timeConversion, C++ (vc++)

timeConversion

#include <iostream>
#include <chrono>
 
using Clock = std::chrono::system_clock;
using Ms = std::chrono::milliseconds;
using Us = std::chrono::microseconds;
using Ns = std::chrono::nanoseconds;
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";
}

inline void print_ns(const TimePoint<Ns>& time_point) 
{
    std::cout << time_point.time_since_epoch().count() << " ns\n";
}

inline void print_us(const TimePoint<Us>& time_point) 
{
    std::cout << time_point.time_since_epoch().count() << " us\n";
}

int main() 
{
    TimePoint<Sec> time_point_sec(Sec(4));
 
    // 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>(Ms(5756));
    
    // explicit cast, need when precision loss may happens
    // 5756 truncated to 5000
    time_point_sec = std::chrono::time_point_cast<Sec>(time_point_ms);
    print_ms(time_point_sec); // 5000 ms
    
    TimePoint<Us> time_point_us = TimePoint<Us>(Us(5756756));
    time_point_ms = std::chrono::time_point_cast<Ms>(time_point_us);
    print_us(time_point_ms);
    
    TimePoint<Ns> time_point_ns = TimePoint<Ns>(Ns(5987987987));
    time_point_us = std::chrono::time_point_cast<Us>(time_point_ns);
    print_ns(time_point_us);
    
    
}


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