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std::chrono...::time_point(3)  C++ Standard Libary std::chrono...::time_point(3)

NAME
     std::chrono::time_point::time_point - std::chrono::time_point::time_point

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

	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 convert-
     ible to
	duration.

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

Example
     // Run this code

      #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:
      0ms
      4000ms
      212178842ms

See also
	constructor   constructs new duration
		      (public member function  of  std::chrono::duration<Rep,Pe-
     riod>)
	duration_cast  converts a duration to another, with a different tick in-
     terval
	(C++11)       (function template)

http://cppreference.com 	   2024.06.10	   std::chrono...::time_point(3)
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