134 lines
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134 lines
13 KiB
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<title>std::moneypunct<CharT,International>::positive_sign, do_positive_sign, negative_sign, do_negative_sign</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::moneypunct<CharT,International>::</span>positive_sign, do_positive_sign, negative_sign, do_negative_sign</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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">public</span><span class="sy4">:</span><br />
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string_type positive_sign<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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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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string_type negative_sign<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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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> string_type do_positive_sign<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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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> string_type do_negative_sign<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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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_positive_sign</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 公开成员函数，调用最终导出类的成员函数 <code>do_negative_sign</code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 返回用作正货币值格式化的字符串。</div>
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<div class="t-li1"><span class="t-li">3)</span> 返回用作负货币值格式化的字符串。</div>
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<p>只有返回字符串的首字符是出现于值 <span class="t-c"><span class="mw-geshi cpp source-cpp">sign</span></span> 所指示的 <span class="t-lc"><a href="cpp-locale-moneypunct-pos_format.html">pos_format()</a></span>/<span class="t-lc"><a href="cpp-locale-moneypunct-pos_format.html">neg_format()</a></span> 位置前的字符。剩下的字符出现在货币字符串的剩余部分之<i>后'。</i></p>
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<p>具体而言，对于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"-"</span></span></span> 的 negative_sign ，格式化可作为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"-1.23 €"</span></span></span> 出现，而对于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"()"</span></span></span> 的 negative_sign ，它会作为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"(1.23 €)"</span></span></span> 出现。</p>
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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>保有要用作正或负号的字符的 <code>string_type</code> 类型字符串。</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="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="kw1">struct</span> my_punct <span class="sy4">:</span> <a href="cpp-locale-moneypunct_byname.html"><span class="kw1982">std::<span class="me2">moneypunct_byname</span></span></a><span class="sy1"><</span><span class="kw4">char</span>, <span class="kw2">false</span><span class="sy1">></span> <span class="br0">{</span>
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my_punct<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> name<span class="br0">)</span> <span class="sy4">:</span> moneypunct_byname<span class="br0">(</span>name<span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span>
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string_type do_negative_sign<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="st0">"()"</span><span class="sy4">;</span> <span class="br0">}</span>
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<span class="br0">}</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> loc<span class="br0">(</span><span class="st0">"de_DE.utf8"</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="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> loc.<span class="me1">name</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" negative sign 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">negative_sign</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="sy2">-</span><span class="nu0">1234</span><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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<a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a> loc2<span class="br0">(</span><span class="st0">"ms_MY.utf8"</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="me1">imbue</span><span class="br0">(</span>loc2<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> loc2.<span class="me1">name</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" negative sign 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>loc2<span class="br0">)</span>.<span class="me1">negative_sign</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-put_money.html"><span class="kw1799">std::<span class="me2">put_money</span></span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu0">1234</span><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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<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><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="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span>, new my_punct<span class="br0">(</span><span class="st0">"de_DE.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="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"de_DE.utf8 with negative_sign set to <span class="es1">\"</span>()<span class="es1">\"</span>: "</span>
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<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="sy2">-</span><span class="nu0">1234</span><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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<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">de_DE.utf8 negative sign is '-' for example: -12,34 €
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ms_MY.utf8 negative sign is '()' for example: (RM12.34)
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de_DE.utf8 with negative_sign set to "()": (12,34 €)</pre></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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<div><a href="cpp-locale-moneypunct-pos_format.html"><span class="t-lines"><span>do_pos_format</span><span>do_neg_format</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>提供通货值的格式化模式<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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<div class="visualClear"></div>
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