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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">&#26631;&#20934;&#24211;&#22836;&#25991;&#20214;</span> &lt;new&gt;</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-header.html">header</a></span></div>
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<p>&#27492;&#22836;&#25991;&#20214;&#26159;<a href="cpp-memory.html">&#21160;&#24577;&#20869;&#23384;&#31649;&#29702;</a>&#24211;&#30340;&#19968;&#37096;&#20998;&#65292;&#29305;&#21035;&#25552;&#20379;<a href="cpp-memory-new.html">&#20302;&#23618;&#20869;&#23384;&#31649;&#29702;</a>&#29305;&#24615;&#12290;</p>
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<h3><span class="mw-headline" id=".E7.B1.BB">&#31867;</span></h3>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-bad_alloc.html"><span class="t-lines"><span>bad_alloc</span></span></a></div>
</div>
</td>
<td>&#20869;&#23384;&#20998;&#37197;&#22833;&#36133;&#26102;&#25243;&#20986;&#30340;&#24322;&#24120;<br />
<span class="t-mark">(&#31867;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-bad_array_new_length.html"><span class="t-lines"><span>bad_array_new_length</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>&#22312;&#20998;&#37197;&#26377;&#38750;&#27861;&#38271;&#24230;&#30340;&#25968;&#32452;&#26102;&#25243;&#20986;&#30340;&#24322;&#24120;<br />
<span class="t-mark">(&#31867;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-nothrow_t.html"><span class="t-lines"><span>nothrow_t</span></span></a></div>
</div>
</td>
<td>&#29992;&#20110;&#36873;&#25321;&#19981;&#25243;&#20986;<i>&#20998;&#37197;&#20989;&#25968;</i>&#30340;&#26631;&#31614;&#31867;&#22411;<br />
<span class="t-mark">(&#31867;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-align_val_t.html"><span class="t-lines"><span>align_val_t</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>&#29992;&#20110;&#21521;&#24102;&#23545;&#40784;&#20998;&#37197;&#21450;&#35299;&#20998;&#37197;&#20989;&#25968;&#20256;&#36882;&#23545;&#40784;&#20540;&#30340;&#31867;&#22411;<br />
<span class="t-mark">(&#26522;&#20030;)</span></td>
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<div><a href="cpp-memory-new-destroying_delete_t.html"><span class="t-lines"><span>destroying_delete_t</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>&#29992;&#20110;&#37492;&#21035; operator delete &#30340;&#38144;&#27585;&#21024;&#38500;&#37325;&#36733;&#30340;&#26631;&#31614;&#31867;&#22411;<br />
<span class="t-mark">(&#31867;)</span></td>
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<h3><span class="mw-headline" id=".E7.B1.BB.E5.9E.8B">&#31867;&#22411;</span></h3>
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<div><a href="cpp-memory-new-new_handler.html"><span class="t-lines"><span>new_handler</span></span></a></div>
</div>
</td>
<td>new &#22788;&#29702;&#20989;&#25968;&#30340;&#20989;&#25968;&#25351;&#38024;&#31867;&#22411;<br />
<span class="t-mark">(typedef)</span></td>
</tr>
<tr>
<td colspan="2">
<h3><span class="mw-headline" id=".E5.B8.B8.E9.87.8F">&#24120;&#37327;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-nothrow.html"><span class="t-lines"><span>nothrow</span></span></a></div>
</div>
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<td>&#29992;&#20110;&#36873;&#25321;&#19981;&#25243;&#20986;<i>&#20998;&#37197;&#20989;&#25968;</i>&#30340; <code>nothrow_t</code> &#31867;&#22411;&#23545;&#35937;<br />
<span class="t-mark">(&#24120;&#37327;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-thread-hardware_destructive_interference_size.html"><span class="t-lines"><span>hardware_destructive_interference_size</span><span>hardware_constructive_interference_size</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>&#36991;&#20813;&#20551;&#20849;&#20139;&#30340;&#26368;&#23567;&#20559;&#31227;<br />
&#20419;&#20351;&#30495;&#20849;&#20139;&#30340;&#26368;&#22823;&#20559;&#31227;<br />
<span class="t-mark">(&#24120;&#37327;)</span></td>
</tr>
<tr>
<td colspan="2">
<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">&#20989;&#25968;</span></h3>
</td>
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<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-operator_new.html"><span class="t-lines"><span>operator new</span><span>operator new[]</span></span></a></div>
</div>
</td>
<td>&#20998;&#37197;&#20989;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-operator_delete.html"><span class="t-lines"><span>operator delete</span><span>operator delete[]</span></span></a></div>
</div>
</td>
