107 lines
8.6 KiB
HTML
107 lines
8.6 KiB
HTML
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<title>std::numpunct<CharT>::truename, do_truename, falsename, do_falsename</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::numpunct<CharT>::</span>truename, do_truename, falsename, do_falsename</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-numpunct.html">numpunct</a></span></div>
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<table class="t-dcl-begin">
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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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">public</span><span class="sy4">:</span><br />
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string_type truename<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">public</span><span class="sy4">:</span><br />
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string_type falsename<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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<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_truename<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(3)</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> string_type do_falsename<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<div class="t-li1"><span class="t-li">1-2)</span> 公开成员函数，分别调用最终导出类的成员函数 <code>do_truename</code> 和 <code>do_falsename</code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 返回拥有表示布尔值 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 的字符串。</div>
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<div class="t-li1"><span class="t-li">4)</span> 返回拥有表示布尔值 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 的字符串。</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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<div class="t-li1"><span class="t-li">1,3)</span> 用作 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 表示的 <code>string_type</code> 类型对象。 <code>std::numpunct</code> 的标准特化返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"true"</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">"true"</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2,4)</span> 用作 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 表示的 <code>string_type</code> 类型对象。 <code>std::numpunct</code> 的标准特化返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"false"</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">"false"</span></span></span> 。</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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<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="co2">#include <iomanip></span>
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<span class="kw1">struct</span> custom_tf <span class="sy4">:</span> <a href="cpp-locale-numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> <span class="br0">{</span>
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<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> do_truename<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">"t"</span><span class="sy4">;</span> <span class="br0">}</span>
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<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> do_falsename<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">"f"</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="sy1"><<</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a><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">"default locale: "</span> <span class="sy1"><<</span> <span class="kw2">true</span> <span class="sy1"><<</span> <span class="kw2">true</span> <span class="sy1"><<</span> <span class="kw2">false</span> <span class="sy1"><<</span> <span class="kw2">false</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 custom_tf<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 numpunct: "</span>
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<span class="sy1"><<</span> <span class="kw2">true</span> <span class="sy1"><<</span> <span class="kw2">true</span> <span class="sy1"><<</span> <span class="kw2">false</span> <span class="sy1"><<</span> <span class="kw2">false</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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</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: truetruefalsefalse
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locale with modified numpunct: ttff</pre></div>
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