klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
90010113ddacfb181cc4cfa007fb53634e2bc12c
hustoj/web/cppreference-zh/chmhelp/cpp-iterator-counted_iterator-operator_cmp2.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

87 lines
6.7 KiB
HTML
Raw Blame History

<!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>operator==(std::counted_iterator&lt;I&gt;, std::default_sentinel_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_iterator_counted_iterator_operator_cmp2 skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading">operator==<small>(std::counted_iterator&lt;I&gt;, std::default_sentinel_t)</small></h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-iterator.html">iterator</a>&lrm; | <a href="cpp-iterator-counted_iterator.html">counted iterator</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-dcl t-since-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><br />
&nbsp; <span class="kw4">const</span> counted_iterator<span class="sy3">&amp;</span> x, std<span class="sy4">::</span><span class="me2">default_sentinel_t</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#26816;&#26597;&#24213;&#23618;<i>&#38271;&#24230;</i>&#65288;&#21363;&#21040;&#26411;&#23614;&#30340;&#36317;&#31163;&#65289;&#26159;&#21542;&#31561;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#12290;</p>
<p>&#27492;&#20989;&#25968;&#27169;&#26495;&#23545;&#36890;&#24120;<a href="cpp-language-unqualified_lookup.html">&#26080;&#38480;&#23450;</a>&#25110;<a href="cpp-language-qualified_lookup.html">&#26377;&#38480;&#23450;&#26597;&#25214;</a>&#19981;&#21487;&#35265;&#65292;&#32780;&#21482;&#33021;&#22312; <code>std::counted_iterator&lt;I&gt;</code> &#20026;&#21442;&#25968;&#30340;&#20851;&#32852;&#31867;&#26102;&#30001;<a href="cpp-language-adl.html">&#23454;&#21442;&#20381;&#36182;&#26597;&#25214;</a>&#25214;&#21040;&#12290;</p>
<p><code>!=</code> &#36816;&#31639;&#31526;&#20174; <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">&#21512;&#25104;</a>&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>x</td>
<td>-</td>
<td>&#36845;&#20195;&#22120;&#36866;&#37197;&#22120;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span></span></span> &#31561;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65292;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;initializer_list&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> <span class="kw4">auto</span> v <span class="sy1">=</span> <span class="br0">{</span><span class="nu0">1</span>, <span class="nu0">2</span>, <span class="nu0">3</span>, <span class="nu0">4</span><span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="sy1">&lt;</span><a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">iterator</span><span class="sy1">&gt;</span>
it1 <span class="br0">{</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">3</span><span class="br0">}</span>,
it2 <span class="br0">{</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, <span class="nu0">0</span><span class="br0">}</span><span class="sy4">;</span>
static_assert<span class="br0">(</span> it1 <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="br0">)</span><span class="sy4">;</span>
static_assert<span class="br0">(</span> it2 <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="br0">)</span><span class="sy4">;</span>
static_assert<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="sy3">!</span><span class="sy1">=</span> it1 <span class="br0">)</span><span class="sy4">;</span>
static_assert<span class="br0">(</span> std<span class="sy4">::</span><span class="me2">default_sentinel</span> <span class="sy1">==</span> it2 <span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-counted_iterator-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator&lt;=&gt;</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
</div>
</td>
<td>&#27604;&#36739;&#21040;&#26411;&#23614;&#30340;&#36317;&#31163;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink