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std::chrono::time_point::time_point

STD：：时间：：时间[医]要点：：时间[医]点

​(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)

构造一个新的time_point来自几个可选数据源之一。

1%29默认构造函数，创建time_point价值为Clock%27S时代

2%29构造一个time_point在Clock%27S时代加d...

3%29构造一个time_point通过转换t到duration.此构造函数仅参与重载解析，如果Duration2隐式可转换为duration...

参数

d-a duration to copy from
t-a time_point to convert from

例

二次

#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
}

二次

可能的产出：

二次

0 ms
4000 ms
43098276 ms

二次

另见

(constructor)constructs new duration (public member function of std::chrono::duration)
duration_castconverts a duration to another, with a different tick interval (function template)

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