76 lines
4.3 KiB
HTML
76 lines
4.3 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<title>std::indirect_result_t</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_iterator_indirect_result_t skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>indirect_result_t</h1>
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<div id="bodyContent">
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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 id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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<td>
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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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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx20">
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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>... <span class="me1">Is</span> <span class="sy1">></span><br /></span>
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<p> requires <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">indirectly_readable</span><span class="sy1"><</span>Is<span class="sy1">></span> <span class="sy3">&&</span> ...<span class="br0">)</span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">invocable</span><span class="sy1"><</span>F, std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1"><</span>Is<span class="sy1">></span>...<span class="sy1">></span><br /></p>
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<span class="kw1">using</span> indirect_result_t <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">invoke_result_t</span><span class="sy1"><</span>F, std<span class="sy4">::</span><span class="me2">iter_reference_t</span><span class="sy1"><</span>Is<span class="sy1">></span>...<span class="sy1">></span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>别名模板 <code>indirect_result_t</code> 获得在解引用 <a href="cpp-iterator-indirectly_readable.html"><code>indirectly_readable</code></a> 类型 <code>Is...</code> 的结果上调用 <a href="cpp-concepts-invocable.html"><code>invocable</code></a> 类型 <code>F</code> 的结果类型。</p>
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<h3><span class="mw-headline" id=".E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">模板形参</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>F</td>
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<td>-</td>
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<td>可调用类型</td>
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</tr>
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<tr class="t-par">
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<td>Is</td>
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<td>-</td>
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<td>解引用到实参的间接可读类型</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div">
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<div><a href="cpp-types-result_of.html"><span class="t-lines"><span>result_of</span><span>invoke_result</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</td>
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<td>推导以一组实参调用一个可调用对象的结果类型<br />
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<span class="t-mark">(类模板)</span></td>
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