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std::difftime

STD：：差异时间

Defined in header ​​
double difftime( std::time_t time_end, std::time_t time_beg ​​

计算两个日历时间之间的差异，如std::time_t物体%28time_end - time_beg%29秒。如果time_end指之前的时间点time_beg结果为阴性。

参数

time_beg, time_end-times to compare

返回值

两次差在几秒钟内。

注记

关于POSIX系统，std::time_t是以秒为单位的，difftime与算术相减相等，但C和C++允许小数单位用于time_t...

例

二次

#include <iostream>
#include <ctime>
 
int main()
{
    std::time_t start = std::time(NULL
    volatile double d;
 
    // some time-consuming operation
    for (int n=0; n<10000; ++n) {
        for (int m=0; m<100000; ++m) {
           d += d*n*m;
        }
    }
 
    std::cout << "Wall time passed: "
              << std::difftime(std::time(NULL), start) << " s.\n";
}

二次

产出：

二次

Wall time passed: 7 s.

二次

另见

duration (C++11)a time interval (class template)

C.关于扩散时间的文件

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