260 lines
26 KiB
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260 lines
26 KiB
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>uses_allocator_construction_args</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-memory.html"><memory></a></code></div>
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<div><code>T</code> 不是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化</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> T, <span class="kw1">class</span> Alloc, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> uses_allocator_construction_args<span class="br0">(</span> <span class="kw4">const</span> Alloc<span class="sy3">&</span> alloc,<br /></p>
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Args<span class="sy3">&&</span>... <span class="me1">args</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><code>T</code> 是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化</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> T, <span class="kw1">class</span> Alloc, <span class="kw1">class</span> Tuple1, <span class="kw1">class</span> Tuple2 <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> uses_allocator_construction_args<span class="br0">(</span> <span class="kw4">const</span> Alloc<span class="sy3">&</span> alloc,<br /></p>
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<a href="cpp-utility-piecewise_construct_t.html"><span class="kw1105">std::<span class="me2">piecewise_construct_t</span></span></a>, Tuple1<span class="sy3">&&</span> x, Tuple2<span class="sy3">&&</span> y<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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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> T, <span class="kw1">class</span> Alloc <span class="sy1">></span><br />
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> uses_allocator_construction_args<span class="br0">(</span> <span class="kw4">const</span> Alloc<span class="sy3">&</span> alloc <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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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> T, <span class="kw1">class</span> Alloc, <span class="kw1">class</span> U, <span class="kw1">class</span> V <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> uses_allocator_construction_args<span class="br0">(</span> <span class="kw4">const</span> Alloc<span class="sy3">&</span> alloc,<br /></p>
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U<span class="sy3">&&</span> u, V<span class="sy3">&&</span> v<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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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> T, <span class="kw1">class</span> Alloc, <span class="kw1">class</span> U, <span class="kw1">class</span> V <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> uses_allocator_construction_args<span class="br0">(</span> <span class="kw4">const</span> Alloc<span class="sy3">&</span> alloc,<br /></p>
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<span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1"><</span>U, V<span class="sy1">></span><span class="sy3">&</span> pr <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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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> T, <span class="kw1">class</span> Alloc, <span class="kw1">class</span> U, <span class="kw1">class</span> V <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> uses_allocator_construction_args<span class="br0">(</span> <span class="kw4">const</span> Alloc<span class="sy3">&</span> alloc,<br /></p>
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<a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1"><</span>U, V<span class="sy1">></span><span class="sy3">&&</span> pr<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(6)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>准备以<a href="cpp-memory-uses_allocator.html">使用分配器构造</a>的手段创建给定类型 <code>T</code> 对象所需的参数列表。</p>
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<div class="t-li1"><span class="t-li">1)</span> 此重载仅若 <code>T</code> 不是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化才参与重载决议。返回按下列方式确定的 <span class="t-lc"><a href="cpp-utility-tuple.html">std::tuple</a></span> ：
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<ul>
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<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-uses_allocator.html"><span class="kw705">std::<span class="me2">uses_allocator_v</span></span></a><span class="sy1"><</span>T, Alloc<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 而 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>T, Args...<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，则返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>Args<span class="sy1">></span><span class="br0">(</span>args<span class="br0">)</span>...<span class="br0">)</span></span></span></li>
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<li>否则，若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-uses_allocator.html"><span class="kw705">std::<span class="me2">uses_allocator_v</span></span></a><span class="sy1"><</span>T, Alloc<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 而 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>T, <a href="cpp-memory-allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a>, <span class="kw4">const</span> Alloc<span class="sy3">&</span>, Args...<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，则返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1"><</span><a href="cpp-memory-allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a>, <span class="kw4">const</span> Alloc<span class="sy3">&</span>, Args<span class="sy3">&&</span>...<span class="sy1">></span><span class="br0">(</span><a href="cpp-memory-allocator_arg.html"><span class="kw703">std::<span class="me2">allocator_arg</span></span></a>, alloc, <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>Args<span class="sy1">></span><span class="br0">(</span>args<span class="br0">)</span>...<span class="br0">)</span></span></span></li>
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<li>否则，若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-uses_allocator.html"><span class="kw705">std::<span class="me2">uses_allocator_v</span></span></a><span class="sy1"><</span>T, Alloc<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 而 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>T, Args..., <span class="kw4">const</span> Alloc<span class="sy3">&</span><span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，则返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>Args<span class="sy1">></span><span class="br0">(</span>args<span class="br0">)</span>..., alloc<span class="br0">)</span></span></span></li>
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<li>否则，程序非良构</li>
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</ul>
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</div>
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<div class="t-li1"><span class="t-li">2)</span> 此重载仅若 <code>T</code> 是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化才参与重载决议。对作为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1"><</span>T1, T2<span class="sy1">></span></span></span> 的 <code>T</code> 等价于
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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">return</span> <a href="cpp-utility-tuple-make_tuple.html"><span class="kw1112">std::<span class="me2">make_tuple</span></span></a><span class="br0">(</span> <a href="cpp-utility-piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>,
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<a href="cpp-utility-apply.html"><span class="kw1103">std::<span class="me2">apply</span></span></a><span class="br0">(</span> <span class="br0">[</span><span class="sy3">&</span>alloc<span class="br0">]</span><span class="br0">(</span><span class="kw4">auto</span><span class="sy3">&&</span>... <span class="me1">args1</span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">uses_allocator_construction_args</span><span class="sy1"><</span>T1<span class="sy1">></span><span class="br0">(</span> alloc,
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<a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span>args1<span class="br0">)</span><span class="sy1">></span><span class="br0">(</span>args1<span class="br0">)</span>...<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>, <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>Tuple1<span class="sy1">></span><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span>,
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<a href="cpp-utility-apply.html"><span class="kw1103">std::<span class="me2">apply</span></span></a><span class="br0">(</span> <span class="br0">[</span><span class="sy3">&</span>alloc<span class="br0">]</span><span class="br0">(</span><span class="kw4">auto</span><span class="sy3">&&</span>... <span class="me1">args2</span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw1">return</span> std<span class="sy4">::</span><span class="me2">uses_allocator_construction_args</span><span class="sy1"><</span>T2<span class="sy1">></span><span class="br0">(</span> alloc,
