67 lines
4.4 KiB
HTML
67 lines
4.4 KiB
HTML
<!DOCTYPE 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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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>C++ 关键词：class</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_keyword_class 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%">C++ 关键词：</span>class</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-keyword.html">keyword</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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<h3><span class="mw-headline" id=".E7.94.A8.E6.B3.95">用法</span></h3>
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<ul>
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<li><a href="cpp-language-class.html">声明类</a></li>
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</ul>
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<table class="t-rev-begin">
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<tr class="t-rev t-since-cxx11">
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<td>
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<ul>
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<li><a href="cpp-language-enum.html">声明有作用域枚举类型</a></li>
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</ul>
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</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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</table>
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<ul>
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<li>在<a href="cpp-language-templates.html">模板声明</a>中，<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span></span></span> 可用于引入<a href="cpp-language-template_parameters.html#.E7.B1.BB.E5.9E.8B.E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">类型模板形参</a>与<a href="cpp-language-template_parameters.html#.E6.A8.A1.E6.9D.BF.E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">模板模板形参</a></li>
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<li>若作用域中存在具有与某个类类型的名字相同的名字的函数或变量，则 <code>class</code> 可附于类名之前以消歧义，这产生一个<a href="cpp-language-elaborated_type_specifier.html">详述类型说明符</a></li>
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</ul>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">class</span> Foo<span class="sy4">;</span> <span class="co1">// 类的前置声明</span>
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<span class="kw1">class</span> Bar <span class="br0">{</span> <span class="co1">// 类的定义</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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Bar<span class="br0">(</span><span class="kw4">int</span> i<span class="br0">)</span> <span class="sy4">:</span> m_i<span class="br0">(</span>i<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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<span class="kw4">int</span> m_i<span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> T<span class="sy1">></span> <span class="co1">// 模板实参</span>
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<span class="kw4">void</span> qux<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
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T t<span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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Bar Bar<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">class</span> Bar Bar2<span class="br0">(</span><span class="nu0">2</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 详述的类型</span>
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<span class="br0">}</span></pre></div>
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</div>
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</div>
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