114 lines
7.8 KiB
HTML
114 lines
7.8 KiB
HTML
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<title>std::experimental::ranges::dangling, std::experimental::ranges::safe_iterator_t</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>dangling, <span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>safe_iterator_t</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-ranges.html">ranges</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-experimental-ranges-iterator.html"><experimental/ranges/iterator></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><a href="cpp-experimental-ranges-concepts-CopyConstructible.html"><span class="kw2551">ranges::<span class="me2">CopyConstructible</span></span></a> T<span class="sy1">></span><br /></span>
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<p><span class="kw1">class</span> dangling <span class="br0">{</span><br />
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<span class="kw1">public</span><span class="sy4">:</span><br />
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dangling<span class="br0">(</span><span class="br0">)</span> requires <a href="cpp-experimental-ranges-concepts-DefaultConstructible.html"><span class="kw2549">ranges::<span class="me2">DefaultConstructible</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span><br />
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dangling<span class="br0">(</span>T t<span class="br0">)</span><span class="sy4">;</span><br />
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T get_unsafe<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span><br /></p>
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<span class="br0">}</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><a href="cpp-experimental-ranges-range-Range.html"><span class="kw2588">ranges::<span class="me2">Range</span></span></a> R<span class="sy1">></span><br /></span>
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<p><span class="kw1">using</span> safe_iterator_t <span class="sy1">=</span> <a href="cpp-types-conditional.html"><span class="kw634">std::<span class="me2">conditional_t</span></span></a><span class="sy1"><</span><a href="cpp-types-is_lvalue_reference.html"><span class="kw464">std::<span class="me2">is_lvalue_reference</span></span></a><span class="sy1"><</span>R<span class="sy1">></span><span class="sy4">::</span><span class="me2">value</span>,<br />
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ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>R<span class="sy1">></span>,<br /></p>
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ranges<span class="sy4">::</span><span class="me2">dangling</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>R<span class="sy1">>></span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
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<p>类模板 <code>dangling</code> 是围绕对象的简单包装器，指示被包装对象可以<i>悬垂</i>，即它指代生存期可以已经结束的另一对象。</p>
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<p>若范围为右值范围，则别名模版 <code>safe_iterator_t</code> 返回包装于 <code>dangling</code> 中的 <code>R</code> 类型迭代器（以非左值引用类型的 <code>R</code> 指示）。</p>
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<p>接受左值范围并返回指向其中的迭代器范围算法使用它们。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<h2><span class="mw-headline" id="std::experimental::ranges::dangling::dangling"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::dangling::</span>dangling</span></h2>
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<div><span class="mw-geshi cpp source-cpp">dangling<span class="br0">(</span><span class="br0">)</span> requires <a href="cpp-experimental-ranges-concepts-DefaultConstructible.html"><span class="kw2549">ranges::<span class="me2">DefaultConstructible</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<div><span class="mw-geshi cpp source-cpp">dangling<span class="br0">(</span>T t<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数。值初始化被包装对象。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以 <code>t</code> 初始化被包装对象。注意此构造函数定义从 <code>T</code> 到 <code>dangling<T></code> 的隐式转换。</div>
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<h2><span class="mw-headline" id="std::experimental::ranges::dangling::get_unsafe"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::dangling::</span>get_unsafe</span></h2>
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<div><span class="mw-geshi cpp source-cpp">T get_unsafe<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<p>返回被包装对象的副本。</p>
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