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

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

NAME

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

Synopsis

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.

Parameters

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;
  }

Example

 This section is incomplete
 Reason: no example