c++ - Having trouble creating a class based implementation of OpenCV's mouseCallback function -

as title suggest, i'm having trouble implementing opencv's mousecallback function in class based c++ structure. allow me explain. have defined class called briskmatching in have created member function named mousecallback correct parameters opencv requires (please see code snippet below).

**briskmatching.h**  class briskmatching { public:     briskmatching();     ~briskmatching();  public:     void mousecallback(int event, int x, int y, int flags, void *param); }; 

this fine, problem arises when try set function designated mouse callback function through opencv's cv::setmousecallback function.

in main function, create instance of briskmatching class called briskmatcher when comes time set mouse callback attempt so...

cv::setmousecallback("matches", briskmatching::mousecallback, &matchesimg); 

unfortunately, throws error.

error   3   error c3867: 'briskmatching::mousecallback': function call missing argument list; use '&briskmatching::mousecallback' create pointer member c:\users\mobilef\documents\visual studio 2010\projects\opencv_objtracking\opencv_briskmatching\main.cpp 54  1   opencv_briskmatching 

i rid of error declaring mousecallback function static in briskmatching.h whole whack of other errors since refer many non-static member variables in mousecallback function.

so question guys this. how should modify code able pass mousecallback function declared within briskmatching class cv::setmousecallback function?

thanks in advanced!

since member function takes this pointer, need static wrapper function. typically, use param parameter address of object member function belongs to, end this:

... static void mousecallback(int event, int x, int y, int flags, void *param);  void domousecallback(int event, int x, int y, int flags); 

and inside mousecallback:

void briskmatching::mousecallback(int event, int x, int y, int flags, void *param) {     briskmatching *self = static_cast<briskmatching*>(param);     self->domousecallback(event, x, y, flags); }