166 lines
10 KiB
HTML
166 lines
10 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::zoned_time</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_zoned_time 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>zoned_time</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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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><br /></span>
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<p> <span class="kw1">class</span> Duration,<br />
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<span class="kw1">class</span> TimeZonePtr <span class="sy1">=</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_zone</span><span class="sy2">*</span><br /></p>
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<span class="sy1">></span> <span class="kw1">class</span> zoned_time<span class="sy4">;</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">using</span> zoned_seconds <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">zoned_time</span><span class="sy1"><</span><a href="cpp-chrono-duration.html"><span class="kw997">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="sy1">></span><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 <code>zoned_time</code> 表示时区与解析为 <code>Duration</code> 的 <span class="t-lc"><a href="cpp-chrono-time_point.html">std::chrono::time_point</a></span> 的逻辑配对。</p>
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<p><code>zoned_time</code> 的不变量是它始终指代合法的时区并表示该时区中存在且无歧义的时间点。为与此不变量一致， <code>zoned_time</code> 无移动构造函数或移动赋值运算符；试图移动 <code>zoned_time</code> 将进行复制。</p>
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<p>若 <code>Duration</code> 不是 <span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::duration</a></span> 的特化则程序为谬构。</p>
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<p>模板形参 <code>TimeZonePtr</code> 允许用户提供其自身的时区指针类型并进一步经由 <span class="t-lc">std::chrono::zoned_traits</span> 定制 <code>zoned_time</code> 的行为。定制的时区类型不需要支持 <span class="t-lc">std::chrono::time_zone</span> 所支持的所有操作，只需支持实际在 <code>zoned_time</code> 上调用的函数所用的操作。</p>
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<p><code>TimeZonePtr</code> 必须为<a href="cpp-named_req-MoveConstructible.html"><span style="font-style:italic">可移动构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveConstructible)</span></a> 。允许仅移动的 <code>TimeZonePtr</code> ，但难以使用，因为 <code>zoned_time</code> 将为不可移动且不可能访问存储的 <code>TimeZonePtr</code> 。</p>
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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>duration</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-common_type.html"><span class="kw636">std::<span class="me2">common_type_t</span></span></a><span class="sy1"><</span>Duration, <a href="cpp-chrono-duration.html"><span class="kw997">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="sy1">></span></span></span></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 class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-chrono-zoned_time-zoned_time.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>zoned_time</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-zoned_time-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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<td>赋值给 <code>zoned_time</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-zoned_time-get_time_zone.html"><span class="t-lines"><span>get_time_zone</span></span></a></div>
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</td>
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<td>获得时区指针的副本<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-zoned_time-get_local_time.html"><span class="t-lines"><span>operator local_time</span><span>get_local_time</span></span></a></div>
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</td>
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<td>获得作为 <code>local_time</code> 的存储的时间点<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-zoned_time-get_sys_time.html"><span class="t-lines"><span>operator sys_time</span><span>get_sys_time</span></span></a></div>
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</td>
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<td>获得作为 <code>sys_time</code> 的存储的时间点<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-chrono-zoned_time-get_info.html"><span class="t-lines"><span>get_info</span></span></a></div>
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</div>
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</td>
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<td>获得关于在存储的时间点的时区的信息<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 class="t-dsc-member-div">
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<div><a href="cpp-chrono-zoned_time-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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</div>
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</td>
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<td>比较二个 <code>zoned_time</code> 值<br />
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<span class="t-mark">(函数模板)</span></td>
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<div><a href="cpp-chrono-zoned_time-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>zoned_time</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-zoned_time-formatter.html"><span class="t-lines"><span>std::formatter<span class="t-dsc-small"><std::chrono::zoned_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>zoned_time</code><br />
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<span class="t-mark">(类模板特化)</span></td>
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<h3><span class="mw-headline" id=".E6.8E.A8.E5.AF.BC.E6.8C.87.E5.BC.95"><a href="cpp-chrono-zoned_time-deduction_guides.html">推导指引</a></span></h3>
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</div>
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<div class="visualClear"></div>
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