flipcode - Function Pointers To Member Functions

//***************************
// Save the pointer
//***************************

// in_pFunction is of type : void (CClassName::*in_pFunction)() in this example
// The compiler won't let you store the address of a non static function if you
// don't store it in a member variable of the class. But, it will let you use the
// address of the pointer ;-)

// Store the function pointer in a variable
void *pData = *( (void **) &in_pFunction );

// you can now store pData wherever you want since it's a void ptr

//***************************
// Use the pointer
//***************************
// Now that our pointer is safely stored, we have to get it back.
// We can't cast a pointer to a non static member function pointer so we use the
// address of the pointer and change the value it's pointing to :-)

// Declare a variable to store the function pointer.
void (CClassName::*pClassFunction)() = NULL;

// Because we can't cast our void pointer to a member function pointer, store the
// address of the function pointer
void **ppvFunction = ( ( void ** ) &pClassFunction );

// pData contains the pointer stored earlier...
// Since *ppvFunction is the same as pClassFunction we can assign it the value
// that was stored in our void pointer pData
*ppvFunction = pData;

// Call the function a pointer to the class
// If we were to use the pointer directly, the function will be called by creating
// a temporary instance of the call
(this-*pClassFunction)();