opencv/3rdparty/flann/util/timer.h

/***********************************************************************
 * Software License Agreement (BSD License)
 *
 * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
 * Copyright 2008-2009  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
 *
 * THE BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *
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 *************************************************************************/

#ifndef TIMER_H
#define TIMER_H

#include <time.h>


namespace cvflann
{

/**
 * A start-stop timer class.
 *
 * Can be used to time portions of code.
 */
class StartStopTimer
{
    clock_t startTime;

public:
    /**
     * Value of the timer.
     */
    double value;


    /**
     * Constructor.
     */
    StartStopTimer()
    {
        reset();
    }

    /**
     * Starts the timer.
     */
    void start() {
        startTime = clock();
    }

    /**
     * Stops the timer and updates timer value.
     */
    void stop() {
        clock_t stopTime = clock();
        value += ( (double)stopTime - startTime) / CLOCKS_PER_SEC;
    }

    /**
     * Resets the timer value to 0.
     */
    void reset() {
        value = 0;
    }

};

}

#endif // TIMER_H