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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/rel_ops/operator_cmp.html" title="cpp/utility/rel ops/operator cmp"><span class="t-lines"><span>rel_ops::operator!=</span><span>rel_ops::operator></span><span>rel_ops::operator<=</span><span>rel_ops::operator>=</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Pairs and tuples</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/pair.html" title="cpp/utility/pair"><span class="t-lines"><span>pair</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/tuple.html" title="cpp/utility/tuple"><span class="t-lines"><span>tuple</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/piecewise_construct_t.html" title="cpp/utility/piecewise construct t"><span class="t-lines"><span>piecewise_construct_t</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/piecewise_construct.html" title="cpp/utility/piecewise construct"><span class="t-lines"><span>piecewise_construct</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/integer_sequence.html" title="cpp/utility/integer sequence"><span class="t-lines"><span>integer_sequence</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Swap, forward and move</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../algorithm/swap.html" title="cpp/algorithm/swap"><span class="t-lines"><span>swap</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/exchange.html" title="cpp/utility/exchange"><span class="t-lines"><span>exchange</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/forward.html" title="cpp/utility/forward"><span class="t-lines"><span>forward</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/move.html" title="cpp/utility/move"><span class="t-lines"><span>move</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/move_if_noexcept.html" title="cpp/utility/move if noexcept"><span class="t-lines"><span>move_if_noexcept</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></tr>
<tr class="t-nv-h2"><td colspan="5"> Type operations</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/declval.html" title="cpp/utility/declval"><span class="t-lines"><span>declval</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../utility/as_const.html" title="cpp/utility/as const"><span class="t-lines"><span>as_const</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/utility/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../chrono.html" title="cpp/chrono">Date and time utilities</a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="time_point.html" title="cpp/chrono/time point"><span class="t-lines"><span>time_point</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>duration</span></span></strong></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="system_clock.html" title="cpp/chrono/system clock"><span class="t-lines"><span>system_clock</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="steady_clock.html" title="cpp/chrono/steady clock"><span class="t-lines"><span>steady_clock</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="high_resolution_clock.html" title="cpp/chrono/high resolution clock"><span class="t-lines"><span>high_resolution_clock</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></tr>
<tr class="t-nv"><td colspan="5"> <a href="c.html" title="cpp/chrono/c"> C-style date and time</a></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink"><tt>std::chrono::duration</tt></strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/duration.html" title="cpp/chrono/duration/duration"><span class="t-lines"><span>duration::duration</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/operator=.html" title="cpp/chrono/duration/operator="><span class="t-lines"><span>duration::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/count.html" title="cpp/chrono/duration/count"><span class="t-lines"><span>duration::count</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/zero.html" title="cpp/chrono/duration/zero"><span class="t-lines"><span>duration::zero</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/min.html" title="cpp/chrono/duration/min"><span class="t-lines"><span>duration::min</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/max.html" title="cpp/chrono/duration/max"><span class="t-lines"><span>duration::max</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/operator_arith.html" title="cpp/chrono/duration/operator arith"><span class="t-lines"><span>duration::operator+</span><span>duration::operator-</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/operator_arith2.html" title="cpp/chrono/duration/operator arith2"><span class="t-lines"><span>duration::operator++</span><span>duration::operator--</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/operator_arith3.html" title="cpp/chrono/duration/operator arith3"><span class="t-lines"><span>duration::operator+=</span><span>duration::operator-=</span><span>duration::operator*=</span><span>duration::operator/=</span><span>duration::operator%=</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Non-member functions</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/operator_arith4.html" title="cpp/chrono/duration/operator arith4"><span class="t-lines"><span>operator+</span><span>operator-</span><span>operator*</span><span>operator/</span><span>operator%</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/operator_cmp.html" title="cpp/chrono/duration/operator cmp"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator<=</span><span>operator></span><span>operator>=</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/common_type.html" title="cpp/chrono/duration/common type"><span class="t-lines"><span>common_type</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/duration_cast.html" title="cpp/chrono/duration/duration cast"><span class="t-lines"><span>duration_cast</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/floor.html" title="cpp/chrono/duration/floor"><span class="t-lines"><span>floor</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/ceil.html" title="cpp/chrono/duration/ceil"><span class="t-lines"><span>ceil</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/round.html" title="cpp/chrono/duration/round"><span class="t-lines"><span>round</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration/abs.html" title="cpp/chrono/duration/abs"><span class="t-lines"><span>abs</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator""h.html" title="cpp/chrono/operator""h"><span class="t-lines"><span>operator""h</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator""min.html" title="cpp/chrono/operator""min"><span class="t-lines"><span>operator""min</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator""s.html" title="cpp/chrono/operator""s"><span class="t-lines"><span>operator""s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator""ms.html" title="cpp/chrono/operator""ms"><span class="t-lines"><span>operator""ms</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator""us.html" title="cpp/chrono/operator""us"><span class="t-lines"><span>operator""us</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator""ns.html" title="cpp/chrono/operator""ns"><span class="t-lines"><span>operator""ns</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Helper classes</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="treat_as_floating_point.html" title="cpp/chrono/treat as floating point"><span class="t-lines"><span>treat_as_floating_point</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="duration_values.html" title="cpp/chrono/duration values"><span class="t-lines"><span>duration_values</span></span></a></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>Defined in header <code><a href="../header/chrono.html" title="cpp/header/chrono"><chrono></a></code>
</div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><br />
<p>    <span class="kw1">class</span> Rep, <br />
    <span class="kw1">class</span> Period <span class="sy1">=</span> <a href="../numeric/ratio/ratio.html"><span class="kw1263">std::<span class="me2">ratio</span></span></a><span class="sy1"><</span><span class="nu0">1</span><span class="sy1">></span> <br />
</p>
<span class="sy1">></span> <span class="kw1">class</span> duration<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Class template <code>std::chrono::duration</code> represents a time interval.
</p><p>It consists of a count of ticks of type <code>Rep</code> and a tick period, where the tick period is a compile-time rational constant representing the number of seconds from one tick to the next.
</p><p>The only data stored in a <code>duration</code> is a tick count of type <code>Rep</code>. If <code>Rep</code> is floating point, then the <code>duration</code> can represent fractions of ticks. <code>Period</code> is included as part of the duration's type, and is only used when converting between different durations.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="duration.html#Member_types"><span class="tocnumber">1</span> <span class="toctext">Member types</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="duration.html#Member_functions"><span class="tocnumber">2</span> <span class="toctext">Member functions</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="duration.html#Non-member_functions"><span class="tocnumber">3</span> <span class="toctext">Non-member functions</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="duration.html#Helper_types"><span class="tocnumber">4</span> <span class="toctext">Helper types</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="duration.html#Helper_classes"><span class="tocnumber">5</span> <span class="toctext">Helper classes</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="duration.html#Literals"><span class="tocnumber">6</span> <span class="toctext">Literals</span></a></li>
<li class="toclevel-1 tocsection-7"><a href="duration.html#Example"><span class="tocnumber">7</span> <span class="toctext">Example</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration&action=edit&section=1" title="Edit section: Member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td> Member type
</td>
<td> Definition
</td></tr>
<tr class="t-dsc">
<td> <code>rep</code>
</td>
<td> <code>Rep</code>, an arithmetic type representing the number of ticks
</td></tr>
<tr class="t-dsc">
<td> <code>period</code>
</td>
<td> <code>Period</code>, a <span class="t-lc">std::ratio</span> representing the tick period (i.e. the number of seconds per tick)
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration&action=edit&section=2" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="duration/duration.html" title="cpp/chrono/duration/duration"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td> constructs new duration <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_constructor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/operator=.html" title="cpp/chrono/duration/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
</td>
<td> assigns the contents <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_operator%3D&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/count.html" title="cpp/chrono/duration/count"> <span class="t-lines"><span>count</span></span></a></div></div>
</td>
<td> returns the count of ticks <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_count&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/zero.html" title="cpp/chrono/duration/zero"> <span class="t-lines"><span>zero</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div></div>
</td>
<td> returns the special duration value zero <br /> <span class="t-mark">(public static member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_zero&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/min.html" title="cpp/chrono/duration/min"> <span class="t-lines"><span>min</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div></div>
</td>
<td> returns the special duration value min <br /> <span class="t-mark">(public static member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_min&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/max.html" title="cpp/chrono/duration/max"> <span class="t-lines"><span>max</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[static]</span></span></span></div></div>
</td>
<td> returns the special duration value max <br /> <span class="t-mark">(public static member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_max&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/operator_arith.html" title="cpp/chrono/duration/operator arith"> <span class="t-lines"><span>operator+</span><span>operator-</span></span></a></div></div>
</td>
<td> implements unary + and unary - <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_operator_arith&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/operator_arith2.html" title="cpp/chrono/duration/operator arith2"> <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> increments or decrements the tick count <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_operator_arith2&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/operator_arith3.html" title="cpp/chrono/duration/operator arith3"> <span class="t-lines"><span>operator+=</span><span>operator-=</span><span>operator*=</span><span>operator/=</span><span>operator%=</span></span></a></div></div>
