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<title>std::numpunct&lt;CharT&gt;::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&lt;CharT&gt;::</span>truename, do_truename, falsename, do_falsename</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-locale.html">locale</a>&lrm; | <a href="cpp-locale-numpunct.html">numpunct</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-locale.html">&lt;locale&gt;</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 />
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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">public</span><span class="sy4">:</span><br />
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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br />
<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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br />
<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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<div class="t-li1"><span class="t-li">1-2)</span> &#20844;&#24320;&#25104;&#21592;&#20989;&#25968;&#65292;&#20998;&#21035;&#35843;&#29992;&#26368;&#32456;&#23548;&#20986;&#31867;&#30340;&#25104;&#21592;&#20989;&#25968; <code>do_truename</code> &#21644; <code>do_falsename</code> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#36820;&#22238;&#25317;&#26377;&#34920;&#31034;&#24067;&#23572;&#20540; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#30340;&#23383;&#31526;&#20018;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#36820;&#22238;&#25317;&#26377;&#34920;&#31034;&#24067;&#23572;&#20540; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#30340;&#23383;&#31526;&#20018;&#12290;</div>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1,3)</span> &#29992;&#20316; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#34920;&#31034;&#30340; <code>string_type</code> &#31867;&#22411;&#23545;&#35937;&#12290; <code>std::numpunct</code> &#30340;&#26631;&#20934;&#29305;&#21270;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&quot;true&quot;</span></span></span> &#21644; <span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">&quot;true&quot;</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2,4)</span> &#29992;&#20316; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#34920;&#31034;&#30340; <code>string_type</code> &#31867;&#22411;&#23545;&#35937;&#12290; <code>std::numpunct</code> &#30340;&#26631;&#20934;&#29305;&#21270;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&quot;false&quot;</span></span></span> &#21644; <span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">&quot;false&quot;</span></span></span> &#12290;</div>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
<span class="co2">#include &lt;iomanip&gt;</span>
<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">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> <span class="br0">{</span>
<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">&quot;t&quot;</span><span class="sy4">;</span> <span class="br0">}</span>
<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">&quot;f&quot;</span><span class="sy4">;</span> <span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;default locale: &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="kw2">true</span> <span class="sy1">&lt;&lt;</span> <span class="kw2">true</span> <span class="sy1">&lt;&lt;</span> <span class="kw2">false</span> <span class="sy1">&lt;&lt;</span> <span class="kw2">false</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<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>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;locale with modified numpunct: &quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="kw2">true</span> <span class="sy1">&lt;&lt;</span> <span class="kw2">true</span> <span class="sy1">&lt;&lt;</span> <span class="kw2">false</span> <span class="sy1">&lt;&lt;</span> <span class="kw2">false</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">default locale: truetruefalsefalse
locale with modified numpunct: ttff</pre></div>
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