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

std::chrono::round(std::chrono::time_point): std::chrono::round(std::chrono::time_point)

NAME

std::chrono::round(std::chrono::time_point) - std::chrono::round(std::chrono::time_point)

Synopsis

Defined in header <chrono>
template <class ToDuration, class Clock, class Duration> (since C++17)
constexpr time_point<Clock, ToDuration> round(const time_point<Clock, Duration>& tp);

Returns the nearest time point to tp representable in ToDuration, rounding to even in halfway cases.
The function does not participate in the overload resolution unless ToDuration is an specialization of std::chrono::duration and std::chrono::treat_as_floating_point<typename ToDuration::rep>::value is false.

Parameters

tp - time point to round to nearest

Return value

d rounded to nearest time point using duration of type ToDuration, rounding to even in halfway cases.

Possible implementation

  template <class T> struct is_duration : std::false_type {};
  template <class Rep, class Period> struct is_duration<
      std::chrono::duration<Rep, Period>> : std::true_type {};

  template <class To, class Clock, class FromDuration,
            class = std::enable_if_t<is_duration<To>{}
               && !std::chrono::treat_as_floating_point<typename To::rep>{}>>
  constexpr std::chrono::time_point<Clock, To> round(
      const std::chrono::time_point<Clock, FromDuration>& tp)
  {
      return std::chrono::time_point<Clock, To>{
          std::chrono::round<To>(tp.time_since_epoch())};
  }

Example

 This section is incomplete
 Reason: no example