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Showing content from https://timsong-cpp.github.io/cppwp/n4140/time.syn below:

20 General utilities library [utilities]

20.12.2 Header <chrono> synopsis [time.syn]
namespace std {
namespace chrono {

template <class Rep, class Period = ratio<1> > class duration;

template <class Clock, class Duration = typename Clock::duration> class time_point;

}  
template <class Rep1, class Period1, class Rep2, class Period2>
  struct common_type<chrono::duration<Rep1, Period1>, chrono::duration<Rep2, Period2>>;

template <class Clock, class Duration1, class Duration2>
  struct common_type<chrono::time_point<Clock, Duration1>, chrono::time_point<Clock, Duration2>>;

namespace chrono {

template <class Rep> struct treat_as_floating_point;
template <class Rep> struct duration_values;

template <class Rep1, class Period1, class Rep2, class Period2>
  common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>
  constexpr operator+(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period1, class Rep2, class Period2>
  common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>
  constexpr operator-(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period, class Rep2>
  duration<common_type_t<Rep1, Rep2>, Period>
  constexpr operator*(const duration<Rep1, Period>& d, const Rep2& s);
template <class Rep1, class Rep2, class Period>
  duration<common_type_t<Rep1, Rep2>, Period>
  constexpr operator*(const Rep1& s, const duration<Rep2, Period>& d);
template <class Rep1, class Period, class Rep2>
  duration<common_type_t<Rep1, Rep2>, Period>
  constexpr operator/(const duration<Rep1, Period>& d, const Rep2& s);
template <class Rep1, class Period1, class Rep2, class Period2>
  common_type_t<Rep1, Rep2>
  constexpr operator/(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period, class Rep2>
  duration<common_type_t<Rep1, Rep2>, Period>
  constexpr operator%(const duration<Rep1, Period>& d, const Rep2& s);
template <class Rep1, class Period1, class Rep2, class Period2>
  common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>
  constexpr operator%(const duration<Rep1, Period1>& lhs, const duration<Rep2, Period2>& rhs);

template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator==(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator!=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator< (const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator<=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator> (const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator>=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);

template <class ToDuration, class Rep, class Period>
  constexpr ToDuration duration_cast(const duration<Rep, Period>& d);

typedef duration<signed integer type of at least 64 bits,        nano> nanoseconds;
typedef duration<signed integer type of at least 55 bits,       micro> microseconds;
typedef duration<signed integer type of at least 45 bits,       milli> milliseconds;
typedef duration<signed integer type of at least 35 bits             > seconds;
typedef duration<signed integer type of at least 29 bits, ratio<  60>> minutes;
typedef duration<signed integer type of at least 23 bits, ratio<3600>> hours;

template <class Clock, class Duration1, class Rep2, class Period2>
  constexpr time_point<Clock, common_type_t<Duration1, duration<Rep2, Period2>>>
  operator+(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);
template <class Rep1, class Period1, class Clock, class Duration2>
  constexpr time_point<Clock, common_type_t<duration<Rep1, Period1>, Duration2>>
  operator+(const duration<Rep1, Period1>& lhs, const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Rep2, class Period2>
  constexpr time_point<Clock, common_type_t<Duration1, duration<Rep2, Period2>>>
  operator-(const time_point<Clock, Duration1>& lhs, const duration<Rep2, Period2>& rhs);
template <class Clock, class Duration1, class Duration2>
  constexpr common_type_t<Duration1, Duration2>
  operator-(const time_point<Clock, Duration1>& lhs, const time_point<Clock, Duration2>& rhs);

template <class Clock, class Duration1, class Duration2>
   constexpr bool operator==(const time_point<Clock, Duration1>& lhs,
                             const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
   constexpr bool operator!=(const time_point<Clock, Duration1>& lhs,
                             const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
   constexpr bool operator< (const time_point<Clock, Duration1>& lhs,
                             const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
   constexpr bool operator<=(const time_point<Clock, Duration1>& lhs,
                             const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
   constexpr bool operator> (const time_point<Clock, Duration1>& lhs,
                             const time_point<Clock, Duration2>& rhs);
template <class Clock, class Duration1, class Duration2>
   constexpr bool operator>=(const time_point<Clock, Duration1>& lhs,
                             const time_point<Clock, Duration2>& rhs);

template <class ToDuration, class Clock, class Duration>
  constexpr time_point<Clock, ToDuration>
  time_point_cast(const time_point<Clock, Duration>& t);

class system_clock;
class steady_clock;
class high_resolution_clock;

}  
inline namespace literals {
inline namespace chrono_literals {

constexpr chrono::hours                                 operator "" h(unsigned long long);
constexpr chrono::duration<unspecified, ratio<3600,1>> operator "" h(long double);
constexpr chrono::minutes                               operator "" min(unsigned long long);
constexpr chrono::duration<unspecified, ratio<60,1>>   operator "" min(long double);
constexpr chrono::seconds                               operator "" s(unsigned long long);
constexpr chrono::duration<unspecified>                operator "" s(long double);
constexpr chrono::milliseconds                          operator "" ms(unsigned long long);
constexpr chrono::duration<unspecified, milli>         operator "" ms(long double);
constexpr chrono::microseconds                          operator "" us(unsigned long long);
constexpr chrono::duration<unspecified, micro>         operator "" us(long double);
constexpr chrono::nanoseconds                           operator "" ns(unsigned long long);
constexpr chrono::duration<unspecified, nano>          operator "" ns(long double);

}  }  
namespace chrono {

using namespace literals::chrono_literals;

} 
}  

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