51 lines
3.0 KiB
HTML
51 lines
3.0 KiB
HTML
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<title>std::chrono::choose</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_choose 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>choose</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="kw2">enum</span> <span class="kw1">class</span> choose <span class="br0">{</span><br /></span>
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<p> earliest,<br />
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latest<br /></p>
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<span class="br0">}</span><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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<p>能将有作用域枚举 <code>choose</code> 传递给 <span class="t-lc">std::chrono::time_zone</span> 和 <span class="t-lc">std::chrono::zoned_time</span> 的一些成员函数，以确定如何解析歧义或不存在的本地时间。传递 <code>choose::earliest</code> 导致返回较早的时间点，而传递 <code>choose::latest</code> 导致返回较迟的时间点。（对于不存在的本地时间，二个时间点是等同的。）</p>
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<p>若不传递 <code>choose</code> 且遇到有歧义或不存在的本地时间，则将抛出 <span class="t-lc">std::chrono::ambiguous_local_time</span> 或 <span class="t-lc">std::chrono::nonexistent_local_time</span> 异常（其中的适用者）。</p>
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