Question

I’ve a pointer function in a class that is defined outside the class and used as a callback.

The class goes like this

class A
{
    void CreateGrid(OWindow *win,int x,int y);
    Otkobject *GetIcon(void *data,Otkobject *obj,int x)
}

I’ve defined the GetIcon function like this

Otkobject *A::GetIcon(oid *data,Otkobject *obj,int x){
    //statements
}

For this I’m getting errors.

Then I tried

Otkobject A::*GetIcon(void *data,Otkobject *obj,int x){
    //statements
}

I’m getting function name and use callback. How to use this function pointer?

Answer 1

That’s a function returning a pointer, not a function pointer. The error might be the missing semicolon after the class declaration:

class A
{
    void CreateGrid(OWindow *win,int x,int y);
    Otkobject *GetIcon(void *data,Otkobject *obj,int x); // <- also here
}; // <- notice semicolon