std::chrono::time_point_cast
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< cpp | chrono | time point
Defined in header <chrono>
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template< class ToDuration, class Clock, class Duration > std::chrono::time_point<Clock, ToDuration> |
(since C++11) (until C++14) |
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template< class ToDuration, class Clock, class Duration > constexpr std::chrono::time_point<Clock, ToDuration> |
(since C++14) | |
Converts a std::chrono::time_point from one duration to another.
time_point_cast
participates in overload resolution only if ToDuration
is a specialization of std::chrono::duration.
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[edit] Parameters
t | - | time_point to convert from
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[edit] Return value
std::chrono::time_point<Clock, ToDuration>(
std::chrono::duration_cast<ToDuration>(t.time_since_epoch())).
[edit] Example
Run this code
#include <chrono> #include <iostream> using namespace std::chrono_literals; using Clock = std::chrono::high_resolution_clock; using Ms = std::chrono::milliseconds; using Sec = std::chrono::seconds; template<class Duration> using TimePoint = std::chrono::time_point<Clock, Duration>; inline void print_ms(const TimePoint<Ms>& time_point) { std::cout << time_point.time_since_epoch().count() << " ms\n"; } int main() { TimePoint<Sec> time_point_sec{4s}; // implicit cast, no precision loss TimePoint<Ms> time_point_ms{time_point_sec}; print_ms(time_point_ms); // 4000 ms time_point_ms = TimePoint<Ms>{5756ms}; print_ms(time_point_ms); // 5756 ms // explicit cast, need when precision loss may happen // 5756 truncated to 5000 time_point_sec = std::chrono::time_point_cast<Sec>(time_point_ms); print_ms(time_point_sec); // 5000 ms }
Output:
4000 ms 5756 ms 5000 ms
[edit] See also
converts a time_point to another, rounding down (function template) | |
converts a time_point to another, rounding up (function template) | |
converts a time_point to another, rounding to nearest, ties to even (function template) | |
(C++11) |
converts a duration to another, with a different tick interval (function template) |