75 lines
8.2 KiB
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75 lines
8.2 KiB
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>Relation</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-concepts.html"><experimental/ranges/concepts></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> R, <span class="kw1">class</span> T, <span class="kw1">class</span> U<span class="sy1">></span><br /></span>
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<p>concept <span class="kw4">bool</span> Relation <span class="sy1">=</span><br />
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<a href="cpp-experimental-ranges-concepts-Predicate.html"><span class="kw2558">ranges::<span class="me2">Predicate</span></span></a><span class="sy1"><</span>R, T, T<span class="sy1">></span> <span class="sy3">&&</span><br />
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<a href="cpp-experimental-ranges-concepts-Predicate.html"><span class="kw2558">ranges::<span class="me2">Predicate</span></span></a><span class="sy1"><</span>R, U, U<span class="sy1">></span> <span class="sy3">&&</span><br />
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<a href="cpp-experimental-ranges-concepts-CommonReference.html"><span class="kw2533">ranges::<span class="me2">CommonReference</span></span></a><span class="sy1"><</span><br />
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<span class="kw4">const</span> <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 class="sy3">&</span>,<br />
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<span class="kw4">const</span> <a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span><span class="sy1">></span> <span class="sy3">&&</span><br />
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<a href="cpp-experimental-ranges-concepts-Predicate.html"><span class="kw2558">ranges::<span class="me2">Predicate</span></span></a><span class="sy1"><</span>R,<br />
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ranges<span class="sy4">::</span><span class="me2">common_reference_t</span><span class="sy1"><</span><br />
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<span class="kw4">const</span> <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 class="sy3">&</span>,<br />
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<span class="kw4">const</span> <a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span><span class="sy1">></span>,<br />
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ranges<span class="sy4">::</span><span class="me2">common_reference_t</span><span class="sy1"><</span><br />
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<span class="kw4">const</span> <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 class="sy3">&</span>,<br />
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<span class="kw4">const</span> <a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span><span class="sy1">>></span> <span class="sy3">&&</span><br />
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<a href="cpp-experimental-ranges-concepts-Predicate.html"><span class="kw2558">ranges::<span class="me2">Predicate</span></span></a><span class="sy1"><</span>R, T, U<span class="sy1">></span> <span class="sy3">&&</span><br /></p>
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<a href="cpp-experimental-ranges-concepts-Predicate.html"><span class="kw2558">ranges::<span class="me2">Predicate</span></span></a><span class="sy1"><</span>R, U, T<span class="sy1">></span><span class="sy4">;</span></div>
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<td>(1)</td>
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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>概念 <code>Relation<R, T, U></code> 指定 <code>R</code> 在类型和值类别由 <code>T</code> 或 <code>U</code> 编码的表达式集合上定义二元关系。</p>
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<p>给定</p>
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<li><code>r</code> ，有 <span class="t-c"><span class="mw-geshi cpp source-cpp">decltype<span class="br0">(</span><span class="br0">(</span>r<span class="br0">)</span><span class="br0">)</span></span></span> 为 <code>R</code> 的表达式，</li>
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<li><code>t</code> ，有 <span class="t-c"><span class="mw-geshi cpp source-cpp">decltype<span class="br0">(</span><span class="br0">(</span>t<span class="br0">)</span><span class="br0">)</span></span></span> 为 <code>T</code> 的表达式，</li>
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<li><code>u</code> ，有 <span class="t-c"><span class="mw-geshi cpp source-cpp">decltype<span class="br0">(</span><span class="br0">(</span>u<span class="br0">)</span><span class="br0">)</span></span></span> 为 <code>U</code> 的表达式，</li>
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<p>并令 <code>C</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">common_reference_t</span><span class="sy1"><</span><span class="kw4">const</span> <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 class="sy3">&</span>, <span class="kw4">const</span> <a href="cpp-types-remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1"><</span>U<span class="sy1">></span><span class="sy3">&</span><span class="sy1">></span></span></span> ，</p>
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<p>则 <code>Relation<R, T, U></code> 仅若</p>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span><span class="br0">(</span>r<span class="br0">(</span>t, u<span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw4">bool</span><span class="br0">(</span>r<span class="br0">(</span>C<span class="br0">(</span>t<span class="br0">)</span>, C<span class="br0">(</span>u<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span> 且</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span><span class="br0">(</span>r<span class="br0">(</span>u, t<span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw4">bool</span><span class="br0">(</span>r<span class="br0">(</span>C<span class="br0">(</span>u<span class="br0">)</span>, C<span class="br0">(</span>t<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span></li>
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<p>才得到满足</p>
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