55 lines
3.9 KiB
HTML
55 lines
3.9 KiB
HTML
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>indirect_unary_predicate</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-iterator.html">iterator</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-iterator.html"><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><span class="kw1">class</span> F, <span class="kw1">class</span> I<span class="sy1">></span><br /></span>
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<p>concept indirect_unary_predicate <span class="sy1">=</span><br />
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std<span class="sy4">::</span><span class="me2">indirectly_readable</span><span class="sy1"><</span>I<span class="sy1">></span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">copy_constructible</span><span class="sy1"><</span>F<span class="sy1">></span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">predicate</span><span class="sy1"><</span>F<span class="sy3">&</span>, std<span class="sy4">::</span><span class="me2">iter_value_t</span><span class="sy1"><</span>I<span class="sy1">></span><span class="sy3">&</span><span class="sy1">></span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">predicate</span><span class="sy1"><</span>F<span class="sy3">&</span>, std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1"><</span>I<span class="sy1">>></span> <span class="sy3">&&</span><br /></p>
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std<span class="sy4">::</span><span class="me2">predicate</span><span class="sy1"><</span>F<span class="sy3">&</span>, std<span class="sy4">::</span><span class="me2">iter_common_reference_t</span><span class="sy1"><</span>I<span class="sy1">>></span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>概念 <code>indirect_unary_predicate</code> 指定调用作为其参数的一元谓词的算法的要求。此概念与 <span class="t-lc">std::predicate</span> 的关键区别是它被应用到 <code>I</code> 所引用的类型，而非 <code>I</code> 自身。</p>
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<h3><span class="mw-headline" id=".E8.AF.AD.E4.B9.89.E8.A6.81.E6.B1.82">语义要求</span></h3>
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<p><code>F</code> 与 <code>I</code> 实现 <code>indirect_unary_predicate</code> ，仅若其所蕴含的所有概念均得到实现。</p>
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