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<div class="t-navbar-sep"> </div>
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<p>This header is part of the <a href="../chrono.html" title="cpp/chrono">date and time</a> library.
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<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1">
<a href="chrono.html%23Classes"><span class="tocnumber">1</span> <span class="toctext">Classes</span></a>
<ul>
<li class="toclevel-2"><a href="chrono.html%23Convenience_Typedefs"><span class="tocnumber">1.1</span> <span class="toctext">Convenience Typedefs</span></a></li>
<li class="toclevel-2"><a href="chrono.html%23Specializations"><span class="tocnumber">1.2</span> <span class="toctext">Specializations</span></a></li>
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</li>
<li class="toclevel-1 tocsection-2">
<a href="chrono.html%23Functions"><span class="tocnumber">2</span> <span class="toctext">Functions</span></a>
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<li class="toclevel-2"><a href="chrono.html%23Duration"><span class="tocnumber">2.1</span> <span class="toctext">Duration</span></a></li>
<li class="toclevel-2"><a href="chrono.html%23Time_point"><span class="tocnumber">2.2</span> <span class="toctext">Time point</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-3"><a href="chrono.html%23Synopsis"><span class="tocnumber">3</span> <span class="toctext">Synopsis</span></a></li>
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</td></tr></table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Classes">edit</a>]</span> <span class="mw-headline" id="Classes">Classes</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in  namespace <code>std::chrono</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="../chrono/duration.html" title="cpp/chrono/duration"> <span class="t-lines"><span>duration</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>   a time interval  <br> <span class="t-mark">(class template)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="../chrono/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>
<td>   wall clock time from the system-wide realtime clock   <br> <span class="t-mark">(class)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="../chrono/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>
<td>   monotonic clock that will never be adjusted  <br> <span class="t-mark">(class)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="../chrono/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>
<td>   the clock with the shortest tick period available  <br> <span class="t-mark">(class)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="../chrono/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>
<td>   a point in time  <br> <span class="t-mark">(class template)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/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="../chrono/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>



<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Convenience_Typedefs"> Convenience Typedefs </span>
</h5>
</td>
</tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in  namespace <code>std::chrono</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <span class="t-lc"><a href="../chrono/duration.html" title="cpp/chrono/duration">std::chrono::nanoseconds</a></span>
</td>
<td>  duration type with Period <span class="t-lc"><a href="../numeric/ratio/ratio.html" title="cpp/numeric/ratio/ratio">std::nano</a></span>
</td>
</tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><a href="../chrono/duration.html" title="cpp/chrono/duration">std::chrono::microseconds</a></span>
</td>
<td>  duration type with Period <span class="t-lc"><a href="../numeric/ratio/ratio.html" title="cpp/numeric/ratio/ratio">std::micro</a></span>
</td>
</tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><a href="../chrono/duration.html" title="cpp/chrono/duration">std::chrono::milliseconds</a></span>
</td>
<td>  duration type with Period <span class="t-lc"><a href="../numeric/ratio/ratio.html" title="cpp/numeric/ratio/ratio">std::milli</a></span>
</td>
</tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><a href="../chrono/duration.html" title="cpp/chrono/duration">std::chrono::seconds</a></span>
</td>
<td>  duration type with Period <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../numeric/ratio/ratio.html"><span class="kw1231">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">1</span><span class="sy1">&gt;</span></span></span>
</td>
</tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><a href="../chrono/duration.html" title="cpp/chrono/duration">std::chrono::minutes</a></span>
</td>
<td>  duration type with Period <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../numeric/ratio/ratio.html"><span class="kw1231">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">60</span><span class="sy1">&gt;</span></span></span>
</td>
</tr>


<tr class="t-dsc">
<td>  <span class="t-lc"><a href="../chrono/duration.html" title="cpp/chrono/duration">std::chrono::hours</a></span>
</td>
<td>  duration type with Period <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../numeric/ratio/ratio.html"><span class="kw1231">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">3600</span><span class="sy1">&gt;</span></span></span>
</td>
</tr>



<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Specializations"> Specializations </span>
</h5>
</td>
</tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in  namespace <code>std</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/duration/common_type.html" title="cpp/chrono/duration/common type"> <span class="t-lines"><span>std::common_type<span class="t-dsc-small">&lt;std::chrono::duration&gt;</span></span></span></a></div></div>
</td>
<td>   specializes the <span class="t-lc"><a href="../types/common_type.html" title="cpp/types/common type">std::common_type</a></span> trait <br> <span class="t-mark">(class template specialization)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/time_point/common_type.html" title="cpp/chrono/time point/common type"> <span class="t-lines"><span>std::common_type<span class="t-dsc-small">&lt;std::chrono::time_point&gt;</span></span></span></a></div></div>
</td>
<td>   specializes the <span class="t-lc"><a href="../types/common_type.html" title="cpp/types/common type">std::common_type</a></span> trait <br> <span class="t-mark">(class template specialization)</span> 
</td>
</tr>
</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Functions">edit</a>]</span> <span class="mw-headline" id="Functions">Functions</span>
</h3>
<table class="t-dsc-begin">

