111 lines
7.0 KiB
HTML
111 lines
7.0 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>std::locale::id</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_locale_locale_id skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::locale::</span>id</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-locale.html">locale</a>‎ | <a href="cpp-locale-locale.html">locale</a></span></div>
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<table class="t-dcl-begin">
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<div>定义于头文件 <code><a href="cpp-header-locale.html"><locale></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> locale<span class="sy4">::</span><span class="me2">id</span><span class="sy4">;</span></span></div>
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<p>类 <span class="t-lc"><strong class="selflink">std::locale::id</strong></span> 提供本地环境片面的实现限定标识。每个导出自 <span class="t-lc"><a href="cpp-locale-locale-facet.html">std::locale::facet</a></span> 的类都必须拥有名为 <code><b>id</b></code> 的 <span class="t-lc"><strong class="selflink">std::locale::id</strong></span> 类型公开静态成员，而每个 <span class="t-lc"><a href="cpp-locale-locale.html">std::locale</a></span> 对象维护其所实装的 facet 列表，以其 <code>id</code> 索引。</p>
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<p>拥有相同 <code>id</code> 的 facet 属于同一平面类别，并且在添加到 locale 对象时彼此替换。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-locale-locale-id-id.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造新的 id<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span>operator=</span></span></div>
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</div>
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</td>
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<td>复制赋值运算符被删除<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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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="t-example">
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<p>下列代码展示如何构造最小的定制 facet 。</p>
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <locale></span>
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<span class="kw1">struct</span> myfacet <span class="sy4">:</span> <a href="cpp-locale-locale-facet.html"><span class="kw1895">std::<span class="me2">locale</span><span class="sy4">::</span><span class="me2">facet</span></span></a>
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<span class="br0">{</span>
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myfacet<span class="br0">(</span><a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> refs <span class="sy1">=</span> <span class="nu0">0</span><span class="br0">)</span> <span class="sy4">:</span> facet<span class="br0">(</span>refs<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
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<span class="kw4">static</span> std<span class="sy4">::</span><span class="me2">locale</span><span class="sy4">::</span><span class="me2">id</span> id<span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">locale</span><span class="sy4">::</span><span class="me2">id</span> myfacet<span class="sy4">::</span><span class="me2">id</span><span class="sy4">;</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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<a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a> myloc<span class="br0">(</span><a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="br0">)</span>, new myfacet<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"has_facet<myfacet>(myloc) returns "</span> <span class="sy1"><<</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a>
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<span class="sy1"><<</span> <a href="cpp-locale-has_facet.html"><span class="kw1897">std::<span class="me2">has_facet</span></span></a><span class="sy1"><</span>myfacet<span class="sy1">></span><span class="br0">(</span>myloc<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">has_facet<myfacet>(myloc) returns true</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-locale-facet.html"><span class="t-lines"><span>facet</span></span></a></div>
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</div>
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</td>
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<td>所有平面分类的分类：任何分类的每个 facet 都从此类型导出<br />
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<span class="t-mark">(类)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</body>
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</html>
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