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<title>std::chrono::duration&lt;Rep,Period&gt;::operator+(unary), std::chrono::duration&lt;Rep,Period&gt;::operator-(unary)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::duration&lt;Rep,Period&gt;::</span>operator+<span class="t-dsc-small">(unary)</span>, <span style="font-size:0.7em; line-height:130%">std::chrono::duration&lt;Rep,Period&gt;::</span>operator-<span class="t-dsc-small">(unary)</span></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-chrono.html">chrono</a>&lrm; | <a href="cpp-chrono-duration.html">duration</a></span></div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> duration operator<span class="sy2">+</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <a href="cpp-types-common_type.html"><span class="kw636">std::<span class="me2">common_type_t</span></span></a><span class="sy1">&lt;</span>duration<span class="sy1">&gt;</span> operator<span class="sy2">+</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</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="kw4">constexpr</span> duration operator<span class="sy2">-</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <a href="cpp-types-common_type.html"><span class="kw636">std::<span class="me2">common_type_t</span></span></a><span class="sy1">&lt;</span>duration<span class="sy1">&gt;</span> operator<span class="sy2">-</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<p>&#23454;&#29616; duration &#30340;&#19968;&#20803;&#21152;&#21644;&#19968;&#20803;&#20943;&#12290;</p>
<p>&#33509; <code>rep_</code> &#20026; duration &#23545;&#35937;&#20013;&#20445;&#26377;&#35745;&#27425;&#25968;&#30340;&#25104;&#21592;&#21464;&#37327;&#65292;&#32780; <code>D</code> &#26159;&#36820;&#22238;&#31867;&#22411;&#65292;&#21017;</p>
<div class="t-li1"><span class="t-li">1)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> D<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">;</span></span></span></div>
<div class="t-li1"><span class="t-li">2)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> D<span class="br0">(</span><span class="sy2">-</span>rep_<span class="br0">)</span><span class="sy4">;</span></span></span></div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#27492; duration &#23545;&#35937;&#30340;&#21103;&#26412;</div>
<div class="t-li1"><span class="t-li">2)</span> &#27492; duration &#23545;&#35937;&#30340;&#21103;&#26412;&#65292;&#23545;&#20854;&#35745;&#27425;&#25968;&#21462;&#21453;</div>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;chrono&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</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> s1<span class="br0">(</span><span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</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> s2 <span class="sy1">=</span> <span class="sy2">-</span>s1<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;negated 10 seconds are &quot;</span> <span class="sy1">&lt;&lt;</span> s2.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; seconds<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">negated 10 seconds are -10 seconds</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-chrono-duration-operator_arith2.html"><span class="t-lines"><span>operator++</span><span>operator++<span class="t-dsc-small">(int)</span></span><span>operator--</span><span>operator--<span class="t-dsc-small">(int)</span></span></span></a></div>
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<td>&#36882;&#22686;&#25110;&#36882;&#20943;&#28404;&#31572;&#35745;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-chrono-duration-operator_arith4.html"><span class="t-lines"><span>operator+</span><span>operator-</span><span>operator*</span><span>operator/</span><span>operator%</span></span></a></div>
<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>&#23454;&#29616;&#20197;&#26102;&#38271;&#20026;&#23454;&#21442;&#30340;&#31639;&#26415;&#36816;&#31639;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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