<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Duration"> Duration </span>
</h5>
</td>
</tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in  namespace <code>std::chrono</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/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> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/duration/operator_cmp.html" title="cpp/chrono/duration/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&lt;=</span><span>operator&gt;</span><span>operator&gt;=</span></span></a></div></div>
</td>
<td>   compares two durations <br> <span class="t-mark">(function template)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/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> 
</td>
</tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Time_point"> Time point </span>
</h5>
</td>
</tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in  namespace <code>std::chrono</code> </div>
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/time_point/operator_arith2.html" title="cpp/chrono/time point/operator arith2"> <span class="t-lines"><span>operator+</span><span>operator-</span></span></a></div></div>
</td>
<td>   modifies the time point by the given duration <br> <span class="t-mark">(function template)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/time_point/operator_cmp.html" title="cpp/chrono/time point/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&lt;=</span><span>operator&gt;</span><span>operator&gt;=</span></span></a></div></div>
</td>
<td>   compares two time points <br> <span class="t-mark">(function template)</span> 
</td>
</tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../chrono/time_point/time_point_cast.html" title="cpp/chrono/time point/time point cast"> <span class="t-lines"><span>time_point_cast</span></span></a></div></div>
</td>
<td>   converts a time point to another time point on the same clock, with a different duration <br> <span class="t-mark">(function template)</span> 
</td>
</tr>
</table>
<p><br>
</p>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Synopsis">edit</a>]</span> <span class="mw-headline" id="Synopsis">Synopsis</span>
</h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">namespace</span> chrono <span class="br0">{</span>
 
    <span class="co1">// class template duration</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep, <span class="kw1">class</span> Period <span class="sy1">=</span> ratio<span class="sy1">&lt;</span><span class="nu0">1</span><span class="sy1">&gt;</span> <span class="sy1">&gt;</span> <span class="kw1">class</span> duration<span class="sy4">;</span>
 
    <span class="co1">// class template time_point</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration <span class="sy1">=</span> <span class="kw1">typename</span> Clock<span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&gt;</span> <span class="kw1">class</span> time_point<span class="sy4">;</span>
 
<span class="br0">}</span> <span class="co1">// namespace chrono</span>
 
<span class="co1">// common_type specializations</span>
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
    <span class="kw1">struct</span> common_type<span class="sy1">&lt;</span>chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span>, chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;&gt;</span><span class="sy4">;</span>
 
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
    <span class="kw1">struct</span> common_type<span class="sy1">&lt;</span>chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span>, chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;&gt;</span><span class="sy4">;</span>
 
<span class="kw1">namespace</span> chrono <span class="br0">{</span>
 
    <span class="co1">// customization traits</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep<span class="sy1">&gt;</span> <span class="kw1">struct</span> treat_as_floating_point<span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep<span class="sy1">&gt;</span> <span class="kw1">struct</span> duration_values<span class="sy4">;</span>
 
    <span class="co1">// duration arithmetic</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span>, duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;&gt;</span><span class="sy4">::</span><span class="me2">type</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">+</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span>, duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;&gt;</span><span class="sy4">::</span><span class="me2">type</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period, <span class="kw1">class</span> Rep2<span class="sy1">&gt;</span>
        duration<span class="sy1">&lt;</span><span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Rep1, Rep2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span>, Period<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">*</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period<span class="sy1">&gt;</span><span class="sy3">&amp;</span> d, <span class="kw4">const</span> Rep2<span class="sy3">&amp;</span> s<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period<span class="sy1">&gt;</span>
        duration<span class="sy1">&lt;</span><span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Rep1, Rep2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span>, Period<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">*</span><span class="br0">(</span><span class="kw4">const</span> Rep1<span class="sy3">&amp;</span> s, <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period<span class="sy1">&gt;</span><span class="sy3">&amp;</span> d<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period, <span class="kw1">class</span> Rep2<span class="sy1">&gt;</span>
        duration<span class="sy1">&lt;</span><span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Rep1, Rep2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span>, Period<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">/</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period<span class="sy1">&gt;</span><span class="sy3">&amp;</span> d, <span class="kw4">const</span> Rep2<span class="sy3">&amp;</span> s<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Rep1, Rep2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">/</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period, <span class="kw1">class</span> Rep2<span class="sy1">&gt;</span>
        duration<span class="sy1">&lt;</span><span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Rep1, Rep2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span>, Period<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">%</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period<span class="sy1">&gt;</span><span class="sy3">&amp;</span> d, <span class="kw4">const</span> Rep2<span class="sy3">&amp;</span> s<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span>, duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;&gt;</span><span class="sy4">::</span><span class="me2">type</span>
        <span class="kw4">constexpr</span> operator<span class="sy2">%</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// duration comparisons</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                                    <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                                    <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&lt;</span> <span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                                    <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                                    <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&gt;</span> <span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                                    <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                                    <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// duration_cast </span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> ToDuration, <span class="kw1">class</span> Rep, <span class="kw1">class</span> Period<span class="sy1">&gt;</span> 
        <span class="kw4">constexpr</span> ToDuration duration_cast<span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep, Period<span class="sy1">&gt;</span><span class="sy3">&amp;</span> d<span class="br0">)</span><span class="sy4">;</span> 
 
