程序计时函数

// Author:   Tong Qin               [e-mail]
//           Shaozu Cao             [e-mail]

// 一个计时函数
#pragma once

#include <ctime>
#include <iostream>
#include <string>
#include <cstdlib>
#include <chrono>

class TicToc
{
public:
TicToc()
    {
tic();
    }

TicToc( bool _disp )
    {
disp_ = _disp;
tic();
    }

void tic()
    {
start = std::chrono::system_clock::now();
    }

void toc( std::string _about_task )
    {
end = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end - start;
double elapsed_ms = elapsed_seconds.count() * 1000;

if( disp_ )
        {
std::cout.precision(3); // 10 for sec, 3 for ms 
std::cout << _about_task << ": " << elapsed_ms << " msec." << std::endl;
        }
    }

private:  
std::chrono::time_point<std::chrono::system_clock> start, end;
bool disp_ = false;
};

使用

TicToc time1;
// your code
time1.toc("process done"); //输出文本和运行时间