375 lines
21 KiB
HTML
375 lines
21 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::lconv</title>
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_locale_lconv 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::</span>lconv</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></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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<div>定义于头文件 <code><a href="cpp-header-clocale.html"><clocale></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">struct</span> lconv<span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td></td>
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<p>类 <code>std::lconv</code> 含有 C 本地环境定义的数值和货币格式化规则。此结构体的对象可由 <span class="t-lc"><a href="cpp-locale-localeconv.html">std::localeconv</a></span> 获得。 <code>std::lconv</code> 的成员为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 类型和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="sy2">*</span></span></span> 类型值。除了 <code>decimal_point</code> ，每个 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span><span class="sy2">*</span></span></span> 成员都可以指向空字符（即为空 C 字符串）。 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 类型成员均为非负数，而且若任一者在当前 C 本地环境中不可用，则为 <span class="t-lc"><a href="cpp-types-climits.html">CHAR_MAX</a></span> 。</p>
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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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<h4><span class="mw-headline" id=".E9.9D.9E.E8.B4.A7.E5.B8.81.E6.95.B0.E5.80.BC.E6.A0.BC.E5.BC.8F.E5.8C.96.E5.8F.82.E6.95.B0">非货币数值格式化参数</span></h4>
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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">char*</span> decimal_point</span></span></div>
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</div>
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</td>
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<td>用作小数点的字符<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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<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">char*</span> thousands_sep</span></span></div>
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</div>
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</td>
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<td>用于在小数点前分隔数位组的字符<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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<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">char*</span> grouping</span></span></div>
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</div>
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</td>
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<td>字符串，其元素指示数位组的大小<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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<h4><span class="mw-headline" id=".E8.B4.A7.E5.B8.81.E6.95.B0.E5.80.BC.E6.A0.BC.E5.BC.8F.E5.8C.96.E5.8F.82.E6.95.B0">货币数值格式化参数</span></h4>
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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">char*</span> mon_decimal_point</span></span></div>
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</div>
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</td>
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<td>用作小数点的字符<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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<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">char*</span> mon_thousands_sep</span></span></div>
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</div>
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</td>
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<td>用于在小数点前分隔数位组的字符<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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<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">char*</span> mon_grouping</span></span></div>
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</div>
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</td>
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<td>字符串，其元素指示数位组的大小<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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<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">char*</span> positive_sign</span></span></div>
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</div>
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</td>
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<td>用于指示非负货币量的字符串<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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<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">char*</span> negative_sign</span></span></div>
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</div>
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</td>
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<td>用于指示负货币量的字符串<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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<h4><span class="mw-headline" id=".E6.9C.AC.E5.9C.B0.E8.B4.A7.E5.B8.81.E6.95.B0.E5.80.BC.E6.A0.BC.E5.BC.8F.E5.8C.96.E5.8F.82.E6.95.B0">本地货币数值格式化参数</span></h4>
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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">char*</span> currency_symbol</span></span></div>
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</div>
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</td>
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<td>当前 C 本地环境中用于通货的符号<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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<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">char</span> frac_digits</span></span></div>
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</div>
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</td>
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<td>货币量中小数点后显示的位数<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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<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">char</span> p_cs_precedes</span></span></div>
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</div>
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</td>
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<td>若 currency_symbol 置于非负值前则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">1</span></span></span> ，于其后则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span><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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<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">char</span> n_cs_precedes</span></span></div>
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</div>
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</td>
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<td>若 currency_symbol 置于负值前则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">1</span></span></span> ，于其后则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span><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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<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">char</span> p_sep_by_space</span></span></div>
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</div>
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</td>
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<td>指示 <code>currency_symbol</code> 、 <code>positive_sign</code> 及非负货币值的分隔<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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<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">char</span> n_sep_by_space</span></span></div>
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</div>
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</td>
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<td>指示 <code>currency_symbol</code> 、 <code>positive_sign</code> 及负货币值的分隔<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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<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">char</span> p_sign_posn</span></span></div>
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</div>
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</td>
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<td>指示非负货币值中 <code>positive_sign</code> 的位置<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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<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">char</span> n_sign_posn</span></span></div>
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</div>
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</td>
