| Defined in header <chrono> | ||
|---|---|---|
template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> floor(const time_point<Clock, Duration>& tp); | (since C++17) |
Returns the largest time point t representable in ToDuration that is smaller or equal to tp.
The function does not participate in the overload resolution unless ToDuration is an specialization of std::chrono::duration.
Parameters
| tp | - | time point to round down |
Return value
d rounded down to a the next time point using 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 Clock, class FromDuration,
class = std::enable_if_t<is_duration<To>{}>>
constexpr std::chrono::time_point<Clock, To>
floor(const std::chrono::time_point<Clock, FromDuration>& tp)
{
return std::chrono::time_point<Clock, To>{
std::chrono::floor<To>(tp.time_since_epoch())};
} |
Example
See also
| converts a time point to another time point on the same clock, with a different duration (function template) | |
| (C++17) | converts a time_point to another, rounding up (function template) |
| (C++17) | converts a time_point to another, rounding to nearest, ties to even (function template) |
| (C++17) | converts a duration to another, rounding down (function template) |
| nearest integer not greater than the given value (function) |
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