std::chrono::time_point<Clock,Duration>::time_point
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std::chrono::time_point
Member functions
time_point::time_point
(C++20)(C++20)
Non-member functions
(until C++20)(C++20)
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Helper classes
(C++26)
(1)
time_point();
(since C++11) (constexpr since C++14)
(2)
explicit time_point( const duration& d );
(since C++11) (constexpr since C++14)
(3)
template< class Duration2 >
time_point( const time_point<Clock, Duration2>& t );
(since C++11) time_point( const time_point<Clock, Duration2>& t );
(constexpr since C++14)
Constructs a new time_point from one of several optional data sources.
1) Default constructor, creates a
time_point representing the Clock's epoch (i.e., time_since_epoch() is zero).2) Constructs a
time_point at Clock's epoch plus d.3) Constructs a
time_point by converting t to duration. This constructor only participates in overload resolution if Duration2 is implicitly convertible to duration.[edit] Parameters
d
-
a
duration to copy from
t
-
a
time_point to convert from
[edit] Example
Run this code
#include <chrono> #include <iostream> using Clock = std::chrono::steady_clock ; using TimePoint = std::chrono::time_point <Clock>; void print_ms(const TimePoint& point) { using Ms = std::chrono::milliseconds ; const Clock::duration since_epoch = point.time_since_epoch(); std::cout << std::chrono::duration_cast <Ms>(since_epoch) << '\n'; } int main() { const TimePoint default_value = TimePoint(); // (1) print_ms(default_value); // 0ms const Clock::duration duration_4_seconds = std::chrono::seconds (4); const TimePoint time_point_4_seconds(duration_4_seconds); // (2) // 4 seconds from start of epoch print_ms(time_point_4_seconds); // 4000ms const TimePoint time_point_now = Clock::now(); // (3) print_ms(time_point_now); // 212178842ms }
Possible output:
0ms 4000ms 212178842ms