50 lines
2.7 KiB
HTML
50 lines
2.7 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
|
|
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<title>std::relation</title>
|
|
<link rel="stylesheet" href="ext.css" />
|
|
<link rel="stylesheet" href="site_modules.css" />
|
|
</head>
|
|
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_concepts_relation skin-cppreference2 action-view cpp-navbar">
|
|
<div id="cpp-content-base">
|
|
<div id="content"><a id="top"></a>
|
|
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>relation</h1>
|
|
<div id="bodyContent">
|
|
<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-concepts.html">concepts</a></span></div>
|
|
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
|
|
<table class="t-dcl-begin">
|
|
<tbody>
|
|
<tr class="t-dsc-header">
|
|
<td>
|
|
<div>定义于头文件 <code><a href="cpp-header-concepts.html"><concepts></a></code></div>
|
|
</td>
|
|
<td></td>
|
|
<td></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-cxx20">
|
|
<td>
|
|
<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>
|
|
<p>concept relation <span class="sy1">=</span><br />
|
|
std<span class="sy4">::</span><span class="me2">predicate</span><span class="sy1"><</span>R, T, T<span class="sy1">></span> <span class="sy3">&&</span> std<span class="sy4">::</span><span class="me2">predicate</span><span class="sy1"><</span>R, U, U<span class="sy1">></span> <span class="sy3">&&</span><br /></p>
|
|
std<span class="sy4">::</span><span class="me2">predicate</span><span class="sy1"><</span>R, T, U<span class="sy1">></span> <span class="sy3">&&</span> std<span class="sy4">::</span><span class="me2">predicate</span><span class="sy1"><</span>R, U, T<span class="sy1">></span><span class="sy4">;</span></div>
|
|
</td>
|
|
<td class="t-dcl-nopad"></td>
|
|
<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl-sep">
|
|
<td></td>
|
|
<td></td>
|
|
<td></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>概念 <code>relation<R, T, U></code> 指定 <code>R</code> 定义在类型和值类别为 <code>T</code> 或 <code>U</code> 所编码的表达式上的二元关系。</p>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|