209 lines
16 KiB
HTML
209 lines
16 KiB
HTML
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<title>operator+, operator-(std::chrono::time_point)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_time_point_operator_arith2 skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">operator+, operator-<span class="t-dsc-small">(std::chrono::time_point)</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-time_point.html">time point</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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<td rowspan="142">(1)</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> C, <span class="kw1">class</span> D1, <span class="kw1">class</span> R2, <span class="kw1">class</span> P2 <span class="sy1">></span><br /></span>
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<p>time_point<span class="sy1"><</span>C, <span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>D1, duration<span class="sy1"><</span>R2,P2<span class="sy1">>></span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">></span><br />
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operator<span class="sy2">+</span><span class="br0">(</span> <span class="kw4">const</span> time_point<span class="sy1"><</span>C,D1<span class="sy1">></span><span class="sy3">&</span> pt,<br /></p>
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<span class="kw4">const</span> duration<span class="sy1"><</span>R2,P2<span class="sy1">></span><span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx14">(C++14 前)</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> C, <span class="kw1">class</span> D1, <span class="kw1">class</span> R2, <span class="kw1">class</span> P2 <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> time_point<span class="sy1"><</span>C, <span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>D1, duration<span class="sy1"><</span>R2,P2<span class="sy1">>></span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">></span><br />
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operator<span class="sy2">+</span><span class="br0">(</span> <span class="kw4">const</span> time_point<span class="sy1"><</span>C,D1<span class="sy1">></span><span class="sy3">&</span> pt,<br /></p>
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<span class="kw4">const</span> duration<span class="sy1"><</span>R2,P2<span class="sy1">></span><span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<td rowspan="142">(2)</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> R1, <span class="kw1">class</span> P1, <span class="kw1">class</span> C, <span class="kw1">class</span> D2 <span class="sy1">></span><br /></span>
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<p>time_point<span class="sy1"><</span>C, <span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>duration<span class="sy1"><</span>R1,P1<span class="sy1">></span>,D2<span class="sy1">></span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">></span><br />
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operator<span class="sy2">+</span><span class="br0">(</span> <span class="kw4">const</span> duration<span class="sy1"><</span>R1,P1<span class="sy1">></span><span class="sy3">&</span> d,<br /></p>
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<span class="kw4">const</span> time_point<span class="sy1"><</span>C,D2<span class="sy1">></span><span class="sy3">&</span> pt <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx14">(C++14 前)</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> R1, <span class="kw1">class</span> P1, <span class="kw1">class</span> C, <span class="kw1">class</span> D2 <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> time_point<span class="sy1"><</span>C, <span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>duration<span class="sy1"><</span>R1,P1<span class="sy1">></span>,D2<span class="sy1">></span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">></span><br />
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operator<span class="sy2">+</span><span class="br0">(</span> <span class="kw4">const</span> duration<span class="sy1"><</span>R1,P1<span class="sy1">></span><span class="sy3">&</span> d,<br /></p>
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<span class="kw4">const</span> time_point<span class="sy1"><</span>C,D2<span class="sy1">></span><span class="sy3">&</span> pt <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<tbody></tbody>
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<td rowspan="142">(3)</td>
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<td></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> C, <span class="kw1">class</span> D1, <span class="kw1">class</span> R2, <span class="kw1">class</span> P2 <span class="sy1">></span><br /></span>
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<p>time_point<span class="sy1"><</span>C, <span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>D1, duration<span class="sy1"><</span>R2,P2<span class="sy1">>></span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">></span><br />
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operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> time_point<span class="sy1"><</span>C,D1<span class="sy1">></span><span class="sy3">&</span> pt,<br /></p>
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<span class="kw4">const</span> duration<span class="sy1"><</span>R2,P2<span class="sy1">></span><span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx14">(C++14 前)</span></td>
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<tr class="t-dcl t-since-cxx14">
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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> C, <span class="kw1">class</span> D1, <span class="kw1">class</span> R2, <span class="kw1">class</span> P2 <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> time_point<span class="sy1"><</span>C, <span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>D1, duration<span class="sy1"><</span>R2,P2<span class="sy1">>></span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">></span><br />
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operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> time_point<span class="sy1"><</span>C,D1<span class="sy1">></span><span class="sy3">&</span> pt,<br /></p>
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<span class="kw4">const</span> duration<span class="sy1"><</span>R2,P2<span class="sy1">></span><span class="sy3">&</span> d <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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</tbody>
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<tbody></tbody>
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<td rowspan="142">(4)</td>
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<td></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> C, <span class="kw1">class</span> D1, <span class="kw1">class</span> D2 <span class="sy1">></span><br /></span>
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<p><span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>D1,D2<span class="sy1">></span><span class="sy4">::</span><span class="me2">type</span><br />
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operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> time_point<span class="sy1"><</span>C,D1<span class="sy1">></span><span class="sy3">&</span> pt_lhs,<br /></p>
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<span class="kw4">const</span> time_point<span class="sy1"><</span>C,D2<span class="sy1">></span><span class="sy3">&</span> pt_rhs <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx14">(C++14 前)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx14">
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<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> C, <span class="kw1">class</span> D1, <span class="kw1">class</span> D2 <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw1">typename</span> <a href="cpp-types-common_type.html"><span class="kw635">std::<span class="me2">common_type</span></span></a><span class="sy1"><</span>D1,D2<span class="sy1">></span><span class="sy4">::</span><span class="me2">type</span><br />
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operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> time_point<span class="sy1"><</span>C,D1<span class="sy1">></span><span class="sy3">&</span> pt_lhs,<br /></p>
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<span class="kw4">const</span> time_point<span class="sy1"><</span>C,D2<span class="sy1">></span><span class="sy3">&</span> pt_rhs <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>进行涉及 <code>time_point</code> 的加减运算。</p>
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<div class="t-li1"><span class="t-li">1-2)</span> 应用偏移 <code>d</code> 到 <code>pt</code> 。等效于返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">CT<span class="br0">(</span>pt.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> d<span class="br0">)</span></span></span> ，其中 <code>CT</code> 为返回类型。</div>
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<div class="t-li1"><span class="t-li">3)</span> 以负方向应用偏移 <code>d</code> 到 <code>pt</code> 。等效于返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">CT<span class="br0">(</span>pt.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> d<span class="br0">)</span></span></span> ，其中 <code>CT</code> 为返回类型。</div>
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<div class="t-li1"><span class="t-li">4)</span> 计算 <code>pt_lhs</code> 与 <code>pt_rhs</code> 之间的差。</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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<table class="t-par-begin">
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<td>pt</td>
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<td>-</td>
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<td>要应用偏移到的时间点</td>
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</tr>
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<tr class="t-par">
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<td>d</td>
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<td>-</td>
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<td>时间偏移</td>
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</tr>
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<tr class="t-par">
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<td>pt_lhs, pt_rhs</td>
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<td>-</td>
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<td>用于提取差的时间点</td>
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</tr>
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</table>
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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">1-3)</span> 由应用偏移 <code>d</code> 产生的时间点。</div>
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<div class="t-li1"><span class="t-li">4)</span> 时间点之间的时长。</div>
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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=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<tr>
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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</tr>
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<tr>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2739">LWG 2739</a></td>
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<td>C++11</td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">pt <span class="sy2">-</span> d</span></span> 对无符号 <code>duration</code> 行为不规律</td>
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<td>更正行为</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-chrono-time_point-operator_arith.html"><span class="t-lines"><span>operator+=</span><span>operator-=</span></span></a></div>
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</div>
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</td>
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<td>以给定的 duration 修改 time_point<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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