334 lines
25 KiB
HTML
334 lines
25 KiB
HTML
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<title>std::scoped_allocator_adaptor</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_scoped_allocator_adaptor 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::</span>scoped_allocator_adaptor</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-memory.html">memory</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-scoped_allocator.html"><scoped_allocator></a></code></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> OuterAlloc, <span class="kw1">class</span>... <span class="me1">InnerAlloc</span> <span class="sy1">></span><br />
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<span class="kw1">class</span> scoped_allocator_adaptor <span class="sy4">:</span> <span class="kw1">public</span> OuterAlloc<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-cxx11">(C++11 起)</span></td>
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<p><code>std::scoped_allocator_adaptor</code> 类模板是可用于多层容器（ map 的 list 的 set 的 vector 等等）的分配器。它以外层分配器类型 <code>OuterAlloc</code> 与零或更多个内层分配器类型 <code>InnerAlloc...</code> 实例化。直接以 <code>scoped_allocator_adaptor</code> 构造的容器用 <code>OuterAlloc</code> 分配其元素，但若元素自身是容器，则它使用首个内存分配器。该容器的元素，若其自身是容器，则使用第二个内存分配器，以此类推。若容器的层级多于内层分配器的数量，则最内层分配器为所有进一步内嵌的容器再度使用。</p>
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<p>此适配器的目的是在内嵌容器中正确初始化有状态分配器，例如在所有层次的嵌套容器都必须置于同一共享内存段时。适配器的构造函数接收列表中所有分配器的参数，而每个内嵌容器从适配器按需获得其分配器的状态。</p>
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<p>为了 <code>scoped_allocator_adaptor</code> 的目的，若下个内层分配器是 <code>A</code> ，则任何满足 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-uses_allocator.html"><span class="kw704">std::<span class="me2">uses_allocator</span></span></a><span class="sy1"><</span>T,A<span class="sy1">></span><span class="sy4">::</span><span class="me2">value</span> <span class="sy1">==</span> <span class="kw2">true</span></span></span> 的类 <code>T</code> 参与递归，如同它是容器，另外， <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 被当做这种容器，通过 <a href="cpp-memory-scoped_allocator_adaptor-construct.html"><tt>scoped_allocator_adaptor::construct</tt></a> 的指定重载。</p>
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<p>典型实现保有一个 <code>std::scoped_allocator_adaptor<InnerAllocs...></code> 作为成员对象。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>类型</td>
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<td>定义</td>
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<td><code>outer_allocator_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">OuterAlloc</span></span></td>
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<tr class="t-dsc">
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<td><code>inner_allocator_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">scoped_allocator_adaptor<span class="sy1"><</span>InnerAllocs...<span class="sy1">></span></span></span> ，或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>InnerAllocs<span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> 则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">scoped_allocator_adaptor<span class="sy1"><</span>OuterAlloc<span class="sy1">></span></span></span></td>
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<td><code>value_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">value_type</span></span></span></td>
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<td><code>size_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">size_type</span></span></span></td>
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<tr class="t-dsc">
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<td><code>difference_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">difference_type</span></span></span></td>
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<td><code>pointer</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">pointer</span></span></span></td>
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<td><code>const_pointer</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">const_pointer</span></span></span></td>
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<tr class="t-dsc">
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<td><code>void_pointer</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">void_pointer</span></span></span></td>
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<tr class="t-dsc">
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<td><code>const_void_pointer</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="me2">const_void_pointer</span></span></span></td>
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<td colspan="2"><code>propagate_on_container_copy_assignment</code>
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<dd>
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<dd>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>A<span class="sy1">></span><span class="sy4">::</span><span class="me2">propagate_on_container_copy_assignment</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对于 <code>OuterAlloc</code> 与 <code>InnerAlloc...</code> 之中至少一个分配器为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则为 <span class="t-lc"><a href="cpp-types-integral_constant.html">std::true_type</a></span></dd>
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</dl>
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</dd>
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</dl>
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<tr class="t-dsc">
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<td colspan="2"><code>propagate_on_container_move_assignment</code>
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<dd>
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<dd>若 {<span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>A<span class="sy1">></span><span class="sy4">::</span><span class="me2">propagate_on_container_move_assignment</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对于 <code>OuterAlloc</code> 与 <code>InnerAlloc...</code> 之中至少一个分配器为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则为 <span class="t-lc"><a href="cpp-types-integral_constant.html">std::true_type</a></span></dd>
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</dl>
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</dd>
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</dl>
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<tr class="t-dsc">
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<td colspan="2"><code>propagate_on_container_swap</code>
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<dl>
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<dd>
