163 lines
18 KiB
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163 lines
18 KiB
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<title>std::chrono::operator==,<,<=,>,>=,<=>(std::chrono::leap_second)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>operator==,<,<=,>,>=,<=><span style="font-size:0.7em; line-height:130%">(std::chrono::leap_second)</span></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-leap_second.html">leap second</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="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> x,<br />
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</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="kw4">constexpr</span> std<span class="sy4">::</span><span class="me2">strong_ordering</span> operator<span class="sy1"><=></span><span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> x,<br />
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></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> Duration <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> x,<br /></p>
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<span class="kw4">const</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="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</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> Duration <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><</span> <span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> x,<br /></p>
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<span class="kw4">const</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="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</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> Duration <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><</span> <span class="br0">(</span> <span class="kw4">const</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="sy3">&</span> x,<br /></p>
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</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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<tr class="t-dcl t-since-cxx20">
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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><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">></span> <span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> x,<br /></p>
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<span class="kw4">const</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="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</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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<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><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">></span> <span class="br0">(</span> <span class="kw4">const</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="sy3">&</span> x,<br /></p>
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(7)</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><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><=</span><span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> x,<br /></p>
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<span class="kw4">const</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="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(8)</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><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1"><=</span><span class="br0">(</span> <span class="kw4">const</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="sy3">&</span> x,<br /></p>
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(9)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx20">
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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><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">>=</span><span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap</span><span class="sy3">&</span> x,<br /></p>
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<span class="kw4">const</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="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(10)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<tr class="t-dcl t-since-cxx20">
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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><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">>=</span><span class="br0">(</span> <span class="kw4">const</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="sy3">&</span> x,<br /></p>
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(11)</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> requires std<span class="sy4">::</span><span class="me2">three_way_comparable_with</span><span class="sy1"><</span><br />
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std<span class="sy4">:</span>chrono<span class="sy4">::</span><span class="me2">sys_seconds</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><br />
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> operator<span class="sy1"><=></span><span class="br0">(</span> <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">leap_second</span><span class="sy3">&</span> x,<br /></p>
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<span class="kw4">const</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="sy3">&</span> y <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(12)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<td></td>
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<p>比较对象 <code>x</code> 与 <code>y</code> 所表示的日期和时间。</p>
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<p><span class="t-v">(12)</span> 的返回类型从 <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><=></span> y</span></span> 推导，从而为 <span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::seconds</a></span> 与 <code>Duration</code> 的三路比较结果类型。</p>
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<p><code>!=</code> 运算符从 <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">合成</a>。</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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<div class="t-li1"><span class="t-li">1)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> y.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><=></span> y.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> y</span></span></div>
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<div class="t-li1"><span class="t-li">4)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><</span> y</span></span></div>
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<div class="t-li1"><span class="t-li">5)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1"><</span> y.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">6)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">></span> y</span></span></div>
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<div class="t-li1"><span class="t-li">7)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">></span> y.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">8)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><=</span> y</span></span></div>
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<div class="t-li1"><span class="t-li">9)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1"><=</span> y.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">10)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">>=</span> y</span></span></div>
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<div class="t-li1"><span class="t-li">11)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy1">>=</span> y.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span></span></span></div>
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<div class="t-li1"><span class="t-li">12)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">date</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><=></span> y</span></span></div>
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