112 lines
8.4 KiB
HTML
112 lines
8.4 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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<title>std::moneypunct<CharT,International>::decimal_point, do_decimal_point</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_locale_moneypunct_decimal_point skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::moneypunct<CharT,International>::</span>decimal_point, do_decimal_point</h1>
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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-moneypunct.html">moneypunct</a></span></div>
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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">public</span><span class="sy4">:</span><br />
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CharT decimal_point<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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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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<span class="kw1">virtual</span> CharT do_decimal_point<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td class="t-dcl-nopad"></td>
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<div class="t-li1"><span class="t-li">1)</span> 公开成员函数，调用最终导出类的成员函数 <code>do_decimal_point</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 返回用作货币 I/O 中小数点的字符，若格式使用小数（即若 <span class="t-lc"><a href="cpp-locale-moneypunct-frac_digits.html">do_frac_digits()</a></span> 大于零）。对于典型的美国本地环境，其为字符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'.'</span></span></span> （或 <span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">'.'</span></span></span> ）。</div>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>保有小数点的 <code>CharT</code> 类型值。</p>
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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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<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 <iomanip></span>
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<span class="co2">#include <locale></span>
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<span class="kw4">void</span> show_dpt<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> locname<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> loc<span class="br0">(</span>locname<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="me1">imbue</span><span class="br0">(</span>loc<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> locname <span class="sy1"><<</span> <span class="st0">" decimal point is '"</span>
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<span class="sy1"><<</span> <a href="cpp-locale-use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1"><</span><a href="cpp-locale-moneypunct.html"><span class="kw1972">std::<span class="me2">moneypunct</span></span></a><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">>></span><span class="br0">(</span>loc<span class="br0">)</span>.<span class="me1">decimal_point</span><span class="br0">(</span><span class="br0">)</span>
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<span class="sy1"><<</span> <span class="st0">"' for example: "</span> <span class="sy1"><<</span> <a href="cpp-io-manip-showbase.html"><span class="kw1766">std::<span class="me2">showbase</span></span></a> <span class="sy1"><<</span> <a href="cpp-io-manip-put_money.html"><span class="kw1799">std::<span class="me2">put_money</span></span></a><span class="br0">(</span><span class="nu0">123</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span><a href="cpp-locale-use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1"><</span><a href="cpp-locale-moneypunct.html"><span class="kw1972">std::<span class="me2">moneypunct</span></span></a><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">>></span><span class="br0">(</span>loc<span class="br0">)</span>.<span class="me1">frac_digits</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span><span class="br0">)</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">" (does not use frac digits) "</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">'<span class="es1">\n</span>'</span><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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show_dpt<span class="br0">(</span><span class="st0">"en_US.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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show_dpt<span class="br0">(</span><span class="st0">"ja_JP.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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show_dpt<span class="br0">(</span><span class="st0">"sv_SE.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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show_dpt<span class="br0">(</span><span class="st0">"de_DE.utf8"</span><span class="br0">)</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">en_US.utf8 decimal point is '.' for example: $1.23
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ja_JP.utf8 decimal point is '.' for example: ￥123 (does not use frac digits)
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sv_SE.utf8 decimal point is ',' for example: 1,23 kr
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de_DE.utf8 decimal point is ',' for example: 1,23 €</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-moneypunct-frac_digits.html"><span class="t-lines"><span>do_frac_digits</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>提供小数点后要显示的位数<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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</div>
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<div class="visualClear"></div>
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</body>
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