chrono库简单使用：手动计时器实现

#include <cstdio>
#include <chrono>
#include <fstream>
#include <iostream>

using namespace std;
double MSleep(int iTime);


int main(int argc,char ** argv){
	fstream file1;
	file1.open("C:\\Users\\LI\\Desktop\\temp.txt", ios::app);

	std::chrono::steady_clock::time_point _start_time = std::chrono::steady_clock::now();
	file1 << MSleep(2000)*1000 << "ms" << endl;
	std::chrono::steady_clock::time_point _end_time = std::chrono::steady_clock::now();
	std::chrono::duration<double> diff = _end_time - _start_time;

	file1 << diff.count() * 1000 << "ms" << endl;
	file1.close();
	return 0;
}

double MSleep(int iTime){
	std::chrono::steady_clock::time_point _start_time = std::chrono::steady_clock::now();
	if (iTime <= 0)
	{
		return 0;
	}
	std::chrono::steady_clock::time_point _end_time;
	std::chrono::duration<double> diff;
	do{
		_end_time = std::chrono::steady_clock::now();
		diff = _end_time - _start_time;
	} while (diff.count() <= double(iTime/1000));
	return diff.count();
}

chrono-C++文档：http://www.cplusplus.com/reference/chrono/
参考：https://www.cnblogs.com/shaogang/p/10806947.html