101 lines
6.4 KiB
HTML
101 lines
6.4 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_deallocate_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="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> deallocate_object<span class="br0">(</span> U<span class="sy2">*</span> p, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> n <span class="sy1">=</span> <span class="nu0">1</span> <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>解分配 <code>p</code> 所指向的存储，它必须从比较等于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>resource<span class="br0">(</span><span class="br0">)</span></span></span> 的 <span class="t-lc"><a href="cpp-memory-memory_resource.html">std::pmr::memory_resource</a></span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x</span></span> 用 <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">allocate</span><span class="br0">(</span>n<span class="sy2">*</span>sizeof<span class="br0">(</span>U<span class="br0">)</span>, alignof<span class="br0">(</span>U<span class="br0">)</span><span class="br0">)</span></span></span> 分配，通常通过调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">allocate_object<span class="sy1"><</span>U<span class="sy1">></span><span class="br0">(</span>n<span class="br0">)</span></span></span> 。</p>
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<p>等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">deallocate_bytes<span class="br0">(</span>p, n<span class="sy2">*</span>sizeof<span class="br0">(</span>U<span class="br0">)</span>, alignof<span class="br0">(</span>U<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</p>
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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>指向要解分配的内存的指针</td>
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<tr class="t-par">
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<td>n</td>
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<td>-</td>
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<td>内存所用于的 <code>U</code> 类型对象数</td>
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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.E6.84.8F">注意</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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<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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<div><a href="cpp-memory-polymorphic_allocator-delete_object.html"><span class="t-lines"><span>delete_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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<td>销毁并解分配对象<br />
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<span class="t-mark">(公开成员函数)</span></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>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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<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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<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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