去实现一下开始说的高精度计时器：

#ifndef _TimerClock_hpp_
#define _TimerClock_hpp_#include <iostream>
#include <chrono>using namespace std;
using namespace std::chrono;class TimerClock
{
public:TimerClock(){update();}~TimerClock(){}void update(){_start = high_resolution_clock::now();}//获取秒double getTimerSecond(){return getTimerMicroSec() * 0.000001;}//获取毫秒double getTimerMilliSec(){return getTimerMicroSec()*0.001;}//获取微妙long long getTimerMicroSec(){//当前时钟减去开始时钟的countreturn duration_cast<microseconds>(high_resolution_clock::now() - _start).count();}
private:time_point<high_resolution_clock>_start;
};#endif

测试：

#include "TimerClock.hpp"int main()
{TimerClock TC;int sum = 0;TC.update();for (int i = 0; i > 100000; i++){sum++;}cout << "cost time:" << TC.getTimerMilliSec() <<"ms"<< endl;cout << "cost time:" << TC.getTimerMicroSec() << "us" << endl;return 0;
}

结果：