56 lines
4.7 KiB
HTML
56 lines
4.7 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::experimental::ranges::Sentinel</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_Sentinel 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>Sentinel</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 t-since-ranges">
|
|
<td>
|
|
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw1">class</span> S, <span class="kw1">class</span> I <span class="sy1">></span><br /></span>
|
|
<p>concept <span class="kw4">bool</span> Sentinel <span class="sy1">=</span><br />
|
|
<a href="cpp-experimental-ranges-concepts-Semiregular.html"><span class="kw2554">ranges::<span class="me2">Semiregular</span></span></a><span class="sy1"><</span>S<span class="sy1">></span> <span class="sy3">&&</span> <a href="cpp-experimental-ranges-iterator-Iterator.html"><span class="kw2566">ranges::<span class="me2">Iterator</span></span></a><span class="sy1"><</span>I<span class="sy1">></span> <span class="sy3">&&</span><br /></p>
|
|
<a href="cpp-experimental-ranges-concepts-WeaklyEqualityComparableWith.html"><span class="kw2542">ranges::<span class="me2">WeaklyEqualityComparableWith</span></span></a><span class="sy1"><</span>S, I<span class="sy1">></span><span class="sy4">;</span></div>
|
|
</td>
|
|
<td class="t-dcl-nopad"></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>
|
|
<p><code>Sentinel</code> 概念描述其值代表范围的 <a href="cpp-experimental-ranges-iterator-Iterator.html"><code>Iterator</code></a> 类型与 <a href="cpp-experimental-ranges-concepts-Semiregular.html"><code>Semiregular</code></a> 类型间的关系。</p>
|
|
<p>令 <code>s</code> 与 <code>i</code> 分别表示 <code>S</code> 与 <code>I</code> 类型的值，使得 <code>[i, s)</code> 代表范围。 <code>Sentinel<S, I></code> 仅若下列条件成立才得到满足：</p>
|
|
<ul>
|
|
<li><span class="t-c"><span class="mw-geshi cpp source-cpp">i <span class="sy1">==</span> s</span></span> 为良定义。</li>
|
|
<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span><span class="br0">(</span>i <span class="sy3">!</span><span class="sy1">=</span> s<span class="br0">)</span></span></span> 则 <code>i</code> 可解引用且 <code>[++i, s)</code> 代表范围。</li>
|
|
</ul>
|
|
<p><code>==</code> 能随时间而更改。给定迭代器 <code>i</code> 和哨位 <code>s</code> 并使得 <code>[i, s)</code> 代表范围且 <span class="t-c"><span class="mw-geshi cpp source-cpp">i <span class="sy3">!</span><span class="sy1">=</span> s</span></span> ，不要求自增任何等于 <code>i</code> 的迭代器后 <code>[i, s)</code> 继续代表范围（从而这种自增后不再要求 <span class="t-c"><span class="mw-geshi cpp source-cpp">i <span class="sy1">==</span> s</span></span> 是良定义的）。</p>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|