101 lines
5.5 KiB
HTML
101 lines
5.5 KiB
HTML
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<title>std::pmr::polymorphic_allocator<T>::deallocate_object</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_polymorphic_allocator_delete_object skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::pmr::polymorphic_allocator<T>::</span>deallocate_object</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-memory.html">memory</a>‎ | <a href="cpp-memory-polymorphic_allocator.html">polymorphic allocator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> U<span class="sy1">></span><br />
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<span class="kw4">void</span> delete_object<span class="br0">(</span> U<span class="sy2">*</span> p <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>销毁 <code>U</code> 类型对象并解分配为它分配的存储。</p>
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<p>等价于</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>polymorphic_allocator<span class="sy1">></span><span class="sy4">::</span><span class="me2">destroy</span><span class="br0">(</span><span class="sy2">*</span>this, p<span class="br0">)</span><span class="sy4">;</span>
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deallocate_object<span class="br0">(</span>p<span class="br0">)</span><span class="sy4">;</span></pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>p</td>
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<td>-</td>
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<td>指向要销毁并解分配的对象的指针</td>
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</table>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不抛出。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>引入此函数是为了用于全特化分配器 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">polymorphic_allocator</span><span class="sy1"><></span></span></span> ，但它可能在任何特化中都有用。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-polymorphic_allocator-deallocate_bytes.html"><span class="t-lines"><span>deallocate_bytes</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>释放从 <code>allocate_bytes</code> 获得的未处理内存<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-polymorphic_allocator-deallocate_object.html"><span class="t-lines"><span>deallocate_object</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>释放由 <code>allocate_object</code> 获得的未处理内存<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-allocator_traits-deallocate.html"><span class="t-lines"><span>deallocate</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div>
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</div>
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</td>
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<td>用分配器解分配存储<br />
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<span class="t-mark">(<code>std::allocator_traits<Alloc></code> 的公开静态成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-memory_resource-deallocate.html"><span class="t-lines"><span>deallocate</span></span></a></div>
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</div>
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</td>
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<td>解分配内存<br />
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<span class="t-mark">(<code>std::pmr::memory_resource</code> 的公开成员函数)</span></td>
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