313 lines
17 KiB
HTML
313 lines
17 KiB
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::numpunct_byname</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_locale_numpunct_byname 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%">std::</span>numpunct_byname</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-locale.html">locale</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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<table class="t-dcl-begin">
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<td>
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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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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> CharT <span class="sy1">></span><br />
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<span class="kw1">class</span> numpunct_byname <span class="sy4">:</span> <span class="kw1">public</span> <a href="cpp-locale-numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span><span class="sy4">;</span></span></div>
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<p><span class="t-lc"><strong class="selflink">std::numpunct_byname</strong></span> 是 <span class="t-lc"><a href="cpp-locale-numpunct.html">std::numpunct</a></span> 平面，它封装在其构造时指定的 locale 的数值标点偏好。</p>
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<p>标准库提供二个特化</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc-header">
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<td colspan="2">
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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>
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</tr>
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<tr class="t-dsc">
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">numpunct_byname</span><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span></span></span></td>
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<td>窄字符 I/O 的本地环境限定 <span class="t-lc"><a href="cpp-locale-numpunct.html">std::numpunct</a></span> 平面</td>
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</tr>
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<tr class="t-dsc">
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">numpunct_byname</span><span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span></span></span></td>
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<td>宽字符 I/O 的本地环境限定 <span class="t-lc"><a href="cpp-locale-numpunct.html">std::numpunct</a></span> 平面</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>成员类型</td>
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<td>定义</td>
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<tr class="t-dsc">
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<td><code>char_type</code></td>
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<td><code>CharT</code></td>
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</tr>
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<tr class="t-dsc">
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<td><code>string_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span></span></span></td>
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</tr>
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</table>
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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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<table class="t-dsc-begin">
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><strong class="selflink"><span class="t-lines"><span>(构造函数)</span></span></strong></div>
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</div>
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</td>
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<td>构造新的 <code>numpunct_byname</code> 平面<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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<tr class="t-dsc">
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><strong class="selflink"><span class="t-lines"><span>(析构函数)</span></span></strong></div>
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</div>
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</td>
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<td>析构 <code>numpunct_byname</code> 平面<br />
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<span class="t-mark">(受保护成员函数)</span></td>
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</tr>
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</table>
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<div class="t-template-editlink" style=""></div>
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<div class="t-member">
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<h2><span class="mw-headline" id="std::numpunct_byname::numpunct_byname"><span style="font-size:0.7em; line-height:130%">std::numpunct_byname::</span>numpunct_byname</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> numpunct_byname<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> name, <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></span></div>
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<td class="t-dcl-nopad"></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> numpunct_byname<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy3">&</span> name, <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></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>为名为 <code>name</code> 的本地环境构造新的 <code>std::numpunct_byname</code> 平面。</p>
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<p><code>refs</code> 用于资源管理：在销毁最后一个保有平面的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a></span></span> 对象时，若 <span class="t-c"><span class="mw-geshi cpp source-cpp">refs <span class="sy1">==</span> <span class="nu0">0</span></span></span> ，则实现销毁平面对象。否则，不销毁对象。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>name</td>
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<td>-</td>
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<td>本地环境的名称</td>
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</tr>
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<tr class="t-par">
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<td>refs</td>
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<td>-</td>
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<td>链接到该平面的引用数</td>
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</tr>
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</table>
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</div>
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<div class="t-template-editlink" style=""></div>
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<div class="t-member">
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<h2><span class="mw-headline" id="std::numpunct_byname::.7Enumpunct_byname"><span style="font-size:0.7em; line-height:130%">std::numpunct_byname::</span>~numpunct_byname</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br />
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~numpunct_byname<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td class="t-dcl-nopad"></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</table>
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<p>销毁平面。</p>
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</div>
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<div class="t-template-editlink" style=""></div>
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<div class="t-inherited">
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<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::numpunct">继承自 <a href="cpp-locale-numpunct.html"><span style="font-size:0.7em; line-height:130%">std::</span>numpunct</a></span></h2>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B_2">成员类型</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>成员类型</td>
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<td>定义</td>
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</tr>
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<tr class="t-dsc">
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<td><code>char_type</code></td>
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<td><code>charT</code></td>
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</tr>
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<tr class="t-dsc">
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<td><code>string_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1"><</span>charT<span class="sy1">></span></span></span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_2">成员函数</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-decimal_point.html"><span class="t-lines"><span>decimal_point</span></span></a></div>
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</div>
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</td>
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<td>调用 <code>do_decimal_point</code><br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-thousands_sep.html"><span class="t-lines"><span>thousands_sep</span></span></a></div>
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</div>
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</td>
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<td>调用 <code>do_thousands_sep</code><br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-grouping.html"><span class="t-lines"><span>grouping</span></span></a></div>
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</div>
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</td>
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<td>调用 <code>do_grouping</code><br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-truefalsename.html"><span class="t-lines"><span>truename</span><span>falsename</span></span></a></div>
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</div>
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</td>
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<td>调用 <code>do_truename</code> 或 <code>do_falsename</code><br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的公开成员函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.97.E4.BF.9D.E6.8A.A4.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">受保护成员函数</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-decimal_point.html"><span class="t-lines"><span>do_decimal_point</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>提供用作小数点的字符<br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的虚受保护成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-thousands_sep.html"><span class="t-lines"><span>do_thousands_sep</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>提供用作千分隔符的字符<br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的虚受保护成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-grouping.html"><span class="t-lines"><span>do_grouping</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>提供一对千分隔符之间的位数<br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的虚受保护成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct-truefalsename.html"><span class="t-lines"><span>do_truename</span><span>do_falsename</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>提供用作布尔 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 名称的字符串<br />
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<span class="t-mark">(<code>std::numpunct<CharT></code> 的虚受保护成员函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.AF.B9.E8.B1.A1">成员对象</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span><span class="t-dsc-small">static std::locale::id</span> id</span></span></div>
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</div>
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</td>
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<td>locale 的 <i>id</i><br />
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<span class="t-mark">(公开成员对象)</span></td>
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</tr>
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</table>
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</div>
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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>此示例演示如何应用另一语言的数值标点规则而不更改 locale 的剩余部分。</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="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">const</span> <span class="kw4">double</span> number <span class="sy1">=</span> <span class="nu16">1000.25</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1759">std::<span class="me2">wcout</span></span></a> <span class="sy1"><<</span> L<span class="st0">"default locale: "</span> <span class="sy1"><<</span> number <span class="sy1"><<</span> L<span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1759">std::<span class="me2">wcout</span></span></a>.<span class="me1">imbue</span><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><a href="cpp-io-cout.html"><span class="kw1759">std::<span class="me2">wcout</span></span></a>.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span>,
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new std<span class="sy4">::</span><span class="me2">numpunct_byname</span><span class="sy1"><</span><span class="kw4">wchar_t</span><span class="sy1">></span><span class="br0">(</span><span class="st0">"ru_RU.UTF8"</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1759">std::<span class="me2">wcout</span></span></a> <span class="sy1"><<</span> L<span class="st0">"default locale with russian numpunct: "</span> <span class="sy1"><<</span> number <span class="sy1"><<</span> L<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">default locale: 1000.25
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default locale with russian numpunct: 1 000,25</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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-numpunct.html"><span class="t-lines"><span>numpunct</span></span></a></div>
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</div>
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</td>
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<td>定义数值标点规则<br />
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<span class="t-mark">(类模板)</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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</div>
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</div>
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</body>
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</html>
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