<td>&#35299;&#20998;&#37197;&#20989;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-get_new_handler.html"><span class="t-lines"><span>get_new_handler</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>&#33719;&#24471;&#24403;&#21069;&#30340; new &#22788;&#29702;&#20989;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-memory-new-set_new_handler.html"><span class="t-lines"><span>set_new_handler</span></span></a></div>
</div>
</td>
<td>&#27880;&#20876;&#19968;&#20010; new &#22788;&#29702;&#20989;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-utility-launder.html"><span class="t-lines"><span>launder</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>&#25351;&#38024;&#20248;&#21270;&#23631;&#38556;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
</table>
<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="co1">// &#23384;&#20648;&#20998;&#37197;&#38169;&#35823;</span>
<span class="kw1">class</span> bad_alloc<span class="sy4">;</span>
<span class="kw1">class</span> bad_array_new_length<span class="sy4">;</span>
<span class="kw1">struct</span> destroying_delete_t <span class="br0">{</span>
<span class="kw1">explicit</span> destroying_delete_t<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> destroying_delete_t destroying_delete<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span>
<span class="co1">// &#20840;&#23616; operator new &#25511;&#21046;</span>
<span class="kw2">enum</span> <span class="kw1">class</span> align_val_t <span class="sy4">:</span> size_t <span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">struct</span> nothrow_t <span class="br0">{</span> <span class="kw1">explicit</span> nothrow_t<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">extern</span> <span class="kw4">const</span> nothrow_t nothrow<span class="sy4">;</span>
<span class="kw1">using</span> new_handler <span class="sy1">=</span> <span class="kw4">void</span> <span class="br0">(</span><span class="sy2">*</span><span class="br0">)</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
new_handler get_new_handler<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
new_handler set_new_handler<span class="br0">(</span>new_handler new_p<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="co1">// &#25351;&#38024;&#20248;&#21270;&#23631;&#38556;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span> <span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">constexpr</span> T<span class="sy2">*</span> launder<span class="br0">(</span>T<span class="sy2">*</span> p<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="co1">// &#30828;&#20214;&#24178;&#28041;&#22823;&#23567;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> size_t hardware_destructive_interference_size <span class="sy1">=</span> <span class="coMULTI">/* &#30001;&#23454;&#29616;&#23450;&#20041; */</span><span class="sy4">;</span>
<span class="kw1">inline</span> <span class="kw4">constexpr</span> size_t hardware_constructive_interference_size <span class="sy1">=</span> <span class="coMULTI">/* &#30001;&#23454;&#29616;&#23450;&#20041; */</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="co1">// &#23384;&#20648;&#20998;&#37197;&#19982;&#35299;&#20998;&#37197;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment,
<span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment,
<span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment,
<span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <a href="cpp-memory-new-align_val_t.html"><span class="kw697">std::<span class="me2">align_val_t</span></span></a> alignment,
<span class="kw4">const</span> <a href="cpp-memory-new-nothrow_t.html"><span class="kw696">std::<span class="me2">nothrow_t</span></span></a><span class="sy3">&amp;</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a> <span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <span class="kw4">void</span><span class="sy2">*</span> ptr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">void</span><span class="sy2">*</span> <a href="cpp-memory-new-operator_new.html"><span class="kw687">operator new</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> size, <span class="kw4">void</span><span class="sy2">*</span> ptr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a> <span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <span class="kw4">void</span><span class="sy2">*</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">void</span> <a href="cpp-memory-new-operator_delete.html"><span class="kw689">operator delete</span></a><span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> ptr, <span class="kw4">void</span><span class="sy2">*</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></pre></div>
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