timer.h

00001 /***********************************************************************
00002  * Software License Agreement (BSD License)
00003  *
00004  * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
00005  * Copyright 2008-2009  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
00006  *
00007  * THE BSD LICENSE
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00009  * Redistribution and use in source and binary forms, with or without
00010  * modification, are permitted provided that the following conditions
00011  * are met:
00012  *
00013  * 1. Redistributions of source code must retain the above copyright
00014  *    notice, this list of conditions and the following disclaimer.
00015  * 2. Redistributions in binary form must reproduce the above copyright
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00019  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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00030 
00031 #ifndef OPENCV_FLANN_TIMER_H
00032 #define OPENCV_FLANN_TIMER_H
00033 
00034 #include <time.h>
00035 #include "opencv2/core.hpp"
00036 #include "opencv2/core/utility.hpp"
00037 
00038 namespace cvflann
00039 {
00040 
00041 /**
00042  * A start-stop timer class.
00043  *
00044  * Can be used to time portions of code.
00045  */
00046 class StartStopTimer
00047 {
00048     int64 startTime;
00049 
00050 public:
00051     /**
00052      * Value of the timer.
00053      */
00054     double value;
00055 
00056 
00057     /**
00058      * Constructor.
00059      */
00060     StartStopTimer()
00061     {
00062         reset();
00063     }
00064 
00065     /**
00066      * Starts the timer.
00067      */
00068     void start()
00069     {
00070         startTime = cv::getTickCount();
00071     }
00072 
00073     /**
00074      * Stops the timer and updates timer value.
00075      */
00076     void stop()
00077     {
00078         int64 stopTime = cv::getTickCount();
00079         value += ( (double)stopTime - startTime) / cv::getTickFrequency();
00080     }
00081 
00082     /**
00083      * Resets the timer value to 0.
00084      */
00085     void reset()
00086     {
00087         value = 0;
00088     }
00089 
00090 };
00091 
00092 }
00093 
00094 #endif // FLANN_TIMER_H
00095