100 lines
10 KiB
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100 lines
10 KiB
HTML
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<title>std::experimental::function<R(Args...)>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_function_operator 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::experimental::function<R(Args...)>::</span>operator=</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-function.html">function</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">function<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> function<span class="sy3">&</span> other <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-libfund-ts t-mark-ts">(库基础 TS)</span></td>
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<div><span class="mw-geshi cpp source-cpp">function<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> function<span class="sy3">&&</span> other <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-libfund-ts t-mark-ts">(库基础 TS)</span></td>
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<div><span class="mw-geshi cpp source-cpp">function<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <a href="cpp-types-nullptr_t.html"><span class="kw102">std::<span class="me2">nullptr_t</span></span></a> <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-libfund-ts t-mark-ts">(库基础 TS)</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> F <span class="sy1">></span><br />
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function<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> F<span class="sy3">&&</span> f <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-libfund-ts t-mark-ts">(库基础 TS)</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> F <span class="sy1">></span><br />
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function<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <a href="cpp-utility-functional-reference_wrapper.html"><span class="kw1068">std::<span class="me2">reference_wrapper</span></span></a><span class="sy1"><</span>F<span class="sy1">></span> f <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-libfund-ts t-mark-ts">(库基础 TS)</span></td>
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<p>赋值新<i>目标</i>给 <code>std::experimental::function</code> 。在以下描述中，令 <span class="t-c"><span class="mw-geshi cpp source-cpp">ALLOCATOR_OF<span class="br0">(</span>f<span class="br0">)</span></span></span> 为 <code>f</code> 的构造中指定的分配器，或若未指定则为构造时 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="http://zh.cppreference.com/w/cpp/experimental/get_default_resource"><span class="kw2312">std::<span class="me2">experimental</span><span class="sy4">::</span><span class="me2">pmr</span><span class="sy4">::</span><span class="me2">get_default_resource</span></span></a><span class="br0">(</span><span class="br0">)</span></span></span> 的值。</p>
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<div class="t-li1"><span class="t-li">1)</span> 如同通过执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">function<span class="br0">(</span><a href="cpp-memory-allocator_arg.html"><span class="kw703">std::<span class="me2">allocator_arg</span></span></a>, ALLOCATOR_OF<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span>, other<span class="br0">)</span>.<span class="me1">swap</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">;</span></span></span> 赋值 <code>other</code> 的<i>目标</i>的副本。</div>
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<div class="t-li1"><span class="t-li">2)</span> 如同以执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">function<span class="br0">(</span><a href="cpp-memory-allocator_arg.html"><span class="kw703">std::<span class="me2">allocator_arg</span></span></a>, ALLOCATOR_OF<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span>, std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>other<span class="br0">)</span><span class="br0">)</span>.<span class="me1">swap</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">;</span></span></span> 移动 <code>other</code> 的<i>目标</i>到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 。 <code>other</code> 在合法状态并拥有未指定值。</div>
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<div class="t-li1"><span class="t-li">3)</span> 销毁 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的<i>目标</i>。调用后 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 为<i>空</i>。赋值后 <code>get_memory_resource()</code>所返回的内存资源等价于赋值前的内存资源，但地址可以更改。</div>
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<div class="t-li1"><span class="t-li">4)</span> 如同通过执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">function<span class="br0">(</span><a href="cpp-memory-allocator_arg.html"><span class="kw703">std::<span class="me2">allocator_arg</span></span></a>, ALLOCATOR_OF<span class="br0">(</span><span class="sy2">*</span>this<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>F<span class="sy1">></span><span class="br0">(</span>f<span class="br0">)</span><span class="br0">)</span>.<span class="me1">swap</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">;</span></span></span> 设置 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的<i>目标</i>为 <code>f</code> 。此运算符仅若 <code>f</code> 对参数类型 <code>Args...</code> 和返回类型 <code>R</code> <a href="cpp-named_req-Callable.html"><span style="font-style:italic">可调用</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Callable)</span></a> 才参与重载决议。</div>
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<div class="t-li1"><span class="t-li">5)</span> 如同通过执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">function<span class="br0">(</span><a href="cpp-memory-allocator_arg.html"><span class="kw703">std::<span class="me2">allocator_arg</span></span></a>, ALLOCATOR_OF<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span>, f<span class="br0">)</span>.<span class="me1">swap</span><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">;</span></span></span> 设置 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的<i>目标</i>为 <code>f</code> 的副本。</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>other</td>
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<td>-</td>
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<td>要复制或移动的另一 <code>std::experimental::function</code> 对象</td>
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<tr class="t-par">
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<td>f</td>
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<td>-</td>
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<td>要用以初始化<i>目标</i>的可调用对象</td>
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<td colspan="3">类型要求</td>
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<tr class="t-par-req">
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<td colspan="3">-
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<code>F</code> 必须满足<a href="cpp-named_req-Callable.html"><span style="font-style:italic">可调用</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Callable)</span></a> 的要求。</td>
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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><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<div class="t-li1"><span class="t-li">1-2,4-5)</span> （无）</div>
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