C++：高精度运行时间测量

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/baidu_28446365/article/details/89293006

1、常规测量

#include <ctime>//需包含的头文件

long ibegin = 0;
double iend = 0.0;

ibegin = clock();

//运行代码块

iend += (double)(clock() - ibegin) / CLOCKS_PER_SEC;//运行时间
cout << "iend:" << iend << endl;
ofstream infile;//打印到文件
infile.open("work.txt");
infile << iend << "\n";
//printf("\n ME Time: %12.3f sec.\n", iend);
infile.close();

2、高精度测量

#include <ratio>
#include <chrono>
using namespace std::chrono;

high_resolution_clock::time_point t1 = high_resolution_clock::now();

//运动代码块

high_resolution_clock::time_point t2 = high_resolution_clock::now();
duration<double, std::milli> time_span = t2 - t1;