运行时间拿捏住了——C++计时方法汇总

1. QueryPerformance

step1 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);

 

step3 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;

 

2. chrono

step1 包含头文件

#include <chrono>

 

step2 下面的代码放在计时开始处

std::chrono::steady_clock::time_point start_time = std::chrono::steady_clock::now();

 

step3 下面的代码放在计时结束处

std::chrono::steady_clock::time_point end_time = std::chrono::steady_clock::now();
std::cout << "Time elapsed: " << std::chrono::duration_cast<std::chrono::milliseconds>(end_time - start_time).count() << "ms" << std::endl;