C++获取当前时间戳

以下是两种C++获取当前时间戳的方法：

1.使用gettimeofday函数获取时间戳

#include <sys/time.h>
#include <iostream>

int main() {
    double timestamp;
    struct timeval time_v;
    gettimeofday(&time_v, NULL);
    timestamp = time_v.tv_sec * 1000 + time_v.tv_usec / 1000;
    std::cout << "now time: " << timestamp << std::endl;
    return 0;
}

2.封装gettimeofday函数获取时间戳

#include <sys/time.h>
#include <iostream>

double GetTimeStamp(void) {
    double timestamp;
    struct timeval time_v;
    gettimeofday(&time_v, NULL);
    timestamp = (time_v.tv_sec) + (time_v.tv_usec) / 1000000.0;
    return timestamp;
}

int main() {
    double timestamp = GetTimeStamp();
    std::cout << "now time: " << timestamp << std::endl;
    return 0;
}