>
<td>&#23450;&#20041;</td>
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<td><code>value_type</code></td>
<td><code>T</code></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-memory-polymorphic_allocator-polymorphic_allocator.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
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<td>&#26500;&#36896;&#19968;&#20010; <code>polymorphic_allocator</code><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td>
<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><span class="t-lines"><span>(&#26512;&#26500;&#20989;&#25968;)</span></span></div>
<div><span class="t-lines"><span><span class="t-mark">(&#38544;&#24335;&#22768;&#26126;)</span></span></span></div>
</div>
</td>
<td>&#38544;&#24335;&#22768;&#26126;&#30340;&#26512;&#26500;&#20989;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><span class="t-lines"><span>operator=</span></span></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34987;&#21024;&#38500;]</span></span></span></div>
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<td>&#22797;&#21046;&#36171;&#20540;&#36816;&#31639;&#31526;&#34987;&#21024;&#38500;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td colspan="2">
<h5><span class="mw-headline" id=".E5.85.AC.E5.BC.80.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;</span></h5>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-allocate.html"><span class="t-lines"><span>allocate</span></span></a></div>
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<td>&#20998;&#37197;&#20869;&#23384;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-deallocate.html"><span class="t-lines"><span>deallocate</span></span></a></div>
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<td>&#35299;&#20998;&#37197;&#20869;&#23384;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-construct.html"><span class="t-lines"><span>construct</span></span></a></div>
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<td>&#22312;&#20998;&#37197;&#30340;&#23384;&#20648;&#19978;&#26500;&#36896;&#19968;&#20010;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-destroy.html"><span class="t-lines"><span>destroy</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx20">(C++20 &#20013;&#24323;&#29992;)</span></span></span></div>
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<td>&#38144;&#27585;&#22788;&#20110;&#20998;&#37197;&#30340;&#20869;&#23384;&#30340;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-allocate_bytes.html"><span class="t-lines"><span>allocate_bytes</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>&#20174;&#24213;&#23618;&#36164;&#28304;&#20998;&#37197;&#26410;&#22788;&#29702;&#30340;&#23545;&#40784;&#20869;&#23384;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-deallocate_bytes.html"><span class="t-lines"><span>deallocate_bytes</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>&#37322;&#25918;&#20174; <code>allocate_bytes</code> &#33719;&#24471;&#30340;&#26410;&#22788;&#29702;&#20869;&#23384;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-allocate_object.html"><span class="t-lines"><span>allocate_object</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>&#20998;&#37197;&#36866;&#21512;&#21333;&#20010;&#23545;&#35937;&#25110;&#25968;&#32452;&#30340;&#26410;&#22788;&#29702;&#20869;&#23384;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-deallocate_object.html"><span class="t-lines"><span>deallocate_object</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>
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<td>&#37322;&#25918;&#30001; <code>allocate_object</code> &#33719;&#24471;&#30340;&#26410;&#22788;&#29702;&#20869;&#23384;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-new_object.html"><span class="t-lines"><span>new_object</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>&#20998;&#37197;&#24182;&#21019;&#24314;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-delete_object.html"><span class="t-lines"><span>delete_object</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>&#38144;&#27585;&#24182;&#35299;&#20998;&#37197;&#23545;&#35937;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-select_on_container_copy_construction.html"><span class="t-lines"><span>select_on_container_copy_construction</span></span></a></div>
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<td>&#20026;&#23481;&#22120;&#30340;&#22797;&#21046;&#26500;&#36896;&#20989;&#25968;&#30340;&#20351;&#29992;&#21019;&#24314;&#19968;&#20010;&#26032;&#30340; <code>polymorphic_allocator</code><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-resource.html"><span class="t-lines"><span>resource</span></span></a></div>
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<td>&#36820;&#22238;&#25351;&#21521;&#24213;&#23618; memory_resource &#30340;&#25351;&#38024;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#38750;&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-polymorphic_allocator-operator_eq.html"><span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 &#20013;&#31227;&#38500;)</span></span></span></div>
</div>
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<td>&#27604;&#36739;&#20108;&#20010; <code>polymorphic_allocator</code><br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p><code>polymorphic_allocator</code> &#22312;&#23481;&#22120;&#22797;&#21046;&#36171;&#20540;&#12289;&#31227;&#21160;&#36171;&#20540;&#25110;&#20132;&#25442;&#26102;&#19981;&#20256;&#25773;&#12290;&#32467;&#26524;&#26159;&#65292;&#20351;&#29992; <code>polymorphic_allocator</code> &#30340;&#23481;&#22120;&#30340;&#31227;&#21160;&#36171;&#20540;&#21487;&#33021;&#25243;&#20986;&#65292;&#19988;&#20132;&#25442;&#20108;&#20010;&#20351;&#29992; <code>polymorphic_allocator</code> &#65292;&#32780;&#25152;&#29992;&#20998;&#37197;&#22120;&#27604;&#36739;&#19981;&#30456;&#31561;&#30340;&#23481;&#22120;&#23548;&#33268;&#26410;&#23450;&#20041;&#34892;&#20026;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-memory_resource.html"><span class="t-lines"><span>memory_resource</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
</div>
</td>
<td>&#19968;&#20010;&#25277;&#35937;&#25509;&#21475;&#65292;&#29992;&#20110;&#21508;&#31181;&#23553;&#35013;&#20869;&#23384;&#36164;&#28304;&#30340;&#31867;<br />
<span class="t-mark">(&#31867;)</span></td>
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