211 lines
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211 lines
12 KiB
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_weekday 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>weekday</h1>
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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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> weekday<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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday</span> Sunday<span class="br0">{</span><span class="nu0">0</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday</span> Monday<span class="br0">{</span><span class="nu0">1</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday</span> Tuesday<span class="br0">{</span><span class="nu0">2</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday</span> Wednesday<span class="br0">{</span><span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday</span> Thursday<span class="br0">{</span><span class="nu0">4</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday</span> Friday<span class="br0">{</span><span class="nu0">5</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday</span> Saturday<span class="br0">{</span><span class="nu0">6</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<p>类 <code>weekday</code> 表示格里高利历中的星期之日。其正常范围为 [0, 6] ，从星期日到星期六，但它能保有范围 [0, 255] 中的任何值。对星期的七日，于 <code>std::chrono</code> 命名空间中预定义七个具名常量。</p>
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<p><code>weekday</code> 是<a href="cpp-named_req-TriviallyCopyable.html"><span style="font-style:italic">可平凡复制</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(TriviallyCopyable)</span></a> 的<a href="cpp-named_req-StandardLayoutType.html"><span style="font-style:italic">标准布局类型</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(StandardLayoutType)</span></a> 。</p>
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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-weekday-weekday.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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<td>构造 <code>weekday</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-weekday-operator_inc_dec.html"><span class="t-lines"><span>operator++</span><span>operator++<span class="t-dsc-small">(int)</span></span><span>operator--</span><span>operator--<span class="t-dsc-small">(int)</span></span></span></a></div>
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<td>自增或自减 <code>weekday</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-weekday-operator_arith.html"><span class="t-lines"><span>operator+=</span><span>operator-=</span></span></a></div>
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<td>加或减日数<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-weekday-encoding.html"><span class="t-lines"><span>c_encoding</span><span>iso_encoding</span></span></a></div>
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<td>取得存储的星期值日值<br />
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取得 ISO 8601 星期之日值<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-weekday-ok.html"><span class="t-lines"><span>ok</span></span></a></div>
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</td>
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<td>检查存储的星期之日值是否合法<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-weekday-operator_at.html"><span class="t-lines"><span>operator[]</span></span></a></div>
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<td>从此 <code>weekday</code> 构造 <a href="cpp-chrono-weekday_indexed.html"><tt>weekday_indexed</tt></a> 或 <a href="cpp-chrono-weekday_last.html"><tt>weekday_last</tt></a> 的便利语法<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-weekday-operator_cmp.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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<td>比较二个 <code>weekday</code> 值<br />
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<span class="t-mark">(函数)</span></td>
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<div><a href="cpp-chrono-weekday-operator_arith_2.html"><span class="t-lines"><span>operator+</span><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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<td>在 <code>weekday</code> 上进行算术<br />
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<span class="t-mark">(函数)</span></td>
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<div><a href="cpp-chrono-weekday-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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<td>输出 <code>weekday</code> 到流中<br />
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<span class="t-mark">(函数模板)</span></td>
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<div><a href="cpp-chrono-weekday-from_stream.html"><span class="t-lines"><span>from_stream</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>按照提供的格式从流分析 <code>weekday</code><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-weekday-formatter.html"><span class="t-lines"><span>std::formatter<span class="t-dsc-small"><std::chrono::weekday></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>weekday</code><br />
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<span class="t-mark">(类模板特化)</span></td>
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