klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
f20b7aa61c525af873d583dfd87c8143591b65e5
hustoj/web/cppreference-zh/chmhelp/cpp-chrono-duration-operator_arith3.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

235 lines
15 KiB
HTML
Raw Blame History

<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>std::chrono::duration&lt;Rep,Period&gt;::operator+=, -=, *=, /=, %=</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_duration_operator_arith3 skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::duration&lt;Rep,Period&gt;::</span>operator+=, -=, *=, /=, %=</h1>
<div id="bodyContent">
<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>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">duration<span class="sy3">&amp;</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy3">&amp;</span> d<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> duration<span class="sy3">&amp;</span> operator<span class="sy2">+</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy3">&amp;</span> d<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
</tbody>
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(2)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">duration<span class="sy3">&amp;</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy3">&amp;</span> d<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> duration<span class="sy3">&amp;</span> operator<span class="sy2">-</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy3">&amp;</span> d<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
</tbody>
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(3)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">duration<span class="sy3">&amp;</span> operator<span class="sy2">*</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> rep<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> duration<span class="sy3">&amp;</span> operator<span class="sy2">*</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> rep<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
</tbody>
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(4)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">duration<span class="sy3">&amp;</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> rep<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> duration<span class="sy3">&amp;</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> rep<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
</tbody>
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(5)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">duration<span class="sy3">&amp;</span> operator<span class="sy2">%</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> rep<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> duration<span class="sy3">&amp;</span> operator<span class="sy2">%</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> rep<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
</tbody>
<tbody></tbody>
<tbody class="t-dcl-rev t-dcl-rev-num">
<tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(6)</td>
<td></td>
</tr>
<tr class="t-dcl t-until-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp">duration<span class="sy3">&amp;</span> operator<span class="sy2">%</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> duration<span class="sy3">&amp;</span> operator<span class="sy2">%</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
</tr>
</tbody>
<tbody>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#22312;&#20108;&#20010;&#25317;&#26377;&#21516;&#19968;&#21608;&#26399;&#30340;&#26102;&#38271;&#25110;&#26102;&#38271;&#21644;&#35745;&#27425;&#20540;&#20043;&#38388;&#36827;&#34892;&#22797;&#21512;&#36171;&#20540;&#12290;</p>
<p>&#33509; <code>rep_</code> &#26159;&#27492; duration &#23545;&#35937;&#20013;&#20445;&#26377;&#35745;&#27425;&#25968;&#30340;&#25104;&#21592;&#21464;&#37327;&#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">rep_ <span class="sy2">+</span><span class="sy1">=</span> d.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<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">rep_ <span class="sy2">-</span><span class="sy1">=</span> d.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span></span></span></div>
<div class="t-li1"><span class="t-li">3)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">rep_ <span class="sy2">*</span><span class="sy1">=</span> rhs<span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span></span></span></div>
<div class="t-li1"><span class="t-li">4)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">rep_ <span class="sy2">/</span><span class="sy1">=</span> rhs<span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span></span></span></div>
<div class="t-li1"><span class="t-li">5)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">rep_ <span class="sy2">%</span><span class="sy1">=</span> rhs<span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span></span></span></div>
<div class="t-li1"><span class="t-li">6)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">rep_ <span class="sy2">%</span><span class="sy1">=</span> d.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span></span></span></div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>d</td>
<td>-</td>
<td>&#36816;&#31639;&#31526;&#21491;&#20391;&#30340; duration</td>
</tr>
<tr class="t-par">
<td>rhs</td>
<td>-</td>
<td>&#36816;&#31639;&#31526;&#21491;&#20391;&#30340;&#35745;&#27425;&#25968;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#21040;&#20462;&#25913;&#21518;&#30340;&#27492; duration &#30340;&#24341;&#29992;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<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="kw998">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">minutes</span></span></a> m<span class="br0">(</span><span class="nu0">11</span><span class="br0">)</span><span class="sy4">;</span>
m <span class="sy2">*</span><span class="sy1">=</span> <span class="nu0">2</span><span class="sy4">;</span>
m <span class="sy2">+</span><span class="sy1">=</span> <a href="cpp-chrono-duration.html"><span class="kw999">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">hours</span></span></a><span class="br0">(</span><span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#23567;&#26102;&#21487;&#38544;&#24335;&#36716;&#25442;&#25104;&#20998;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> m.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; minutes equals &quot;</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-chrono-duration-duration_cast.html"><span class="kw1000">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration_cast</span></span></a><span class="sy1">&lt;</span><a href="cpp-chrono-duration.html"><span class="kw999">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">hours</span></span></a><span class="sy1">&gt;</span><span class="br0">(</span>m<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot; hours and &quot;</span><span class="sy4">;</span>
m <span class="sy2">%</span><span class="sy1">=</span> <a href="cpp-chrono-duration.html"><span class="kw999">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">hours</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><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> m.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; minutes<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">622 minutes equals 10 hours and 22 minutes</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<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>
</div>
</td>
<td>&#36882;&#22686;&#25110;&#36882;&#20943;&#28404;&#31572;&#35745;&#25968;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<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>
</div>
</td>
<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>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink