57 lines
4.4 KiB
HTML
57 lines
4.4 KiB
HTML
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<title>std::experimental::ranges::Range</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>Range</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-range.html"><experimental/ranges/range></a></code></div>
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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> T <span class="sy1">></span><br /></span>
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<p>concept <span class="kw4">bool</span> Range <span class="sy1">=</span><br />
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requires<span class="br0">(</span>T<span class="sy3">&&</span> t<span class="br0">)</span> <span class="br0">{</span><br />
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ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>t<span class="br0">)</span><span class="sy4">;</span> <span class="coMULTI">/* 不必保持相等性（见后述） */</span><br />
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ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>t<span class="br0">)</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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<p>给定 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1"><</span>T<span class="sy1">></span></span></span> 类型左值 <code>t</code> ， <code>Range<T></code> 仅若下列条件成立才得到满足</p>
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<ul>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">[</span>ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>t<span class="br0">)</span>, ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>t<span class="br0">)</span><span class="br0">)</span></span></span> 代表一个范围；</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>t<span class="br0">)</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>t<span class="br0">)</span></span></span> 均为均摊常数时间且不修改内容。</li>
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<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>T<span class="sy1">></span></span></span> 满足<a href="cpp-experimental-ranges-iterator-ForwardIterator.html"><code>ForwardIterator</code></a>，则 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">begin</span><span class="br0">(</span>t<span class="br0">)</span></span></span> 保持相等性。</li>
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