| (1) | ||
time_point(); | (since C++11) (until C++14) | |
constexpr time_point(); | (since C++14) | |
| (2) | ||
explicit time_point( const duration& d ); | (since C++11) (until C++14) | |
constexpr explicit time_point( const duration& d ); | (since C++14) | |
| (3) | ||
template< class Duration2 > time_point( const time_point<Clock,Duration2>& t ); | (since C++11) (until C++14) | |
template< class Duration2 > constexpr time_point( const time_point<Clock,Duration2>& t ); | (since C++14) |
Constructs a new time_point from one of several optional data sources.
1) Default constructor, creates a
time_point with a value of Clock's epoch. 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.Parameters
| d | - | a duration to copy from |
| t | - | a time_point to convert from |
Example
#include <chrono>
#include <iostream>
using Clock = std::chrono::high_resolution_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).count() << " ms\n";
}
int main()
{
const TimePoint default_value = TimePoint(); // (1)
print_ms(default_value); // 0 ms
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); // 4000 ms
const TimePoint time_point_now = Clock::now(); // (3)
print_ms(time_point_now); // 43098276 ms
}Possible output:
0 ms 4000 ms 43098276 ms
See also
| constructs new duration (public member function of std::chrono::duration) | |
| converts a duration to another, with a different tick interval (function template) |
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