</td>
<td> implements compound assignment between two durations <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_operator_arith3&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration&action=edit&section=3" title="Edit section: Non-member functions">edit</a>]</span> <span class="mw-headline" id="Non-member_functions">Non-member functions</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/common_type.html" title="cpp/chrono/duration/common type"> <span class="t-lines"><span>std::common_type<span class="t-dsc-small"><std::chrono::duration></span></span></span></a></div></div>
</td>
<td> specializes the <span class="t-lc">std::common_type</span> trait <br /> <span class="t-mark">(class template specialization)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_common_type&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/operator_arith4.html" title="cpp/chrono/duration/operator arith4"> <span class="t-lines"><span>operator+</span><span>operator-</span><span>operator*</span><span>operator/</span><span>operator%</span></span></a></div></div>
</td>
<td> implements arithmetic operations with durations as arguments <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_operator_arith4&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/operator_cmp.html" title="cpp/chrono/duration/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator<=</span><span>operator></span><span>operator>=</span></span></a></div></div>
</td>
<td> compares two durations <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_operator_cmp&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/duration_cast.html" title="cpp/chrono/duration/duration cast"> <span class="t-lines"><span>duration_cast</span></span></a></div></div>
</td>
<td> converts a duration to another, with a different tick interval <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_duration_cast&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/floor.html" title="cpp/chrono/duration/floor"> <span class="t-lines"><span>floor<span class="t-dsc-small">(std::chrono::duration)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td> converts a duration to another, rounding down <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_floor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/ceil.html" title="cpp/chrono/duration/ceil"> <span class="t-lines"><span>ceil<span class="t-dsc-small">(std::chrono::duration)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td> converts a duration to another, rounding up <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_ceil&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/round.html" title="cpp/chrono/duration/round"> <span class="t-lines"><span>round<span class="t-dsc-small">(std::chrono::duration)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td> converts a duration to another, rounding to nearest, ties to even <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_round&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration/abs.html" title="cpp/chrono/duration/abs"> <span class="t-lines"><span>abs<span class="t-dsc-small">(std::chrono::duration)</span></span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div>
</td>
<td> obtains the absolute value of the duration <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/duration/dsc_abs&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration&action=edit&section=4" title="Edit section: Helper types">edit</a>]</span> <span class="mw-headline" id="Helper_types">Helper types</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td> Type
</td>
<td> Definition
</td></tr>
<tr class="t-dsc">
<td> <span class="t-lc">std::chrono::nanoseconds</span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1"><</span><span class="coMULTI">/*signed integer type of at least 64 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1267">std::<span class="me2">nano</span></span></a><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <span class="t-lc">std::chrono::microseconds</span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1"><</span><span class="coMULTI">/*signed integer type of at least 55 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1268">std::<span class="me2">micro</span></span></a><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <span class="t-lc">std::chrono::milliseconds</span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1"><</span><span class="coMULTI">/*signed integer type of at least 45 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1269">std::<span class="me2">milli</span></span></a><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <span class="t-lc">std::chrono::seconds</span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1"><</span><span class="coMULTI">/*signed integer type of at least 35 bits*/</span><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <span class="t-lc">std::chrono::minutes</span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1"><</span><span class="coMULTI">/*signed integer type of at least 29 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1263">std::<span class="me2">ratio</span></span></a><span class="sy1"><</span><span class="nu0">60</span><span class="sy1">>></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <span class="t-lc">std::chrono::hours</span>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">duration<span class="sy1"><</span><span class="coMULTI">/*signed integer type of at least 23 bits*/</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1263">std::<span class="me2">ratio</span></span></a><span class="sy1"><</span><span class="nu0">3600</span><span class="sy1">>></span></span></span>
</td></tr>
</table>
<p>Note: each of the predefined duration types covers a range of at least ±292 years.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration&action=edit&section=5" title="Edit section: Helper classes">edit</a>]</span> <span class="mw-headline" id="Helper_classes">Helper classes</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="treat_as_floating_point.html" title="cpp/chrono/treat as floating point"> <span class="t-lines"><span>treat_as_floating_point</span></span></a></div></div>
</td>
