94 lines
6.3 KiB
HTML
94 lines
6.3 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::chrono::operator<<(std::chrono::utc_time)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_utc_clock_operator_ltlt skin-cppreference2 action-view cpp-page-template cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>operator<<<small>(std::chrono::utc_time)</small></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-chrono.html">chrono</a>‎ | <a href="cpp-chrono-utc_clock.html">utc clock</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div class="t-page-template" style="">
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<p></p>
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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-chrono.html"><chrono></a></code></div>
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<td></td>
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<tr class="t-dcl t-since-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits, <span class="kw1">class</span> Duration<span class="sy1">></span><br /></span>
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<p><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy3">&</span><br />
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operator<span class="sy1"><<</span><span class="br0">(</span><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy3">&</span> os,<br /></p>
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">utc_time</span><span class="sy1"><</span>Duration<span class="sy1">></span><span class="sy3">&</span> tp<span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>输出 <code>tp</code> 到流 <code>os</code> 中，如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">os <span class="sy1"><<</span> std<span class="sy4">::</span><span class="me2">format</span><span class="br0">(</span>STATICALLY_WIDEN<span class="sy1"><</span>CharT<span class="sy1">></span><span class="br0">(</span><span class="st0">"{:L%F %T}"</span><span class="br0">)</span>, tp<span class="br0">)</span></span></span> ，其中 <span class="t-c"><span class="mw-geshi cpp source-cpp">STATICALLY_WIDEN<span class="sy1"><</span>CharT<span class="sy1">></span><span class="br0">(</span><span class="st0">"{:L%F %T}"</span><span class="br0">)</span></span></span> 若 <code>CharT</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"{:L%F %T}"</span></span></span> ，而若 <code>CharT</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">wchar_t</span></span></span> 则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">"{:L%F %T}"</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><code>os</code> 。</p>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://wg21.link/P2372R3">P2372R3</a></td>
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<td>C++20</td>
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<td>默认使用给定的本地环境</td>
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<td>需要 <code><b>L</b></code> 以使用本地环境</td>
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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><a href="cpp-chrono-utc_clock-formatter.html"><span class="t-lines"><span>std::formatter<span class="t-dsc-small"><std::chrono::utc_time></span></span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td><span class="t-lc">std::formatter</span> 的特化，按照提供的格式格式化 <code>utc_time</code><br />
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<span class="t-mark">(类模板特化)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-utility-format-format.html"><span class="t-lines"><span>format</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>在新 string 中存储参数的格式化表示<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<div class="visualClear"></div>
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