87 lines
9.9 KiB
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87 lines
9.9 KiB
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<title>std::chrono::zoned_time 的推导指引</title>
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<h1 id="firstHeading" class="firstHeading"><code>std::chrono::zoned_time</code> 的推导指引</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-chrono.html">chrono</a>‎ | <a href="cpp-chrono-zoned_time.html">zoned time</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">zoned_time<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> zoned_time<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>(1)</td>
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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> <span class="kw1">class</span> Duration <span class="sy1">></span><br /></span>
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<p>zoned_time<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">sys_time</span><span class="sy1"><</span>Duration<span class="sy1">></span><span class="br0">)</span><br /></p>
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<span class="sy2">-</span><span class="sy1">></span> zoned_time<span class="sy1"><</span><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 class="sy4">;</span></div>
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<td>(2)</td>
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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> <span class="kw1">class</span> TimeZonePtrOrName <span class="sy1">></span><br />
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zoned_time<span class="br0">(</span>TimeZonePtrOrName<span class="sy3">&&</span><span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> zoned_time<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="coMULTI">/* see below */</span><span class="sy1">></span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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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> <span class="kw1">class</span> TimeZonePtrOrName, <span class="kw1">class</span> Duration <span class="sy1">></span><br /></span>
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<p>zoned_time<span class="br0">(</span>TimeZonePtrOrName<span class="sy3">&&</span>, std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">sys_time</span><span class="sy1"><</span>Duration<span class="sy1">></span><span class="br0">)</span><br /></p>
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<span class="sy2">-</span><span class="sy1">></span> zoned_time<span class="sy1"><</span><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 class="coMULTI">/* see below */</span><span class="sy1">></span><span class="sy4">;</span></div>
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<td>(4)</td>
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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> <span class="kw1">class</span> TimeZonePtrOrName, <span class="kw1">class</span> Duration <span class="sy1">></span><br /></span>
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<p>zoned_time<span class="br0">(</span>TimeZonePtrOrName<span class="sy3">&&</span>, std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">local_time</span><span class="sy1"><</span>Duration<span class="sy1">></span>,<br />
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std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">choose</span> <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">choose</span><span class="sy4">::</span><span class="me2">earliest</span><span class="br0">)</span><br /></p>
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<span class="sy2">-</span><span class="sy1">></span> zoned_time<span class="sy1"><</span><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 class="coMULTI">/* see below */</span><span class="sy1">></span><span class="sy4">;</span></div>
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<td>(5)</td>
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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> <span class="kw1">class</span> TimeZonePtrOrName<span class="sy3">&&</span>, <span class="kw1">class</span> Duration, <span class="kw1">class</span> TimeZonePtr2 <span class="sy1">></span><br /></span>
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<p>zoned_time<span class="br0">(</span>TimeZonePtrOrName, std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">zoned_time</span><span class="sy1"><</span>Duration, TimeZonePtr2<span class="sy1">></span>,<br />
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std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">choose</span> <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">choose</span><span class="sy4">::</span><span class="me2">earliest</span><span class="br0">)</span><br /></p>
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<span class="sy2">-</span><span class="sy1">></span> zoned_time<span class="sy1"><</span><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 class="coMULTI">/* see below */</span><span class="sy1">></span><span class="sy4">;</span></div>
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<td>(6)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>为 <code>zoned_time</code> 提供六个推导指引。它们把 <code>Duration</code> 正规化为最小解析为 <span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::seconds</a></span> ，并提供用可转换成 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a></span></span> 的类型指定时区名的正确处理。</p>
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<div class="t-li1"><span class="t-li">3-6)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-is_convertible.html"><span class="kw593">std::<span class="me2">is_convertible_v</span></span></a><span class="sy1"><</span>TimeZonePtrOrName, <a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a><span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，则推导的第二模板实参为 <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> 。否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">remove_cvref_t</span><span class="sy1"><</span>TimeZonePtrOrName<span class="sy1">></span></span></span> 。</div>
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