129 lines
6.7 KiB
HTML
129 lines
6.7 KiB
HTML
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<title>std::chrono::hh_mm_ss</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_hh_mm_ss 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::chrono::</span>hh_mm_ss</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-chrono.html">chrono</a></span></div>
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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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Duration <span class="sy1">></span><br />
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<span class="kw1">class</span> hh_mm_ss<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>类模板 <code>hh_mm_ss</code> 将 <span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::duration</a></span> 分割成如 <i>时</i>:<i>分</i>:<i>秒</i> 的“拆分”时刻，拆分的精度由 <code>Duration</code> 模板形参确定。它主要是格式化工具。</p>
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<p><code>Duration</code> 必须是 <span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::duration</a></span> 的特化，否则程序非良构。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.B8.B8.E9.87.8F">成员常量</span></h3>
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<div><span class="t-lines"><span><span class="t-dsc-small">constexpr unsigned</span> fractional_width</span></span></div>
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<div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div>
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<td>范围 [0, 18] 中的最小可能整数，使得 <code>precision</code> （见后述）将准确地表达 <span class="t-c"><span class="mw-geshi cpp source-cpp">Duration<span class="br0">{</span><span class="nu0">1</span><span class="br0">}</span></span></span> 的值，或若无这种整数则为 6<br />
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<span class="t-mark">(公开静态成员常量)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>成员类型</td>
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<td>定义</td>
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<td><code>precision</code></td>
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<td><code>std::chrono::duration<std::common_type_t<Duration::rep, std::chrono::seconds::rep>, std::ratio<1, <span class="texhtml" style="white-space: nowrap;">10<span class="t-su">fractional_width<br /></span></span>>></code></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div><a href="cpp-chrono-hh_mm_ss-hh_mm_ss.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</td>
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<td>构造 <code>hh_mm_ss</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-chrono-hh_mm_ss-accessors.html"><span class="t-lines"><span>is_negative</span><span>hours</span><span>minutes</span><span>seconds</span><span>subseconds</span></span></a></div>
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<td>获得拆分时刻的组分<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-chrono-hh_mm_ss-duration.html"><span class="t-lines"><span>operator precision</span><span>to_duration</span></span></a></div>
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</div>
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</td>
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<td>获得存储的 <span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::duration</a></span><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
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<div><a href="cpp-chrono-hh_mm_ss-operator_ltlt.html"><span class="t-lines"><span>operator<<</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>输出 <code>hh_mm_ss</code> 到流中<br />
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<span class="t-mark">(函数模板)</span></td>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</span></h3>
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<div><a href="cpp-chrono-hh_mm_ss-formatter.html"><span class="t-lines"><span>std::formatter<span class="t-dsc-small"><std::chrono::hh_mm_ss></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>hh_mm_ss</code><br />
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<span class="t-mark">(类模板特化)</span></td>
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