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<dd>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>A<span class="sy1">></span><span class="sy4">::</span><span class="me2">propagate_on_container_swap</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对于 <code>OuterAlloc</code> 与 <code>InnerAlloc...</code> 之中至少一个分配器为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则为 <span class="t-lc"><a href="cpp-types-integral_constant.html">std::true_type</a></span></dd>
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</dl>
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</dd>
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</dl>
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</td>
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<tr class="t-dsc">
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<td colspan="2"><code>is_always_equal</code><span class="t-mark-rev t-since-cxx17">(C++17)</span>
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<dl>
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<dd>
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<dl>
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<dd>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>A<span class="sy1">></span><span class="sy4">::</span><span class="me2">is_always_equal</span><span class="sy4">::</span><span class="me2">value</span></span></span> 对于 <code>OuterAlloc</code> 与 <code>InnerAlloc...</code> 中每个分配器为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 则为 <span class="t-lc"><a href="cpp-types-integral_constant.html">std::true_type</a></span></dd>
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</dl>
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</dd>
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</dl>
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</td>
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<tr class="t-dsc">
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<td colspan="2"><code>rebind</code>
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<div style="padding-left:3em; max-width: 50em; overflow: hidden;">
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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"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span>
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<span class="kw1">struct</span> rebind <span class="br0">{</span>
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<span class="kw1">typedef</span> scoped_allocator_adaptor<span class="sy1"><</span>
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<a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>OuterAlloc<span class="sy1">></span><span class="sy4">::</span><span class="kw1">template</span> rebind_alloc<span class="sy1"><</span>T<span class="sy1">></span>,
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InnerAllocs...
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<span class="sy1">></span> other<span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span></pre></div>
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</div>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-memory-scoped_allocator_adaptor-scoped_allocator_adaptor.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>创建新的 scoped_allocator_adaptor 实例<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 t-dsc-member-nobold-div">
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<div><a href="cpp-memory-scoped_allocator_adaptor-~scoped_allocator_adaptor.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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</div>
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</td>
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<td>析构 scoped_allocator_adaptor 实例<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-scoped_allocator_adaptor-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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</div>
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</td>
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<td>赋值一个 <code>scoped_allocator_adaptor</code><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-scoped_allocator_adaptor-inner_allocator.html"><span class="t-lines"><span>inner_allocator</span></span></a></div>
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</div>
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</td>
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<td>获得一个 <code>inner_allocator</code> 引用<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-scoped_allocator_adaptor-outer_allocator.html"><span class="t-lines"><span>outer_allocator</span></span></a></div>
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</div>
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</td>
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<td>获得一个 <code>outer_allocator</code> 引用<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-scoped_allocator_adaptor-allocate.html"><span class="t-lines"><span>allocate</span></span></a></div>
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</div>
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</td>
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<td>用外层分配器分配未初始化存储<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-scoped_allocator_adaptor-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>用外层分配器解分配存储<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-scoped_allocator_adaptor-max_size.html"><span class="t-lines"><span>max_size</span></span></a></div>
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</div>
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</td>
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<td>返回外层分配器所支持的最大分配大小<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-scoped_allocator_adaptor-construct.html"><span class="t-lines"><span>construct</span></span></a></div>
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</div>
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</td>
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<td>在分配的存储上构造一个对象，若适合则传递内存分配器至其构造函数<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-scoped_allocator_adaptor-destroy.html"><span class="t-lines"><span>destroy</span></span></a></div>
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</div>
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</td>
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<td>析构处于分配的存储的对象<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-scoped_allocator_adaptor-select_on_container_copy_construction.html"><span class="t-lines"><span>select_on_container_copy_construction</span></span></a></div>
