QueryPerformance : C++精确计时开箱即用

三步走

step 1 包含头文件

#include <windows.h>

step2 下面的代码放在计时开始处

LARGE_INTEGER tbg, tend, tfre;
QueryPerformanceFrequency(&tfre);
//开始计时
QueryPerformanceCounter(&tbg);

step 3 下面的代码放在计时结束处

//结束计时
QueryPerformanceCounter(&tend);
double locateTime = (double)(tend.QuadPart - tbg.QuadPart) / (double)tfre.QuadPart;
std::clog << "locateTime = " << locateTime << " s" << std::endl;