Posted By

browny on 09/03/10

Tagged

Versions (?)

Last Edited at 09/03/10 03:30pm

Statistics

Viewed 494 times

Favorited by 0 user(s)

Related snippets

High accuracy program timer

/ Published in: C++

Highlighted TextExpand

// How to use

CStopWatch s;
s.startTimer();

// put the code which you want to measure here //

s.stopTimer();
double mtime = s.getElapsedTime() * 1000;

// hr_time.h
 #include <windows.h>
 
 typedef struct {
     LARGE_INTEGER start;
     LARGE_INTEGER stop;
 } stopWatch;
 
 class CStopWatch {
 
 private:
     stopWatch timer;
     LARGE_INTEGER frequency;
     double LIToSecs( LARGE_INTEGER & L) ;
 public:
     CStopWatch() ;
     void startTimer( ) ;
     void stopTimer( ) ;
     double getElapsedTime() ;
 };

// hr_time.cpp
#include <windows.h>
 
 #ifndef hr_timer
 #include "hr_time.h"
 #define hr_timer
 #endif
 
 double CStopWatch::LIToSecs( LARGE_INTEGER & L) {
     return ((double)L.QuadPart /(double)frequency.QuadPart) ;
 }
 
 CStopWatch::CStopWatch(){
     timer.start.QuadPart=0;
     timer.stop.QuadPart=0; 
     QueryPerformanceFrequency( &frequency ) ;
 }
 
 void CStopWatch::startTimer( ) {
     QueryPerformanceCounter(&timer.start) ;
 }
 
 void CStopWatch::stopTimer( ) {
     QueryPerformanceCounter(&timer.stop) ;
 }
 
 double CStopWatch::getElapsedTime() {
     LARGE_INTEGER time;
     time.QuadPart = timer.stop.QuadPart - timer.start.QuadPart;
     return LIToSecs( time) ;
 }

URL: http://cplus.about.com/od/howtodothingsi2/a/timing.htm

Report this snippet Tweet

Comments

Subscribe to comments

Comment:

You need to login to post a comment.