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<title>std::numpunct&lt;CharT&gt;::grouping, std::numpunct&lt;CharT&gt;::do_grouping</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>grouping, <span style="font-size:0.7em; line-height:130%">std::numpunct&lt;CharT&gt;::</span>do_grouping</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 />
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> grouping<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> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> do_grouping<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> &#20844;&#24320;&#25104;&#21592;&#20989;&#25968;&#65292;&#35843;&#29992;&#26368;&#32456;&#23548;&#20986;&#31867;&#30340;&#25104;&#21592;&#20989;&#25968; <code>do_grouping</code> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#36820;&#22238; <span class="t-lc"><a href="cpp-string-basic_string.html">std::string</a></span> &#65292;&#20854;&#27599;&#20010; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> &#20803;&#32032;&#20013;&#20445;&#26377; <a href="cpp-locale-num_put-put.html"><tt>num_put::put()</tt></a> &#65288;&#20174;&#32780;&#36824;&#26377; <a href="cpp-io-basic_ostream-operator_ltlt.html"><tt>basic_ostream::operator&lt;&lt;</tt></a> &#65289;&#25152;&#26684;&#24335;&#21270;&#30340;&#25968;&#20540;&#36755;&#20986;&#30340;&#27599;&#32452;&#20301;&#25968;&#12290;</div>
<p>&#32452;&#20197;&#20108;&#36827;&#21046;&#20540;&#23384;&#20648;&#65306;&#19977;&#20301;&#32452;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&#39;<span class="es5">\3</span>&#39;</span></span></span> &#65292;&#32780; 51 &#20301;&#32452;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&#39;3&#39;</span></span></span> &#12290;&#36820;&#22238;&#30340;&#23383;&#31526;&#20018;&#30340;&#20301;&#20110;&#38646;&#19979;&#26631;&#30340;&#23383;&#31526;&#65292;&#20445;&#26377;&#26368;&#21491;&#32452;&#20013;&#30340;&#20301;&#25968;&#12290;&#20301;&#20110; 1 &#19979;&#26631;&#30340;&#23383;&#31526;&#20445;&#26377;&#31532;&#20108;&#21491;&#30340;&#32452;&#20013;&#30340;&#20301;&#25968;&#65292;&#31561;&#31561;&#12290;&#36820;&#22238;&#23383;&#31526;&#20018;&#20013;&#30340;&#26368;&#21518;&#23383;&#31526;&#25152;&#25351;&#31034;&#30340;&#20998;&#32452;&#34987;&#22797;&#29992;&#20110;&#25968;&#65288;&#30340;&#24038;&#37096;&#20998;&#65289;&#20013;&#25152;&#26377;&#21097;&#20313;&#25968;&#20301;&#30340;&#20998;&#32452;&#12290;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#20445;&#26377;&#20998;&#32452;&#30340; <span class="t-lc"><a href="cpp-string-basic_string.html">std::string</a></span> &#31867;&#22411;&#23545;&#35937;&#12290; <code>std::numpunct</code> &#30340;&#26631;&#20934;&#29305;&#21270;&#36820;&#22238;&#31354;&#23383;&#31526;&#20018;&#65292;&#25351;&#31034;&#26080;&#20998;&#32452;&#12290;&#20856;&#22411;&#20998;&#32452;&#65288;&#20363;&#22914; <code>en_US</code> &#26412;&#22320;&#29615;&#22659;&#65289;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&quot;<span class="es5">\003</span>&quot;</span></span></span> &#12290;</p>
<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;limits&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
<span class="kw1">struct</span> space_out <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>
<span class="kw4">char</span> do_thousands_sep<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">&#39; &#39;</span><span class="sy4">;</span> <span class="br0">}</span> <span class="co1">// &#20197;&#31354;&#26684;&#20998;&#38548;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> do_grouping<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;<span class="es5">\1</span>&quot;</span><span class="sy4">;</span> <span class="br0">}</span> <span class="co1">// 1 &#20301;&#32452;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="kw1">struct</span> g123 <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_grouping<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;<span class="es5">\1</span><span class="es5">\2</span><span class="es5">\3</span>&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> <span class="st0">&quot;default locale: &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="nu0">12345678</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 space_out<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="nu0">12345678</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 g123<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 <span class="es1">\\</span>1<span class="es1">\\</span>2<span class="es1">\\</span>3 grouping: &quot;</span> <span class="sy1">&lt;&lt;</span>
<a href="cpp-types-numeric_limits.html"><span class="kw344">std::<span class="me2">numeric_limits</span></span></a><span class="sy1">&lt;</span><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">max</span><span class="br0">(</span><span class="br0">)</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: 12345678
locale with modified numpunct: 1 2 3 4 5 6 7 8
Locale with \1\2\3 grouping: 18,446,744,073,709,551,61,5</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-locale-numpunct-thousands_sep.html"><span class="t-lines"><span>do_thousands_sep</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
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<td>&#25552;&#20379;&#29992;&#20316;&#21315;&#20998;&#38548;&#31526;&#30340;&#23383;&#31526;<br />
<span class="t-mark">(&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
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