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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;scoped_allocator&gt;</h1>
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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;&#12290;</p>
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<h3><span class="mw-headline" id=".E7.B1.BB">&#31867;</span></h3>
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<div><a href="cpp-memory-scoped_allocator_adaptor.html"><span class="t-lines"><span>scoped_allocator_adaptor</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#20026;&#22810;&#32423;&#23481;&#22120;&#23454;&#29616;&#30340;&#22810;&#32423;&#20998;&#37197;&#22120;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">&#20989;&#25968;</span></h3>
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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>
<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>
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<td>&#27604;&#36739;&#20004;&#20010; scoped_allocator_adaptor &#23454;&#20363;<br />
<span class="t-mark">(<code>std::scoped_allocator_adaptor&lt;OuterAlloc,InnerAlloc...&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="co1">// &#31867;&#27169;&#26495; scoped_allocator_adaptor</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OuterAlloc, <span class="kw1">class</span>... <span class="me1">InnerAlloc</span><span class="sy1">&gt;</span>
<span class="kw1">class</span> scoped_allocator_adaptor<span class="sy4">;</span>
<span class="co1">// &#26377;&#20316;&#29992;&#22495;&#20998;&#37197;&#22120;&#36816;&#31639;&#31526;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OuterA1, <span class="kw1">class</span> OuterA2, <span class="kw1">class</span>... <span class="me1">InnerAllocs</span><span class="sy1">&gt;</span>
<span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> scoped_allocator_adaptor<span class="sy1">&lt;</span>OuterA1, InnerAllocs...<span class="sy1">&gt;</span><span class="sy3">&amp;</span> a,
<span class="kw4">const</span> scoped_allocator_adaptor<span class="sy1">&lt;</span>OuterA2, InnerAllocs...<span class="sy1">&gt;</span><span class="sy3">&amp;</span> b<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::scoped_allocator_adaptor">&#31867;&#27169;&#26495; <span class="t-lc"><a href="cpp-memory-scoped_allocator_adaptor.html">std::scoped_allocator_adaptor</a></span></span></h4>
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<div class="cpp source-cpp">
<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OuterAlloc, <span class="kw1">class</span>... <span class="me1">InnerAllocs</span><span class="sy1">&gt;</span>
<span class="kw1">class</span> scoped_allocator_adaptor <span class="sy4">:</span> <span class="kw1">public</span> OuterAlloc <span class="br0">{</span>
<span class="kw1">private</span><span class="sy4">:</span>
<span class="kw1">using</span> OuterTraits <span class="sy1">=</span> allocator_traits<span class="sy1">&lt;</span>OuterAlloc<span class="sy1">&gt;</span><span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
scoped_allocator_adaptor<span class="sy1">&lt;</span>InnerAllocs...<span class="sy1">&gt;</span> inner<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="kw1">using</span> outer_allocator_type <span class="sy1">=</span> OuterAlloc<span class="sy4">;</span>
<span class="kw1">using</span> inner_allocator_type <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">using</span> value_type <span class="sy1">=</span> <span class="kw1">typename</span> OuterTraits<span class="sy4">::</span><span class="me2">value_type</span><span class="sy4">;</span>
<span class="kw1">using</span> size_type <span class="sy1">=</span> <span class="kw1">typename</span> OuterTraits<span class="sy4">::</span><span class="me2">size_type</span><span class="sy4">;</span>
<span class="kw1">using</span> difference_type <span class="sy1">=</span> <span class="kw1">typename</span> OuterTraits<span class="sy4">::</span><span class="me2">difference_type</span><span class="sy4">;</span>
<span class="kw1">using</span> pointer <span class="sy1">=</span> <span class="kw1">typename</span> OuterTraits<span class="sy4">::</span><span class="me2">pointer</span><span class="sy4">;</span>
<span class="kw1">using</span> const_pointer <span class="sy1">=</span> <span class="kw1">typename</span> OuterTraits<span class="sy4">::</span><span class="me2">const_pointer</span><span class="sy4">;</span>
<span class="kw1">using</span> void_pointer <span class="sy1">=</span> <span class="kw1">typename</span> OuterTraits<span class="sy4">::</span><span class="me2">void_pointer</span><span class="sy4">;</span>
<span class="kw1">using</span> const_void_pointer <span class="sy1">=</span> <span class="kw1">typename</span> OuterTraits<span class="sy4">::</span><span class="me2">const_void_pointer</span><span class="sy4">;</span>
