158 lines
12 KiB
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158 lines
12 KiB
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<title>std::moneypunct<CharT,International>::pos_format, do_pos_format, neg_format, do_neg_format</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::moneypunct<CharT,International>::</span>pos_format, do_pos_format, neg_format, do_neg_format</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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pattern pos_format<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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pattern neg_format<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> pattern do_pos_format<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> pattern do_neg_format<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_pos_format</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_neg_format</code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 返回（ <a href="cpp-locale-money_base.html"><tt>std::money_base::format</tt></a> 类型）描述正货币值格式化的格式结构。</div>
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<div class="t-li1"><span class="t-li">4)</span> 返回（ <a href="cpp-locale-money_base.html"><tt>std::money_base::format</tt></a> 类型）描述负货币值格式化的格式结构。</div>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-locale-moneypunct.html"><span class="kw1972">std::<span class="me2">moneypunct</span></span></a></span></span> 的标准特化返回模式 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">{</span>symbol, sign, none, value<span class="br0">}</span></span></span> 。</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>描述此 locale 所用的格式化的 <a href="cpp-locale-money_base.html"><tt>std::money_base::format</tt></a> 类型对象。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p><span class="t-lc"><a href="cpp-locale-money_put.html">std::money_put</a></span> 用 <code>pos_format</code> 格式化正值，用 <code>neg_format</code> 格式化负值，然而 <span class="t-lc"><a href="cpp-locale-money_get.html">std::money_get</a></span> 用 <code>neg_format</code> 分析所有货币值：它假定 <code>neg_format</code> 与 <code>pos_format</code> 兼容。</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="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <locale></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <iomanip></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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pattern do_pos_format<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="br0">{</span> <span class="br0">{</span>value, space, symbol, sign<span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span><span class="br0">}</span>
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pattern do_neg_format<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span> <span class="kw1">return</span> <span class="br0">{</span> <span class="br0">{</span>value, space, symbol, sign<span class="br0">}</span> <span class="br0">}</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-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><span class="st0">"en_US.utf8"</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">"american locale: "</span> <span class="sy1"><<</span> <a href="cpp-io-manip-showbase.html"><span class="kw1766">std::<span class="me2">showbase</span></span></a>
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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="nu16">12345678.0</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">"en_US.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">"locale with modified moneypunct:<span class="es1">\n</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="nu16">12345678.0</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</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="nu16">12345678.0</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 class="text source-text">
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<pre class="de1">american locale: $123,456.78
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locale with modified moneypunct:
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123,456.78 $
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123,456.78 $-</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 class="t-dsc-member-div">
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<div><a href="cpp-locale-moneypunct-curr_symbol.html"><span class="t-lines"><span>do_curr_symbol</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>提供用作通货标识符的字符串<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="t-dsc-member-div">
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<div><a href="cpp-locale-moneypunct-positive_sign.html"><span class="t-lines"><span>do_positive_sign</span><span>do_negative_sign</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>提供指示正或负值的字符串<br />
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<span class="t-mark">(虚受保护成员函数)</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><a href="cpp-locale-money_get-get.html"><span class="t-lines"><span>do_get</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>分析来自输入流的货币值<br />
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<span class="t-mark">(<code>std::money_get<CharT,InputIt></code> 的虚受保护成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-money_put-put.html"><span class="t-lines"><span>do_put</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>格式化货币值并写入到输出流<br />
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<span class="t-mark">(<code>std::money_put<CharT,OutputIt></code> 的虚受保护成员函数)</span></td>
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