std::chrono::time_point<Clock,Duration>::time_point

std::chrono::time_point<Clock,Duration>::time_point - cppreference.com

From cppreference.com

	(1)
`time_point();`			(since C++11) (constexpr since C++14)
		(2)
`explicit time_point( const duration& d );`				(since C++11) (constexpr since C++14)
			(3)
`template< class Duration2 > time_point( const time_point<Clock, Duration2>& t );`					(since C++11) (constexpr since C++14)

Constructs a new time_point from one of several optional data sources.

1) Default constructor, creates a time_point representing the Clock's epoch (i.e., time_since_epoch() is zero).

2) Constructs a time_point at Clock's epoch plus d.

3) Constructs a time_point by converting t to duration. This constructor only participates in overload resolution if Duration2 is implicitly convertible to duration.

Parameters

d	-	a `duration` to copy from
t	-	a `time_point` to convert from

Example

#include <chrono>
#include <iostream>

using Clock = std::chrono::steady_clock;
using TimePoint = std::chrono::time_point<Clock>;

void print_ms(const TimePoint& point) 
{
    using Ms = std::chrono::milliseconds;
    const Clock::duration since_epoch = point.time_since_epoch();
    std::cout << std::chrono::duration_cast<Ms>(since_epoch) << '\n';
}

int main() 
{
    const TimePoint default_value = TimePoint(); // (1)
    print_ms(default_value); // 0ms

    const Clock::duration duration_4_seconds = std::chrono::seconds(4);
    const TimePoint time_point_4_seconds(duration_4_seconds); // (2)
    // 4 seconds from start of epoch
    print_ms(time_point_4_seconds); // 4000ms

    const TimePoint time_point_now = Clock::now(); // (3)
    print_ms(time_point_now); // 212178842ms
}

Possible output:

	constructs new duration (public member function of `std::chrono::duration<Rep,Period>`) [edit]
	converts a duration to another, with a different tick interval (function template) [edit]

Parameters

Example

See also