130 lines
16 KiB
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130 lines
16 KiB
HTML
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<title>std::experimental::unique_resource<R, D>::unique_resource</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_unique_resource_unique_resource 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>unique_resource</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><span class="mw-geshi cpp source-cpp">unique_resource<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> RR, <span class="kw1">class</span> DD<span class="sy1">></span><br />
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unique_resource<span class="br0">(</span> RR<span class="sy3">&&</span> r, DD<span class="sy3">&&</span> d <span class="br0">)</span> <span class="kw1">noexcept</span><span class="br0">(</span><span class="coMULTI">/*see below*/</span><span class="br0">)</span></span></div>
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<td>(2)</td>
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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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<div><span class="mw-geshi cpp source-cpp">unique_resource<span class="br0">(</span> unique_resource<span class="sy3">&&</span> other <span class="br0">)</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-3 t-mark-ts">(库基础 TS v3)</span></td>
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<p>为解释目的使用下列项目：</p>
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<ul>
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<li><code>RS</code> 为存储的资源柄的类型。</li>
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<li>表达式 <span class="t-c"><span class="mw-geshi cpp source-cpp">res_</span></span> 指代底层资源柄。</li>
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<li><code>del_</code> 指代删除器对象。</li>
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</ul>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数。值初始化存储的资源柄与删除器。构造的的 <code>unique_resource</code> 不拥有资源。</div>
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<div class="t-li1"><span class="t-li"></span> 此重载仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_default_constructible.html"><span class="kw527">std::<span class="me2">is_default_constructible_v</span></span></a><span class="sy1"><</span>R<span class="sy1">></span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_default_constructible.html"><span class="kw527">std::<span class="me2">is_default_constructible_v</span></span></a><span class="sy1"><</span>D<span class="sy1">></span></span></span> 均为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 才参与重载决议。</div>
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<div class="t-li1"><span class="t-li">2)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>RS, RR<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> 则以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>RR<span class="sy1">></span><span class="br0">(</span>r<span class="br0">)</span></span></span> ，否则以 <span class="t-c"><span class="mw-geshi cpp source-cpp">r</span></span> 初始化存储的资源柄。若存储的资源柄的初始化抛异常，则调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">d<span class="br0">(</span>r<span class="br0">)</span></span></span> 。<br />
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然后，若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>D, DD<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> 则以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>DD<span class="sy1">></span><span class="br0">(</span>d<span class="br0">)</span></span></span> ，否则以 <span class="t-c"><span class="mw-geshi cpp source-cpp">d</span></span> 初始化删除器。若删除器的初始化跑一次，则调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">d<span class="br0">(</span>res_<span class="br0">)</span></span></span> 。<br />
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构造的 <code>unique_resource</code> 占有资源。</div>
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<div class="t-li1"><span class="t-li"></span> 此重载仅若 <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>RS, RR<span class="sy1">></span></span></span> 、 <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>D , DD<span class="sy1">></span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>RS, RR<span class="sy1">></span> <span class="sy3">||</span> <a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>RS, RR<span class="sy3">&</span><span class="sy1">></span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>D, DD<span class="sy1">></span> <span class="sy3">||</span> <a href="cpp-types-is_constructible.html"><span class="kw521">std::<span class="me2">is_constructible_v</span></span></a><span class="sy1"><</span>D, DD<span class="sy3">&</span><span class="sy1">></span></span></span> 都为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 才参与重载决议。</div>
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<div class="t-li1"><span class="t-li"></span> 若表达式 <span class="t-c"><span class="mw-geshi cpp source-cpp">d<span class="br0">(</span>r<span class="br0">)</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">d<span class="br0">(</span>res_<span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">del_<span class="br0">(</span>res_<span class="br0">)</span></span></span> 的任一者为谬构，则程序为谬构。</div>
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<div class="t-li1"><span class="t-li"></span> 若表达式 <span class="t-c"><span class="mw-geshi cpp source-cpp">d<span class="br0">(</span>r<span class="br0">)</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp">d<span class="br0">(</span>res_<span class="br0">)</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">del_<span class="br0">(</span>res_<span class="br0">)</span></span></span> 的任一者导致未定义行为或抛异常，则行为未定义。</div>
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<div class="t-li1"><span class="t-li">3)</span> 移动构造函数。用 <code>other</code> 的存储的资源柄初始化存储的资源柄，若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_constructible.html"><span class="kw543">std::<span class="me2">is_nothrow_move_constructible_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> 则使用 <code>std::move</code> 。若底层资源柄的初始化抛异常，则不修改 <code>other</code> 。<br />
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然后，用 <code>other</code> 的删除器初始化删除器，若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_constructible.html"><span class="kw543">std::<span class="me2">is_nothrow_move_constructible_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> 则使用 <code>std::move</code> 。若删除器的初始化抛异常且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_move_constructible.html"><span class="kw543">std::<span class="me2">is_nothrow_move_constructible_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> 而 <code>other</code> 占有资源，则以 <span class="t-c"><span class="mw-geshi cpp source-cpp">res_</span></span> 调用 <code>other</code> 的删除器释放资源，然后调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">release</span><span class="br0">(</span><span class="br0">)</span></span></span> 。<br />
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构造后，构造的 <code>unique_resource</code> 占有资源当且仅当 <code>other</code> 在构造前占有资源，并设置 <code>other</code> 为不占有资源。</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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<td>r</td>
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<td>-</td>
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<td>资源柄</td>
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</tr>
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<tr class="t-par">
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<td>d</td>
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<td>-</td>
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<td>用于释放资源的删除器</td>
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</tr>
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<tr class="t-par">
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<td>other</td>
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<td>-</td>
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<td>要获得其所有权的 <code>unique_resource</code></td>
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</tr>
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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>任何初始化存储的资源柄或删除器时抛出的异常。</p>
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<div class="t-li1"><span class="t-li">2)</span>
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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><span class="br0">(</span><br /></span></span>
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<p> <a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>RS, RR<span class="sy1">></span> <span class="sy3">||</span> <a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>RS, RR<span class="sy3">&</span><span class="sy1">></span><br />
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<span class="br0">)</span> <span class="sy3">&&</span><br />
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<span class="br0">(</span><br />
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<a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>D, DD<span class="sy1">></span> <span class="sy3">||</span> <a href="cpp-types-is_constructible.html"><span class="kw525">std::<span class="me2">is_nothrow_constructible_v</span></span></a><span class="sy1"><</span>D, DD<span class="sy3">&</span><span class="sy1">></span><br /></p>
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<span class="br0">)</span><span class="br0">)</span></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>
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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><br /></span></span>
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<p> <a href="cpp-types-is_move_constructible.html"><span class="kw543">std::<span class="me2">is_nothrow_move_constructible_v</span></span></a><span class="sy1"><</span>R1<span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-types-is_move_constructible.html"><span class="kw543">std::<span class="me2">is_nothrow_move_constructible_v</span></span></a><span class="sy1"><</span>D<span class="sy1">></span><br /></p>
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<span class="br0">)</span></div>
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</div>
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</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>这些构造函数的机制确保无资源泄漏。</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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<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 t-dsc-member-nobold-div">
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<div><a href="cpp-memory-unique_ptr-unique_ptr.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>构造新的<code>unique_ptr</code><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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</tr>
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</table>
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</div>
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