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<td>指示负货币值中 <code>negative_sign</code> 的位置<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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<h4><span class="mw-headline" id=".E5.9B.BD.E9.99.85.E8.B4.A7.E5.B8.81.E6.95.B0.E5.80.BC.E6.A0.BC.E5.BC.8F.E5.8C.96.E5.8F.82.E6.95.B0">国际货币数值格式化参数</span></h4>
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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">char*</span> int_curr_symbol</span></span></div>
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</div>
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</td>
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<td>当前 C 本地环境中用作国际通货名的字符串<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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<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">char</span> int_frac_digits</span></span></div>
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</div>
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</td>
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<td>国际货币量中小数点后显示的位数<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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<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">char</span> int_p_cs_precedes</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>若 int_curr_symbol 置于非负值前则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">1</span></span></span> ，于其后则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span><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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<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">char</span> int_n_cs_precedes</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>若 int_curr_symbol 置于负值前则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">1</span></span></span> ，于其后则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span><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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<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">char</span> int_p_sep_by_space</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>指示 <code>int_curr_symbol</code> 、 <code>positive_sign</code> 及非负国际货币值的分隔<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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<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">char</span> int_n_sep_by_space</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>指示 <code>int_curr_symbol</code> 、 <code>positive_sign</code> 及负国际货币值的分隔<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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<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">char</span> int_p_sign_posn</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>指示非负国际货币值中 <code>positive_sign</code> 的位置<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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<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">char</span> int_n_sign_posn</span></span></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>指示负国际货币值中 <code>positive_sign</code> 的位置<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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<p><br />
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按照数值转译 <code>grouping</code> 和 <code>mon_grouping</code> 所指向的 C 字符串。遇到终止 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'<span class="es5">\0</span>'</span></span></span> 时，假设最后见到的值为剩下的数位重复。若遇到 <span class="t-lc"><a href="cpp-types-climits.html">CHAR_MAX</a></span> ，则不再将数位分组。典型的每次三位分组是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"<span class="es5">\003</span>"</span></span></span> 。</p>
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<p><code>p_sep_by_space</code> 、 <code>n_sep_by_space</code> 、 <code>int_p_sep_by_space</code> 、 <code>int_n_sep_by_space</code> 的值转译如下：</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>0</td>
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<td>通货符号和值间无空格分隔</td>
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</tr>
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<tr class="t-dsc">
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<td>1</td>
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<td>符号紧贴通货符号，值为空格所分隔</td>
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</tr>
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<tr class="t-dsc">
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<td>2</td>
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<td>符号紧贴值，通货符号为空格所分隔</td>
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</tr>
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</table>
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<p><code>p_sign_posn</code> 、 <code>n_sign_posn</code> 、 <code>int_p_sign_posn</code> 、 <code>int_n_sign_posn</code> 的值转译如下：</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>0</td>
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<td>括号围绕值，并用通货符号表示符号</td>
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</tr>
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<tr class="t-dsc">
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<td>1</td>
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<td>符号在值与通货符号前</td>
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</tr>
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<tr class="t-dsc">
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<td>2</td>
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<td>符号在值与通货符号后</td>
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</tr>
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<tr class="t-dsc">
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<td>3</td>
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<td>符号在通货符号前</td>
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</tr>
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<tr class="t-dsc">
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<td>4</td>
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<td>符号在通货符号后</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-template-editlink" style=""></div>
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<div class="t-example">
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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 <clocale></span>
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<span class="co2">#include <iostream></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-setlocale.html"><span class="kw1990">std::<span class="me2">setlocale</span></span></a><span class="br0">(</span><a href="cpp-locale-LC_categories.html"><span class="kw1992">LC_ALL</span></a>, <span class="st0">"ja_JP.UTF-8"</span><span class="br0">)</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">lconv</span><span class="sy2">*</span> lc <span class="sy1">=</span> <a href="cpp-locale-localeconv.html"><span class="kw1991">std::<span class="me2">localeconv</span></span></a><span class="br0">(</span><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">"Japanese currency symbol: "</span> <span class="sy1"><<</span> lc<span class="sy2">-</span><span class="sy1">></span>currency_symbol
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<span class="sy1"><<</span> <span class="st0">'('</span> <span class="sy1"><<</span> lc<span class="sy2">-</span><span class="sy1">></span>int_curr_symbol <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">Japanese currency symbol: ￥(JPY )</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-localeconv.html"><span class="t-lines"><span>localeconv</span></span></a></div>
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</div>
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</td>
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<td>查询当前本地环境的数值和货币格式化细节<br />
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<span class="t-mark">(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.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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<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-moneypunct.html"><span class="t-lines"><span>moneypunct</span></span></a></div>
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|
</div>
|
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</td>
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<td>定义 <span class="t-lc"><a href="cpp-locale-money_get.html">std::money_get</a></span> 与 <span class="t-lc"><a href="cpp-locale-money_put.html">std::money_put</a></span> 所用的货币格式解析器的参数<br />
|
|
<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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