    <span class="co1">// convenience typedefs </span>
    <span class="kw1">typedef</span> duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 64 bits*/</span>, nano<span class="sy1">&gt;</span>        nanoseconds<span class="sy4">;</span>
    <span class="kw1">typedef</span> duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 55 bits*/</span>, micro<span class="sy1">&gt;</span>       microseconds<span class="sy4">;</span>
    <span class="kw1">typedef</span> duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 45 bits*/</span>, milli<span class="sy1">&gt;</span>       milliseconds<span class="sy4">;</span>
    <span class="kw1">typedef</span> duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 35 bits*/</span> <span class="sy1">&gt;</span>             seconds<span class="sy4">;</span>
    <span class="kw1">typedef</span> duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 29 bits*/</span>, ratio<span class="sy1">&lt;</span> <span class="nu0">60</span><span class="sy1">&gt;&gt;</span>  minutes<span class="sy4">;</span> 
    <span class="kw1">typedef</span> duration<span class="sy1">&lt;</span><span class="coMULTI">/*signed integer type of at least 23 bits*/</span>, ratio<span class="sy1">&lt;</span><span class="nu0">3600</span><span class="sy1">&gt;&gt;</span> hours<span class="sy4">;</span> 
 
    <span class="co1">// time_point arithmetic</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        time_point<span class="sy1">&lt;</span>Clock, <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Duration1, duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;&gt;</span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">&gt;</span>
        operator<span class="sy2">+</span><span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Rep1, <span class="kw1">class</span> Period1, <span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        time_point<span class="sy1">&lt;</span>Clock, <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span>, Duration2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">&gt;</span>
        operator<span class="sy2">+</span><span class="br0">(</span><span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep1, Period1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Rep2, <span class="kw1">class</span> Period2<span class="sy1">&gt;</span>
        time_point<span class="sy1">&lt;</span>Clock, <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Duration1, duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;&gt;</span><span class="sy4">::</span><span class="me2">type</span><span class="sy1">&gt;</span>
        operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> duration<span class="sy1">&lt;</span>Rep2, Period2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        <span class="kw1">typename</span> common_type<span class="sy1">&lt;</span>Duration1, Duration2<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">type</span>
        operator<span class="sy2">-</span><span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// time_point comparisons</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                        <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                        <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        <span class="kw4">bool</span> operator<span class="sy1">&lt;</span> <span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                        <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        <span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                        <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        <span class="kw4">bool</span> operator<span class="sy1">&gt;</span> <span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                        <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration1, <span class="kw1">class</span> Duration2<span class="sy1">&gt;</span>
        <span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,
                        <span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// time_point_cast</span>
    <span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> ToDuration, <span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration<span class="sy1">&gt;</span>
        time_point<span class="sy1">&lt;</span>Clock, ToDuration<span class="sy1">&gt;</span> time_point_cast<span class="br0">(</span><span class="kw4">const</span> time_point<span class="sy1">&lt;</span>Clock, Duration<span class="sy1">&gt;</span><span class="sy3">&amp;</span> t<span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// clocks</span>
    <span class="kw1">class</span> system_clock<span class="sy4">;</span>
    <span class="kw1">class</span> steady_clock<span class="sy4">;</span>
    <span class="kw1">class</span> high_resolution_clock<span class="sy4">;</span>
 
<span class="br0">}</span> <span class="co1">// namespace chrono</span>
<span class="br0">}</span><span class="co1">// namespace std</span></pre></div></div>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr>
<td class="mbox-empty-cell"></td>
<td class="mbox-text" style="">This section is incomplete<br>Reason: Class synopses </td>
</tr></table>

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