C++ 获取程序运行时间/时间戳 精确到毫秒

利用chrono

#include <iostream>#include <ctime>#include <ratio>#include <chrono>using namespace std::chrono;int main(){    high_resolution_clock::time_point t1 = high_resolution_clock::now(); //返回时间戳    // TODO    high_resolution_clock::time_point t2 = high_resolution_clock::now();    duration<double, std::milli> time_span = t2 - t1;    std::cout << time_span.count()  << std::endl;    return 0;}

from https://stackoverflow.com/questions/41077377/how-to-get-current-time-in-milliseconds