94 lines
10 KiB
HTML
94 lines
10 KiB
HTML
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<title>std::experimental::unique_resource<R, D>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_unique_resource_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::unique_resource<R, D>::</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-unique_resource.html">unique resource</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div><span class="mw-geshi cpp source-cpp">unique_resource<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> unique_resource<span class="sy3">&&</span> other <span class="br0">)</span><br />
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<span class="kw1">noexcept</span><span class="br0">(</span><span class="coMULTI">/*see below*/</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-libfund-ts-3 t-mark-ts">(库基础 TS v3)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>移动赋值运算符。以 <code>other</code> 的被管理资源替换被管理资源。</p>
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<p>正式而言，令 <code>RS</code> 为存储的资源柄的类型：</p>
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<ul>
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<li>首先，调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">reset<span class="br0">(</span><span class="br0">)</span></span></span> 释放当前占有的资源，若存在。</li>
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<li>然后以 <code>other</code> 的存储的资源柄与删除器赋值存储的资源柄与删除器。若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>RS<span class="sy1">></span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>D<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> ，则分别应用 <code>std::move</code> 到 <code>other</code> 的存储的资源柄或删除器。首先执行存储的资源柄的赋值，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>D<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_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>RS<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> 。</li>
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<li>最后，设置 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 为占有资源当且仅当赋值前 <code>other</code> 占有它，并设置 <code>other</code> 为不占有资源。</li>
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</ul>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>RS<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 <code>RS</code> 应当满足<a href="cpp-named_req-MoveAssignable.html"><span style="font-style:italic">可移动赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveAssignable)</span></a> 要求；否则 <code>RS</code> 应当满足<a href="cpp-named_req-CopyAssignable.html"><span style="font-style:italic">可复制赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyAssignable)</span></a> 要求。若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>D<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 <code>D</code> 应当满足<a href="cpp-named_req-MoveAssignable.html"><span style="font-style:italic">可移动赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveAssignable)</span></a> 要求；否则 <code>D</code> 应当满足<a href="cpp-named_req-CopyAssignable.html"><span style="font-style:italic">可复制赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyAssignable)</span></a> 要求。不满足上述要求导致未定义行为。</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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<table class="t-par-begin">
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<td>other</td>
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<td>-</td>
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<td>将要被转移所有权的资源包装</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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<p>任何复制赋值中抛出的异常。</p>
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<div class="t-noexcept-full"><a href="cpp-language-noexcept_spec.html"><tt>noexcept</tt></a> 说明：
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<div class="t-noexcept-box"><span class="t-cc"><span class="mw-geshi cpp source-cpp"><span class="kw1">noexcept</span><span class="br0">(</span><a href="cpp-types-is_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>RS<span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-types-is_move_assignable.html"><span class="kw561">std::<span class="me2">is_nothrow_move_assignable_v</span></span></a><span class="sy1"><</span>D<span class="sy1">></span><span class="br0">)</span></span></span></div>
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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>若复制成员抛出异常，则此机制置 <code>other</code> 于不变并使 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 在被释放状态。</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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<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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<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-experimental-unique_resource-reset.html"><span class="t-lines"><span>reset</span></span></a></div>
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</div>
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<td>释放或替换被管理的资源<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-unique_ptr-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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<td>为<code>unique_ptr</code>赋值<br />
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<span class="t-mark">(<code>std::unique_ptr<T,Deleter></code> 的公开成员函数)</span></td>
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</div>
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