88 lines
5.6 KiB
HTML
88 lines
5.6 KiB
HTML
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<title>std::experimental::observer_ptr<W>::observer_ptr</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_observer_ptr_observer_ptr 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::observer_ptr<W>::</span>observer_ptr</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-observer_ptr.html">observer ptr</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> observer_ptr<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span><br />
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<span class="kw4">constexpr</span> observer_ptr<span class="br0">(</span> nullptr_t <span class="br0">)</span> <span class="kw1">noexcept</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-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw1">explicit</span> observer_ptr<span class="br0">(</span> element_type<span class="sy2">*</span> p <span class="br0">)</span> <span class="kw1">noexcept</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-2 t-mark-ts">(库基础 TS v2)</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> W2<span class="sy1">></span><br />
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<span class="kw4">constexpr</span> observer_ptr<span class="br0">(</span> observer_ptr<span class="sy1"><</span>W2<span class="sy1">></span> other <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-2 t-mark-ts">(库基础 TS v2)</span></td>
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<div><span class="mw-geshi cpp source-cpp">observer_ptr<span class="br0">(</span> <span class="kw4">const</span> observer_ptr<span class="sy3">&</span> other <span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</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-2 t-mark-ts">(库基础 TS v2)</span><br />
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<span class="t-mark">(隐式声明)</span></td>
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<div><span class="mw-geshi cpp source-cpp">observer_ptr<span class="br0">(</span> observer_ptr<span class="sy3">&&</span> other <span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</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-2 t-mark-ts">(库基础 TS v2)</span><br />
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<span class="t-mark">(隐式声明)</span></td>
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<td></td>
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<div class="t-li1"><span class="t-li">1)</span> 构造无对应被查看对象的 <code>observer_ptr</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 构造查看 <code>p</code> 的 <code>observer_ptr</code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 构造查看 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span> 的 <code>observer_ptr</code> 。此重载仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp">W2<span class="sy2">*</span></span></span> 可转换为 <span class="t-c"><span class="mw-geshi cpp source-cpp">element_type<span class="sy2">*</span></span></span> 才参与重载决议。</div>
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<div class="t-li1"><span class="t-li">4-5)</span> 隐式声明的复制和移动构造函数。构造查看 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span> 的 <code>observer_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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<td>p</td>
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<td>-</td>
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<td>指向要查看的对象的指针</td>
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<td>other</td>
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<td>-</td>
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<td>要复制的另一 <code>observer_ptr</code></td>
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