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</div>
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</td>
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<td>复制 scoped_allocator_adaptor 与其所有分配器的状态<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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</table>
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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">非成员函数</span></h3>
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<table class="t-dsc-begin">
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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-scoped_allocator_adaptor-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div>
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<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span></span></div>
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</div>
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</td>
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<td>比较两个 scoped_allocator_adaptor 实例<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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</table>
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<h3><span class="mw-headline" id=".E6.8E.A8.E5.AF.BC.E6.8C.87.E5.BC.95.28C.2B.2B17_.E8.B5.B7.29"><a href="cpp-memory-scoped_allocator_adaptor-deduction_guides.html">推导指引</a><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></span></h3>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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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"><span class="co2">#include <vector></span>
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<span class="co2">#include <scoped_allocator></span>
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<span class="co2">#include <boost/interprocess/managed_shared_memory.hpp></span>
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<span class="co2">#include <boost/interprocess/allocators/adaptive_pool.hpp></span>
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<span class="kw1">namespace</span> bi <span class="sy1">=</span> boost<span class="sy4">::</span><span class="me2">interprocess</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="kw1">using</span> alloc <span class="sy1">=</span> bi<span class="sy4">::</span><span class="me2">adaptive_pool</span><span class="sy1"><</span>T,
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bi<span class="sy4">::</span><span class="me2">managed_shared_memory</span><span class="sy4">::</span><span class="me2">segment_manager</span><span class="sy1">></span><span class="sy4">;</span>
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<span class="kw1">using</span> ipc_row <span class="sy1">=</span> <a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">int</span>, alloc<span class="sy1"><</span><span class="kw4">int</span><span class="sy1">>></span><span class="sy4">;</span>
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<span class="kw1">using</span> ipc_matrix <span class="sy1">=</span> <a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span>ipc_row, std<span class="sy4">::</span><span class="me2">scoped_allocator_adaptor</span><span class="sy1"><</span>alloc<span class="sy1"><</span>ipc_row<span class="sy1">>>></span><span class="sy4">;</span>
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<span class="kw4">int</span> main <span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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bi<span class="sy4">::</span><span class="me2">managed_shared_memory</span> s<span class="br0">(</span>bi<span class="sy4">::</span><span class="me2">create_only</span>, <span class="st0">"Demo"</span>, <span class="nu0">65536</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 在共享内存中创建 vector 的 vector</span>
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ipc_matrix v<span class="br0">(</span>s.<span class="me1">get_segment_manager</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 对于所有这些附加项，内层 vector 从外层 vector 的 scoped_allocator_adaptor</span>
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<span class="co1">// 获得其分配器参数</span>
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v.<span class="me1">resize</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span> v<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>.<span class="me1">push_back</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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v.<span class="me1">emplace_back</span><span class="br0">(</span><span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-container-vector.html"><span class="kw1268">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> local_row <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>,<span class="nu0">2</span>,<span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span>
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v.<span class="me1">emplace_back</span><span class="br0">(</span>local_row.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, local_row.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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bi<span class="sy4">::</span><span class="me2">shared_memory_object</span><span class="sy4">::</span><span class="me2">remove</span><span class="br0">(</span><span class="st0">"Demo"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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</div>
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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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<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.html"><span class="t-lines"><span>allocator_traits</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>提供关于分配器类型的信息<br />
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<span class="t-mark">(类模板)</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-uses_allocator.html"><span class="t-lines"><span>uses_allocator</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>检查指定的类型是否支持使用分配器的构造<br />
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<span class="t-mark">(类模板)</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-allocator.html"><span class="t-lines"><span>allocator</span></span></a></div>
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</div>
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</td>
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<td>默认的分配器<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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