<td> indicates that a duration is convertible to duration with different tick period <br /> <span class="t-mark">(class template)</span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="duration_values.html" title="cpp/chrono/duration values"> <span class="t-lines"><span>duration_values</span></span></a></div></div>
</td>
<td> constructs zero, min, and max values of a tick count of given type <br /> <span class="t-mark">(class template)</span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration&action=edit&section=6" title="Edit section: Literals">edit</a>]</span> <span class="mw-headline" id="Literals">Literals</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in inline namespace <code>std::literals::chrono_literals</code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="operator""h.html" title="cpp/chrono/operator""h"> <span class="t-lines"><span>operator""h</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td> A <span class="t-lc">std::chrono::duration</span> literal representing hours <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/dsc_operator%22%22h&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="operator""min.html" title="cpp/chrono/operator""min"> <span class="t-lines"><span>operator""min</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td> A <span class="t-lc">std::chrono::duration</span> literal representing minutes <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/dsc_operator%22%22min&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="operator""s.html" title="cpp/chrono/operator""s"> <span class="t-lines"><span>operator""s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td> A <span class="t-lc">std::chrono::duration</span> literal representing seconds <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/dsc_operator%22%22s&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="operator""ms.html" title="cpp/chrono/operator""ms"> <span class="t-lines"><span>operator""ms</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td> A <span class="t-lc">std::chrono::duration</span> literal representing milliseconds <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/dsc_operator%22%22ms&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="operator""us.html" title="cpp/chrono/operator""us"> <span class="t-lines"><span>operator""us</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td> A <span class="t-lc">std::chrono::duration</span> literal representing microseconds <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/dsc_operator%22%22us&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="operator""ns.html" title="cpp/chrono/operator""ns"> <span class="t-lines"><span>operator""ns</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div>
</td>
<td> A <span class="t-lc">std::chrono::duration</span> literal representing nanoseconds <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/dsc_operator%22%22ns&action=edit">[edit]</a></span>
</td></tr>
</table>
<p><br />
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/duration&action=edit&section=7" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><p> This example shows how to define several custom duration types and convert between types:
</p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <iostream></span>
<span class="co2">#include <chrono></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">using</span> shakes <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span><span class="kw4">int</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1263">std::<span class="me2">ratio</span></span></a><span class="sy1"><</span><span class="nu0">1</span>, <span class="nu0">100000000</span><span class="sy1">>></span><span class="sy4">;</span>
<span class="kw1">using</span> jiffies <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span><span class="kw4">int</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1270">std::<span class="me2">centi</span></span></a><span class="sy1">></span><span class="sy4">;</span>
<span class="kw1">using</span> microfortnights <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span><span class="kw4">float</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1263">std::<span class="me2">ratio</span></span></a><span class="sy1"><</span><span class="nu0">12096</span>,<span class="nu0">10000</span><span class="sy1">>></span><span class="sy4">;</span>
<span class="kw1">using</span> nanocenturies <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span><span class="kw4">float</span>, <a href="../numeric/ratio/ratio.html"><span class="kw1263">std::<span class="me2">ratio</span></span></a><span class="sy1"><</span><span class="nu0">3155</span>,<span class="nu0">1000</span><span class="sy1">>></span><span class="sy4">;</span>
 
std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span> sec<span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
 
<a href="../io/cout.html"><span class="kw1474">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"1 second is:<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
<a href="../io/cout.html"><span class="kw1474">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="duration/duration_cast.html"><span class="kw871">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration_cast</span></span></a><span class="sy1"><</span>shakes<span class="sy1">></span><span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1"><<</span> <span class="st0">" shakes<span class="es1">\n</span>"</span><span class="sy4">;</span>
<a href="../io/cout.html"><span class="kw1474">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="duration/duration_cast.html"><span class="kw871">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration_cast</span></span></a><span class="sy1"><</span>jiffies<span class="sy1">></span><span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1"><<</span> <span class="st0">" jiffies<span class="es1">\n</span>"</span><span class="sy4">;</span>
<a href="../io/cout.html"><span class="kw1474">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> microfortnights<span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" microfortnights<span class="es1">\n</span>"</span><span class="sy4">;</span>
<a href="../io/cout.html"><span class="kw1474">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> nanocenturies<span class="br0">(</span>sec<span class="br0">)</span>.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">" nanocenturies<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">1 second is:
100000000 shakes
100 jiffies
0.82672 microfortnights
0.316957 nanocenturies</pre></div></div>
</div>
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