104 lines
5.6 KiB
HTML
104 lines
5.6 KiB
HTML
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<title>std::chrono::time_point<Clock,Duration>::operator+, operator-</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_time_point_operator_arith 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::time_point<Clock,Duration>::</span>operator+, operator-</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-time_point.html">time point</a></span></div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp">time_point<span class="sy3">&</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> duration<span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> time_point<span class="sy3">&</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> duration<span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<td rowspan="142">(2)</td>
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<div><span class="mw-geshi cpp source-cpp">time_point<span class="sy3">&</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> duration<span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> time_point<span class="sy3">&</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> duration<span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p>以指定的时长修改时间点。</p>
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<div class="t-li1"><span class="t-li">1)</span> 应用偏移 <code>d</code> 到 <code>pt</code> 。等效地以 <span class="t-c"><span class="mw-geshi cpp source-cpp">d_ <span class="sy2">+</span><span class="sy1">=</span> d</span></span> 将 <code>d</code> 加到内部存储的 duration 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以负方向应用偏移 <code>d</code> 到 <code>pt</code> 。等效地以 <span class="t-c"><span class="mw-geshi cpp source-cpp">d_ <span class="sy2">-</span><span class="sy1">=</span> d</span></span> 从内部存储的 duration <code>d_</code> 减去 <code>d</code> 。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>d</td>
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<td>-</td>
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<td>要应用的时间偏移</td>
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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"><span class="sy2">*</span>this</span></span> 。</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>可能抛出实现定义的异常。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-chrono-time_point-operator_arith2.html"><span class="t-lines"><span>operator+</span><span>operator-</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>实施涉及时间点的加法和减法运算<br />
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<span class="t-mark">(函数模板)</span></td>
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