std::chrono::floor(std::chrono::duration) (3) - Linux Manuals

std::chrono::floor(std::chrono::duration): std::chrono::floor(std::chrono::duration)


std::chrono::floor(std::chrono::duration) - std::chrono::floor(std::chrono::duration)


Defined in header <chrono>
template <class ToDuration, class Rep, class Period> (since C++17)
constexpr ToDuration floor(const duration<Rep, Period>& d);

Returns the greatest duration t representable in ToDuration that is less or equal to d.
The function does not participate in the overload resolution unless ToDuration is an instance of std::chrono::duration.


d - duration to convert

Return value

d rounded down to a duration of type ToDuration.

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 Rep, class Period,
            class = std::enable_if_t<is_duration<To>{}>>
  constexpr To floor(const duration<Rep, Period>& d)
      To t = std::chrono::duration_cast<To>(d);
      if (t > d)
          return t - To{1};
      return t;


 This section is incomplete
 Reason: no example

See also

                               converts a duration to another, with a different tick interval
duration_cast (function template)

ceil(std::chrono::duration) converts a duration to another, rounding up
                               (function template)

round(std::chrono::duration) converts a duration to another, rounding to nearest, ties to even
                               (function template)

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

floorl nearest integer not greater than the given value