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<a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>decltype<span class="br0">(</span>args2<span class="br0">)</span><span class="sy1">></span><span class="br0">(</span>args2<span class="br0">)</span>...<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>, <a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>Tuple2<span class="sy1">></span><span class="br0">(</span>y<span class="br0">)</span><span class="br0">)</span>
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<span class="br0">)</span><span class="sy4">;</span></pre></div>
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</div>
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</div>
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<div class="t-li1"><span class="t-li">3)</span> 此重载仅若 <code>T</code> 是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化才参与重载决议。等价于
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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">return</span> std<span class="sy4">::</span><span class="me2">uses_allocator_construction_args</span><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span>alloc,
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<a href="cpp-utility-piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>, <a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1"><></span><span class="br0">{</span><span class="br0">}</span>, <a href="cpp-utility-tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1"><></span><span class="br0">{</span><span class="br0">}</span>
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<span class="br0">)</span><span class="sy4">;</span></pre></div>
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</div>
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</div>
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<div class="t-li1"><span class="t-li">4)</span> 此重载仅若 <code>T</code> 是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化才参与重载决议。等价于
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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">return</span> std<span class="sy4">::</span><span class="me2">uses_allocator_construction_args</span><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span> alloc,
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<a href="cpp-utility-piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>,
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<a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>U<span class="sy1">></span><span class="br0">(</span>u<span class="br0">)</span><span class="br0">)</span>,
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<a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>V<span class="sy1">></span><span class="br0">(</span>v<span class="br0">)</span><span class="br0">)</span>
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<span class="br0">)</span><span class="sy4">;</span></pre></div>
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</div>
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</div>
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<div class="t-li1"><span class="t-li">5)</span> 此重载仅若 <code>T</code> 是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化才参与重载决议。等价于
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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">return</span> std<span class="sy4">::</span><span class="me2">uses_allocator_construction_args</span><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span> alloc,
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<a href="cpp-utility-piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>,
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<a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span>pr.<span class="me1">first</span><span class="br0">)</span>,
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<a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span>pr.<span class="me1">second</span><span class="br0">)</span>
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<span class="br0">)</span><span class="sy4">;</span></pre></div>
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</div>
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</div>
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<div class="t-li1"><span class="t-li">6)</span> 此重载仅若 <code>T</code> 是 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的特化才参与重载决议。等价于
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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">return</span> std<span class="sy4">::</span><span class="me2">uses_allocator_construction_args</span><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span> alloc,
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<a href="cpp-utility-piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>,
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<a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">get</span><span class="sy1"><</span><span class="nu0">0</span><span class="sy1">></span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>pr<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span>,
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<a href="cpp-utility-tuple-forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">get</span><span class="sy1"><</span><span class="nu0">1</span><span class="sy1">></span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>pr<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</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.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>alloc</td>
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<td>-</td>
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<td>使用的分配器。</td>
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</tr>
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<tr class="t-par">
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<td>args</td>
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<td>-</td>
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<td>传递给 <code>T</code> 构造函数的参数。</td>
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</tr>
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<tr class="t-par">
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<td>x</td>
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<td>-</td>
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<td>传递给 <code>T</code> 的 <code>.first</code> 的构造函数的参数 <code>tuple</code> 。</td>
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</tr>
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<tr class="t-par">
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<td>y</td>
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<td>-</td>
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<td>传递给 <code>T</code> 的 <code>.second</code> 的构造函数的参数 <code>tuple</code> 。</td>
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</tr>
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<tr class="t-par">
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<td>u</td>
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<td>-</td>
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<td>传递给 <code>T</code> 的 <code>.first</code> 的构造函数的单个参数。</td>
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</tr>
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<tr class="t-par">
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<td>v</td>
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<td>-</td>
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<td>传递给 <code>T</code> 的 <code>.second</code> 的构造函数的单个参数。</td>
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</tr>
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<tr class="t-par">
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<td>pr</td>
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<td>-</td>
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<td><code>pair</code> ，将其 <code>.first</code> 传递给 <code>T</code> 的 <code>.first</code> 的构造函数，并将其 <code>.second</code> 传递给 <code>T</code> 的 <code>.second</code> 的构造函数的</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>适合于传递给 <code>T</code> 构造函数的参数的 <span class="t-lc"><a href="cpp-utility-tuple.html">std::tuple</a></span> 。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<tr>
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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</tr>
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</table>
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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>重载 <span class="t-v">(2-6)</span> 提供传入 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 的分配器传播，它们不支持前导分配器或尾随分配器约定（不同于如使用前导分配器约定的 <span class="t-lc"><a href="cpp-utility-tuple.html">std::tuple</a></span> ）。</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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<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-make_obj_using_allocator.html"><span class="t-lines"><span>make_obj_using_allocator</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>以使用分配器构造的手段创建给类型的对象<br />
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<span class="t-mark">(函数模板)</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-uninitialized_construct_using_allocator.html"><span class="t-lines"><span>uninitialized_construct_using_allocator</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>以使用分配器构造的手段在指定的内存位置创建给定类型的对象<br />
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<span class="t-mark">(函数模板)</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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