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：

1. system_clock: 起点是1970-01-01 00:00:00 UTC
2. steady_clock: 起点是系统启动时间，一般用于得到时间间隔
3. 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