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Showing content from https://cplusplus.com/time_point below:

class template

std::chrono::time_point

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

Time point

A time_point object expresses a point in time relative to a clock's epoch.

Internally, the object stores an object of a duration type, and uses the Clock type as a reference for its epoch.

Template parameters

Clock: A clock class, such as system_clock, steady_clock, high_resolution_clock or a custom clock class.
Duration: A duration type.

Member types The following aliases are member types of time_point. They are widely used as parameter and return types by member functions:

member type definition notes clock The first template parameter (Clock) The clock class (either system_clock, steady_clock, high_resolution_clock or a custom clock class). duration The second template parameter (Duration) The duration type used to represent the time point. rep duration::rep Type returned by duration::count. period duration::period The ratio type that represents the length of a period in seconds.

Member functions

(constructor): Construct time_point (public member function)

operators: Operators for time_point (function template)

time_since_epoch: Time since epoch (public member function)

static member functions

min: Minimum value of time_point (public static member function)

max: Maximum value of time_point (public static member function)

Non-member functions

operators: Operators for time_point (function template)