timer.h

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// Timer.h
// =======
// High Resolution Timer.
// This timer is able to measure the elapsed time with 1 micro-second accuracy
// in both Windows, Linux and Unix system 
//
//  AUTHOR: Song Ho Ahn (song.ahn@gmail.com)
// CREATED: 2003-01-13
// UPDATED: 2006-01-13
//
// Copyright (c) 2003 Song Ho Ahn




#ifndef TIMER_H_DEF
#define TIMER_H_DEF


#include <iostream>
#include <cstring>
#include <sstream>
#include <cstdlib>
#include <string>

#ifdef WIN32   // Windows system specific
#include <windows.h>
#else          // Unix based system specific
#include <sys/time.h>
#endif



const std::string currentDateTime();


class Timer{
public:
    Timer();
    ~Timer();          

    void   start();
    void   stop(); 
    double getElapsedTime();                   
    double getElapsedTimeInSec();     
    double getElapsedTimeInMilliSec();   
    double getElapsedTimeInMicroSec();        


protected:


private:
    double startTimeInMicroSec; 
    double endTimeInMicroSec;
    int    stopped; 
#ifdef WIN32
    LARGE_INTEGER frequency;                    // ticks per second
    LARGE_INTEGER startCount;                   //
    LARGE_INTEGER endCount;                     //
#else
    timeval startCount;                         //
    timeval endCount;                           //
#endif
};

#endif // TIMER_H_DEF