154 lines
12 KiB
HTML
154 lines
12 KiB
HTML
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<title>std::time_get<CharT,InputIt>::date_order, std::time_get<CharT,InputIt>::do_date_order</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_locale_time_get_date_order skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::time_get<CharT,InputIt>::</span>date_order, <span style="font-size:0.7em; line-height:130%">std::time_get<CharT,InputIt>::</span>do_date_order</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-time_get.html">time get</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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<td></td>
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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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dateorder date_order<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">protected</span><span class="sy4">:</span><br />
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<span class="kw1">virtual</span> dateorder do_date_order<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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<td></td>
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<div class="t-li1"><span class="t-li">1)</span> 公开成员函数，调用最终导出类的所保有虚成员函数 <code>do_date_order</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 返回 <span class="t-lc"><a href="cpp-locale-time_base.html">std::time_base::dateorder</a></span> 类型值，它描述此 locale 所用的默认日期格式（为 <span class="t-lc"><a href="cpp-locale-time_get-get_date.html">get_date()</a></span> 所期待并为 <span class="t-lc"><a href="cpp-chrono-c-strftime.html">std::strftime()</a></span> 用格式指定符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'%x'</span></span></span> 所产生）。</div>
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<p>合法值（继承自 <span class="t-lc"><a href="cpp-locale-time_base.html">std::time_base</a></span> ）：</p>
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<td><code>no_order</code></td>
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<td>含有可变项目（星期之日、尤里乌斯日等），或未实现此函数</td>
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</tr>
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<tr class="t-dsc">
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<td><code>dmy</code></td>
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<td>日、月、年（欧洲本地环境）</td>
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</tr>
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<tr class="t-dsc">
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<td><code>mdy</code></td>
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<td>月、日、年（美洲本地环境）</td>
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<td><code>ymd</code></td>
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<td>年、月、日（亚洲本地环境）</td>
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<td><code>ydm</code></td>
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<td>年、日、月（罕见）</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<p>（无）</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><code>dateorder</code> 类型值。</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>此函数为可选，它可在每种情况下都返回 <code>no_order</code> 。</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="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="kw4">void</span> show_date_order<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-locale-time_base.html"><span class="kw1924">std::<span class="me2">time_base</span><span class="sy4">::</span><span class="me2">dateorder</span></span></a> d <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-time_get.html"><span class="kw1949">std::<span class="me2">time_get</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-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="br0">)</span>
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<span class="br0">)</span>.<span class="me1">date_order</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">switch</span> <span class="br0">(</span>d<span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw1">case</span> <a href="cpp-locale-time_base.html"><span class="kw1925">std::<span class="me2">time_base</span><span class="sy4">::</span><span class="me2">no_order</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"><<</span> <span class="st0">"no_order<span class="es1">\n</span>"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
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<span class="kw1">case</span> <a href="cpp-locale-time_base.html"><span class="kw1926">std::<span class="me2">time_base</span><span class="sy4">::</span><span class="me2">dmy</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"><<</span> <span class="st0">"day, month, year<span class="es1">\n</span>"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
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<span class="kw1">case</span> <a href="cpp-locale-time_base.html"><span class="kw1927">std::<span class="me2">time_base</span><span class="sy4">::</span><span class="me2">mdy</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"><<</span> <span class="st0">"month, day, year<span class="es1">\n</span>"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
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<span class="kw1">case</span> <a href="cpp-locale-time_base.html"><span class="kw1928">std::<span class="me2">time_base</span><span class="sy4">::</span><span class="me2">ymd</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"><<</span> <span class="st0">"year, month, day<span class="es1">\n</span>"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
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<span class="kw1">case</span> <a href="cpp-locale-time_base.html"><span class="kw1929">std::<span class="me2">time_base</span><span class="sy4">::</span><span class="me2">ydm</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"><<</span> <span class="st0">"year, day, month<span class="es1">\n</span>"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</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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std<span class="sy4">::</span><span class="me2">locale</span><span class="sy4">::</span><span class="me2">global</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">"In U.S. locale, the default date order is: "</span><span class="sy4">;</span>
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show_date_order<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">locale</span><span class="sy4">::</span><span class="me2">global</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">"ja_JP.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">"In Japanese locale, the default date order is: "</span><span class="sy4">;</span>
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show_date_order<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">locale</span><span class="sy4">::</span><span class="me2">global</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">"de_DE.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">"In German locale, the default date order is: "</span><span class="sy4">;</span>
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show_date_order<span class="br0">(</span><span class="br0">)</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">In U.S. locale, the default date order is: month, day, year
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In Japanese locale, the default date order is: year, month, day
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In German locale, the default date order is: day, month, year</pre></div>
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</div>
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</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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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-time_get-get_date.html"><span class="t-lines"><span>do_get_date</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>从输入流输出月、日以及年<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-locale-time_base.html"><span class="t-lines"><span>time_base</span></span></a></div>
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</div>
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</td>
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<td>定义日期格式常量<br />
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<span class="t-mark">(类)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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