最近写毕业论文的程序,发现了一种更加优雅的统计时间方法,记录一下
chrono
主要利用<chrono>
这个时间库来实现,里面包含三种时钟:
-
system_clock
: 起点是1970-01-01 00:00:00 UTC -
steady_clock
: 起点是系统启动时间,一般用于得到时间间隔 -
high_resolution_clock
:高分辨率的版本
本次使用system_clock
code
RD.h
#include<iostream>
#include <chrono>
#define TIMEDEBUG
#ifdef TIMEDEBUG
#define RD(X) {RunDuration o;o.begin();##X;o.end(#X);}
class RunDuration {
public:
inline void begin() {
_start = std::chrono::system_clock::now();
}
inline void end(const char * msg) {
_end = std::chrono::system_clock::now();
_duration = (_end - _start);
std::cout << msg << " execute time :" << double(_duration.count()) << "s\n----------" << std::endl;
}
private:
std::chrono::system_clock::time_point _start;
std::chrono::system_clock::time_point _end;
std::chrono::duration<double> _duration;
};
#else
#define RD(X) X;
#endif
test
#include "DDC.h"
#include "RD.h"
#include<iostream>
void test_DDC();
int main() {
std::cout << "ddc start from here!" << std::endl;
RD(test_DDC());
system("pause");
return 0;
}
Reference
https://www.cnblogs.com/liuguoyao514257665/p/13323392.html
https://www.cnblogs.com/zhongpan/p/7490657.html