79 lines
6.9 KiB
HTML
79 lines
6.9 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::experimental::ranges::reference_t, std::experimental::ranges::rvalue_reference_t, std::experimental::ranges::iter_common_reference_t</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_experimental_ranges_iterator_reference_t 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::experimental::ranges::</span>reference_t, <span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>rvalue_reference_t, <span style="font-size:0.7em; line-height:130%">std::experimental::ranges::</span>iter_common_reference_t</h1>
|
|
<div id="bodyContent">
|
|
<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>
|
|
<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-experimental-ranges-iterator.html"><experimental/ranges/iterator></a></code></div>
|
|
</td>
|
|
<td></td>
|
|
<td></td>
|
|
</tr>
|
|
<tr class="t-dcl">
|
|
<td class="t-dcl-nopad">
|
|
<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 />
|
|
concept <span class="kw4">bool</span> <span class="coMULTI">/*dereferenceable*/</span> <span class="sy1">=</span> requires<span class="br0">(</span>T<span class="sy3">&</span> t<span class="br0">)</span> <span class="br0">{</span> <span class="br0">{</span><span class="sy2">*</span>t<span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> <span class="kw4">auto</span><span class="sy3">&&</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span> <span class="co1">// 仅为说明</span></span></div>
|
|
</td>
|
|
<td class="t-dcl-nopad"></td>
|
|
<td class="t-dcl-nopad"></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-ranges">
|
|
<td>
|
|
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="coMULTI">/*dereferenceable*/</span> T <span class="sy1">></span><br />
|
|
<span class="kw1">using</span> reference_t <span class="sy1">=</span> decltype<span class="br0">(</span><span class="sy2">*</span>declval<span class="sy1"><</span>T<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></div>
|
|
</td>
|
|
<td>(1)</td>
|
|
<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-ranges">
|
|
<td>
|
|
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="coMULTI">/*dereferenceable*/</span> T <span class="sy1">></span><br /></span>
|
|
<p> requires requires<span class="br0">(</span>T<span class="sy3">&</span> t<span class="br0">)</span> <span class="br0">{</span> <span class="br0">{</span> ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>t<span class="br0">)</span> <span class="br0">}</span> <span class="sy2">-</span><span class="sy1">></span> <span class="kw4">auto</span><span class="sy3">&&</span><span class="sy4">;</span> <span class="br0">}</span><br /></p>
|
|
<span class="kw1">using</span> rvalue_reference_t <span class="sy1">=</span> decltype<span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">iter_move</span><span class="br0">(</span>declval<span class="sy1"><</span>T<span class="sy3">&</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></div>
|
|
</td>
|
|
<td>(2)</td>
|
|
<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl t-since-ranges">
|
|
<td>
|
|
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> Readable T <span class="sy1">></span><br /></span>
|
|
<p><span class="kw1">using</span> iter_common_reference_t <span class="sy1">=</span><br />
|
|
ranges<span class="sy4">::</span><span class="me2">common_reference_t</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">reference_t</span><span class="sy1"><</span>T<span class="sy1">></span>,<br /></p>
|
|
ranges<span class="sy4">::</span><span class="me2">value_type_t</span><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span><span class="sy1">></span><span class="sy4">;</span></div>
|
|
</td>
|
|
<td>(3)</td>
|
|
<td><span class="t-mark-rev t-since-ranges-ts t-mark-ts">(范围 TS)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl-sep">
|
|
<td></td>
|
|
<td></td>
|
|
<td></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<div class="t-li1"><span class="t-li">1)</span> 获得可解引用类型 <code>T</code> 的<i>引用类型</i>。</div>
|
|
<div class="t-li1"><span class="t-li">2)</span> 获得可解引用类型 <code>T</code> 的<i>右值引用类型</i>，即 <span class="t-lc">ranges::iter_move</span> 的返回类型。</div>
|
|
<div class="t-li1"><span class="t-li">3)</span> 计算 <a href="cpp-experimental-ranges-iterator-Readable.html"><code>Readable</code></a> 的<i>共用引用类型</i>。这是其引用类型及到其值类型的左值引用的共用引用类型。</div>
|
|
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
|
|
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="sy1">></span> <span class="kw4">auto</span><span class="sy3">&&</span></span></span> 制约检查表达式的类型是否非 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span></span></span> 。</p>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|