std::chrono::time_point (3) - Linux Manuals

std::chrono::time_point: std::chrono::time_point

NAME

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

Synopsis

Defined in header <chrono>
template<
class Clock, (since C++11)
class Duration = typename Clock::duration
> class time_point;

Class template std::chrono::time_point represents a point in time. It is implemented as if it stores a value of type Duration indicating the time interval from the start of the Clock's epoch.
Clock must meet the requirements for Clock
or be std::chrono::local_t
(since C++20).

Member types

Member type Definition
clock Clock, the clock on which this time point is measured
duration Duration, a std::chrono::duration type used to measure the time since epoch
rep Rep, an arithmetic type representing the number of ticks of the duration
period Period, a std::ratio type representing the tick period of the duration

Member functions

                 constructs a new time point
constructor (public member function)
                 returns the time point as duration since the start of its clock
time_since_epoch (public member function)
                 modifies the time point by the given duration
operator+= (public member function)
operator-=

operator++
operator++(int) increments or decrements the duration
operator-- (public member function)
operator--(int)

(C++20)

min returns the time point corresponding to the smallest duration
                 (public static member function)
[static]

max returns the time point corresponding to the largest duration
                 (public static member function)
[static]

Non-member functions

                                          specializes the std::common_type trait
std::common_type<std::chrono::time_point> (class template specialization)
                                          performs add and subtract operations involving a time point
operator+ (function template)
operator-

operator==
operator!= compares two time points
operator< (function template)
operator<=
operator>
operator>=
                                          converts a time point to another time point on the same clock, with a different duration
time_point_cast (function template)

floor(std::chrono::time_point) converts a time_point to another, rounding down
                                          (function template)
(C++17)

ceil(std::chrono::time_point) converts a time_point to another, rounding up
                                          (function template)
(C++17)

round(std::chrono::time_point) converts a time_point to another, rounding to nearest, ties to even
                                          (function template)
(C++17)

Example

// Run this code

  #include <iostream>
  #include <iomanip>
  #include <ctime>
  #include <chrono>

  int main()
  {
      std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
      std::time_t now_c = std::chrono::system_clock::to_time_t(now - std::chrono::hours(24));
      std::cout << "24 hours ago, the time was "
                << std::put_time(std::localtime(&now_c), "%F %T") << '\n';

      std::chrono::steady_clock::time_point start = std::chrono::steady_clock::now();
      std::cout << "Hello World\n";
      std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
      std::cout << "Printing took "
                << std::chrono::duration_cast<std::chrono::microseconds>(end - start).count()
                << "us.\n";
  }

Possible output:

  24 hours ago, the time was 2011-10-25 12:00:08
  Hello World
  Printing took 84us.