60 lines
5.8 KiB
HTML
60 lines
5.8 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::auto_ptr<T>::operator auto_ptr<Y></title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_auto_ptr_operator_auto_ptr skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::auto_ptr<T>::</span>operator auto_ptr<Y></h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-memory.html">memory</a>‎ | <a href="cpp-memory-auto_ptr.html">auto ptr</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"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Y <span class="sy1">></span><br />
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operator auto_ptr_ref<span class="sy1"><</span>Y<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="kw1">throw</span><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">(C++11 中弃用)</span><br />
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<span class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></td>
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<tr class="t-dcl t-until-cxx17">
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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> Y <span class="sy1">></span><br />
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operator auto_ptr<span class="sy1"><</span>Y<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="kw1">throw</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark">(C++11 中弃用)</span><br />
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<span class="t-mark-rev t-until-cxx17">(C++17 中移除)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>转换 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 为对于相异类型 <code>Y</code> 的 <code>auto_ptr</code> 。</p>
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<div class="t-li1"><span class="t-li">1)</span> 返回保有到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 引用的实现定义类型对象。 <span class="t-lc"><a href="cpp-memory-auto_ptr.html">std::auto_ptr</a></span> <a href="cpp-memory-auto_ptr-auto_ptr.html">可转换</a>并且<a href="cpp-memory-auto_ptr-operator=.html">可赋值</a>自此模板。允许实现以不同的名称提供该模板，或以其他方式实现等价的功能。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以调用 <span class="t-lc"><a href="cpp-memory-auto_ptr-release.html">release()</a></span> 获得的指针构造新的 <code>auto_ptr</code> 。</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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<p>（无）</p>
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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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<div class="t-li1"><span class="t-li">1)</span> 保有到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的引用的实现定义类型对象。</div>
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<div class="t-li1"><span class="t-li">2)</span> 拥有由调用 <span class="t-lc"><a href="cpp-memory-auto_ptr-release.html">release()</a></span> 获得的指针的 <code>auto_ptr</code> 。</div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>源自 <code>auto_ptr_ref</code> 的构造函数和复制赋值运算符允许从无名临时量复制构造和赋值 <span class="t-lc"><a href="cpp-memory-auto_ptr.html">std::auto_ptr</a></span> 。因为其复制构造函数与复制赋值运算符以非 const 引用接收参数，它们不能直接绑定右值。然而能执行<strong class="selflink">用户定义转换</strong>（释放原 <code>auto_ptr</code> ），之后再调用以值接收 <code>auto_ptr_ref</code> 的构造函数或复制赋值运算符。这是<a href="cpp-utility-move.html">移动语义</a>的早期实现。</p>
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