Defined in header <chrono> | ||
---|---|---|
template <class ToDuration, class Clock, class Duration> constexpr time_point<Clock, ToDuration> round(const time_point<Clock, Duration>& tp); | (since C++17) |
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
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 down (function template) |
(C++17) | converts a duration to another, rounding to nearest, ties to even (function template) |
(C++11)(C++11)(C++11) | nearest integer, rounding away from zero in halfway cases (function) |
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