Time.cpp
//////////////////////////////////////////////////////////////////////////////
// Timer.cpp
// =========
// 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
//////////////////////////////////////////////////////////////////////////////#include "Timer.h"
#include <stdlib.h>///////////////////////////////////////////////////////////////////////////////
// constructor
///////////////////////////////////////////////////////////////////////////////
Timer::Timer()
{
#ifdef WIN32
QueryPerformanceFrequency(&frequency);
startCount.QuadPart = 0;
endCount.QuadPart = 0;
#else
startCount.tv_sec = startCount.tv_usec = 0;
endCount.tv_sec = endCount.tv_usec = 0;
#endif stopped = 0;
startTimeInMicroSec = 0;
endTimeInMicroSec = 0;
}///////////////////////////////////////////////////////////////////////////////
// distructor
///////////////////////////////////////////////////////////////////////////////
Timer::~Timer()
{
}///////////////////////////////////////////////////////////////////////////////
// start timer.
// startCount will be set at this point.
///////////////////////////////////////////////////////////////////////////////
void Timer::start()
{
stopped = 0; // reset stop flag
#ifdef WIN32
QueryPerformanceCounter(&startCount);
#else
gettimeofday(&startCount, NULL);
#endif
}///////////////////////////////////////////////////////////////////////////////
// stop the timer.
// endCount will be set at this point.
///////////////////////////////////////////////////////////////////////////////
void Timer::stop()
{
stopped = 1; // set timer stopped flag#ifdef WIN32
QueryPerformanceCounter(&endCount);
#else
gettimeofday(&endCount, NULL);
#endif
}///////////////////////////////////////////////////////////////////////////////
// compute elapsed time in micro-second resolution.
// other getElapsedTime will call this first, then convert to correspond resolution.
///////////////////////////////////////////////////////////////////////////////
double Timer::getElapsedTimeInMicroSec()
{
#ifdef WIN32
if(!stopped)
QueryPerformanceCounter(&endCount); startTimeInMicroSec = startCount.QuadPart * (1000000.0 / frequency.QuadPart);
endTimeInMicroSec = endCount.QuadPart * (1000000.0 / frequency.QuadPart);
#else
if(!stopped)
gettimeofday(&endCount, NULL); startTimeInMicroSec = (startCount.tv_sec * 1000000.0) + startCount.tv_usec;
endTimeInMicroSec = (endCount.tv_sec * 1000000.0) + endCount.tv_usec;
#endif return endTimeInMicroSec - startTimeInMicroSec;
}///////////////////////////////////////////////////////////////////////////////
// divide elapsedTimeInMicroSec by 1000
///////////////////////////////////////////////////////////////////////////////
double Timer::getElapsedTimeInMilliSec()
{
return this->getElapsedTimeInMicroSec() * 0.001;
}///////////////////////////////////////////////////////////////////////////////
// divide elapsedTimeInMicroSec by 1000000
///////////////////////////////////////////////////////////////////////////////
double Timer::getElapsedTimeInSec()
{
return this->getElapsedTimeInMicroSec() * 0.000001;
}///////////////////////////////////////////////////////////////////////////////
// same as getElapsedTimeInSec()
///////////////////////////////////////////////////////////////////////////////
double Timer::getElapsedTime()
{
return this->getElapsedTimeInSec();
}
//////////////////////////////////////////////////////////////////////////////
// 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#ifdef WIN32 // Windows system specific
#include <windows.h>
#else // Unix based system specific
#include <sys/time.h>
#endifclass Timer
{
public:
Timer(); // default constructor
~Timer(); // default destructor void start(); // start timer
void stop(); // stop the timer
double getElapsedTime(); // get elapsed time in second
double getElapsedTimeInSec(); // get elapsed time in second (same as getElapsedTime)
double getElapsedTimeInMilliSec(); // get elapsed time in milli-second
double getElapsedTimeInMicroSec(); // get elapsed time in micro-secondprotected:private:
double startTimeInMicroSec; // starting time in micro-second
double endTimeInMicroSec; // ending time in micro-second
int stopped; // stop flag
#ifdef WIN32
LARGE_INTEGER frequency; // ticks per second
LARGE_INTEGER startCount; //
LARGE_INTEGER endCount; //
#else
timeval startCount; //
timeval endCount; //
#endif
};#endif // TIMER_H_DEF
调用方式:
#include "Timer.h"
Timer timer; // timer
double elapsedTime; // time in millisecond
double avgtime = ;
double testnum = ;
void timebegin()
{
timer.start();
}void timeend(string str)
{
elapsedTime = timer.getElapsedTimeInMilliSec();
avgtime += elapsedTime;
str = str + "time is: ";// %lf ms\n";
cout << str << elapsedTime << "ms" << endl;
}