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30 
31 #ifndef OPENCV_FLANN_TIMER_H
32 #define OPENCV_FLANN_TIMER_H
33 
34 #include <time.h>
35 #include "opencv2/core.hpp"
36 #include "opencv2/core/utility.hpp"
37 
38 namespace cvflann
39 {
40 
41 /**
42  * A start-stop timer class.
43  *
44  * Can be used to time portions of code.
45  */
46 class StartStopTimer
47 {
48     int64 startTime;
49 
50 public:
51     /**
52      * Value of the timer.
53      */
54     double value;
55 
56 
57     /**
58      * Constructor.
59      */
StartStopTimer()60     StartStopTimer()
61     {
62         reset();
63     }
64 
65     /**
66      * Starts the timer.
67      */
start()68     void start()
69     {
70         startTime = cv::getTickCount();
71     }
72 
73     /**
74      * Stops the timer and updates timer value.
75      */
stop()76     void stop()
77     {
78         int64 stopTime = cv::getTickCount();
79         value += ( (double)stopTime - startTime) / cv::getTickFrequency();
80     }
81 
82     /**
83      * Resets the timer value to 0.
84      */
reset()85     void reset()
86     {
87         value = 0;
88     }
89 
90 };
91 
92 }
93 
94 #endif // FLANN_TIMER_H
95