<span class="kw1">using</span> propagate_on_container_copy_assignment <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">using</span> propagate_on_container_move_assignment <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">using</span> propagate_on_container_swap <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">using</span> is_always_equal <span class="sy1">=</span> <span class="coMULTI">/* &#35265;&#25551;&#36848; */</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> Tp<span class="sy1">&gt;</span> <span class="kw1">struct</span> rebind <span class="br0">{</span>
<span class="kw1">using</span> other <span class="sy1">=</span> scoped_allocator_adaptor<span class="sy1">&lt;</span>
OuterTraits<span class="sy4">::</span><span class="kw1">template</span> rebind_alloc<span class="sy1">&lt;</span>Tp<span class="sy1">&gt;</span>, InnerAllocs...<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
scoped_allocator_adaptor<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OuterA2<span class="sy1">&gt;</span>
scoped_allocator_adaptor<span class="br0">(</span>OuterA2<span class="sy3">&amp;&amp;</span> outerAlloc,
<span class="kw4">const</span> InnerAllocs<span class="sy3">&amp;</span>... <span class="me1">innerAllocs</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
scoped_allocator_adaptor<span class="br0">(</span><span class="kw4">const</span> scoped_allocator_adaptor<span class="sy3">&amp;</span> other<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
scoped_allocator_adaptor<span class="br0">(</span>scoped_allocator_adaptor<span class="sy3">&amp;&amp;</span> other<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OuterA2<span class="sy1">&gt;</span>
scoped_allocator_adaptor<span class="br0">(</span>
<span class="kw4">const</span> scoped_allocator_adaptor<span class="sy1">&lt;</span>OuterA2, InnerAllocs...<span class="sy1">&gt;</span><span class="sy3">&amp;</span> other<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OuterA2<span class="sy1">&gt;</span>
scoped_allocator_adaptor<span class="br0">(</span>
scoped_allocator_adaptor<span class="sy1">&lt;</span>OuterA2, InnerAllocs...<span class="sy1">&gt;</span><span class="sy3">&amp;&amp;</span> other<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
scoped_allocator_adaptor<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> scoped_allocator_adaptor<span class="sy3">&amp;</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
scoped_allocator_adaptor<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span>scoped_allocator_adaptor<span class="sy3">&amp;&amp;</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span>
~scoped_allocator_adaptor<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
inner_allocator_type<span class="sy3">&amp;</span> inner_allocator<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">const</span> inner_allocator_type<span class="sy3">&amp;</span> inner_allocator<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
outer_allocator_type<span class="sy3">&amp;</span> outer_allocator<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">const</span> outer_allocator_type<span class="sy3">&amp;</span> outer_allocator<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</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> pointer allocate<span class="br0">(</span>size_type n<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> pointer allocate<span class="br0">(</span>size_type n, const_void_pointer hint<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">void</span> deallocate<span class="br0">(</span>pointer p, size_type n<span class="br0">)</span><span class="sy4">;</span>
size_type max_size<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span><span class="sy1">&gt;</span>
<span class="kw4">void</span> construct<span class="br0">(</span>T<span class="sy2">*</span> p, Args<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> T<span class="sy1">&gt;</span>
<span class="kw4">void</span> destroy<span class="br0">(</span>T<span class="sy2">*</span> p<span class="br0">)</span><span class="sy4">;</span>
scoped_allocator_adaptor select_on_container_copy_construction<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> OuterAlloc, <span class="kw1">class</span>... <span class="me1">InnerAllocs</span><span class="sy1">&gt;</span>
scoped_allocator_adaptor<span class="br0">(</span>OuterAlloc, InnerAllocs...<span class="br0">)</span>
<span class="sy2">-</span><span class="sy1">&gt;</span> scoped_allocator_adaptor<span class="sy1">&lt;</span>OuterAlloc, InnerAllocs...<span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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