pointers to class functions?

btq · 08-19-2002

errhh...
is it possible to make a pointer that can contain a pointer to function inside a class not yet defined?
like:

Code:

struct Linked{
    void (*pt2member)();
    Linked *next;
}

class MyClass{
     Linked *root;
     void myFunct();
     MyClass();
}

MyClass::MyClass()
{
     root = new Linked;
     root->pt2member=(*this.*myFunct)();
}

obviously the above don't work and I kinda assume you can't get this to work this way. I guess you get the pictuer: for it to work I have to set the void (*pt2member)(); to void (myClass::*pt2member)(); but (I suspect) since myClass isn't defined before the Linked...yeah well.
I just want to be assured this style doesn't work before moving on...
but then again maybe it can work...?)

I guess the question really is: do you have to declare the pointer to a class's function to be a pointer to the functions of that class
or can you just use a regular functionpointer somehow?
like: void (*funct)(); can't point to a class's member function?
thanks a bunnnchhhhhh
/btq

**no-one** · 08-19-2002

try this

::edit:: Added comments

Code:

// prototype/declare the class?
class MyClass;

// typedef a function pointer to a member of MyClass taking no arguements and returning void
typedef void (MyClass::*Fptr)(void);

struct Linked{
// this is the function pointer call like "pt2member();"
    Fptr pt2member;
    Linked *next;
};

class MyClass{
	MyClass();
    Linked *root;
// the function to be pointed to
    void myFunct(void); 
};

MyClass::MyClass()
{
     root = new Linked;
// when assining a function to a function pointer leave of the ()
     root->pt2member= this->myFunct;
}

void MyClass::myFunct(void)
{

}

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