102 lines
6.6 KiB
HTML
102 lines
6.6 KiB
HTML
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<title>std::chrono::zoned_traits</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>zoned_traits</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">template</span> <span class="sy1"><</span> <span class="kw1">class</span> TimeZonePtr <span class="sy1">></span><br />
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<span class="kw1">struct</span> zoned_traits <span class="br0">{</span> <span class="br0">}</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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><></span><br />
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<span class="kw1">struct</span> zoned_traits<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><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_traits</code> 提供方式定制带定制时区指针类型的 <span class="t-lc">std::chrono::zoned_time</span> 构造函数的行为。具体而言，它允许这种类型指定要用的默认时区，和时区名到对应时区指针的映射。它可接受不支持任一操作的定制时区指针类型，该情况下对应的 <code>zoned_time</code> 构造函数将不参与重载决议。</p>
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<p>初等模板为空。为默认时区指针类型 <span class="t-c"><span class="mw-geshi cpp source-cpp"><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></span></span> 提供特化。</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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<h2><span class="mw-headline" id="std::chrono::zoned_traits.3Cconst_std::chrono::time_zone.2A.3E::default_zone"><span style="font-size:0.7em; line-height:130%">std::chrono::zoned_traits<const std::chrono::time_zone*>::</span>default_zone</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</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> default_zone<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>返回默认时区 (UTC) 的时区指针。</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><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">locate_zone</span><span class="br0">(</span><span class="st0">"UTC"</span><span class="br0">)</span></span></span> 。</p>
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<h2><span class="mw-headline" id="std::chrono::zoned_traits.3Cconst_std::chrono::time_zone.2A.3E::locate_zone"><span style="font-size:0.7em; line-height:130%">std::chrono::zoned_traits<const std::chrono::time_zone*>::</span>locate_zone</span></h2>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</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> locate_zone<span class="br0">(</span><a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a> name<span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>返回 <code>name</code> 所代表的时区的时区指针。</p>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC_2">返回值</span></h3>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">locate_zone</span><span class="br0">(</span>name<span class="br0">)</span></span></span> 。</p>
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