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

Defined in header <chrono>

template <class ToDuration, class Rep, class Period>
constexpr ToDuration floor(const duration<Rep, Period>& d);

(since C++17)

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

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)
        --t;
    return t;
}

Example

duration_cast	converts a duration to another, with a different tick interval (function template)
ceil(std::chrono::duration) (C++17)	converts a duration to another, rounding up (function template)
round(std::chrono::duration) (C++17)	converts a duration to another, rounding to nearest, ties to even (function template)
floor(std::chrono::time_point) (C++17)	converts a time_point to another, rounding down (function template)
floor	nearest integer not greater than the given value (function)

Links:

http://en.cppreference.com/w/cpp/chrono/duration/floor

doc_CPP

2025-01-10 15:47:30

Comments

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

Parameters

Return value

Possible implementation

Example

See also