zhy_app_shouhuan/smartcropperlib/opencv/include/opencv2/flann/timer.h

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 *
 * 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.
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#ifndef OPENCV_FLANN_TIMER_H
#define OPENCV_FLANN_TIMER_H

#include <time.h>
#include "opencv2/core.hpp"
#include "opencv2/core/utility.hpp"

namespace cvflann
{

/**
 * A start-stop timer class.
 *
 * Can be used to time portions of code.
 */
class StartStopTimer
{
    int64 startTime;

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


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

    /**
     * Starts the timer.
     */
    void start()
    {
        startTime = cv::getTickCount();
    }

    /**
     * Stops the timer and updates timer value.
     */
    void stop()
    {
        int64 stopTime = cv::getTickCount();
        value += ( (double)stopTime - startTime) / cv::getTickFrequency();
    }

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

};

}

#endif // FLANN_TIMER_H