I have a simple C++ class.  I want to pass one member function of the
class the address of another member function of the same class and
then call that passed function.  I know this is doable if a static
function is passed as the function to be called.  I need the function
to be called to be non-static.  I am wondering if there is a way to
convince the compiler to not only pass the address of a non-static
member function but to call it as well.  I have some sample code below
and I get a compile error where indicated:

class A;
typedef void (*(A::func))(int i); 
// also does not work if "typedef void (*func)(int i);"


class A
{
public:
	void a( func f )
	{
		f( 123 );
		printf( "A::a\n" ); 
	}
	void b()
	{
		printf( "A::b\n" );
		a( c );   ////<<<<< COMPILE ERROR HERE
	}
	void c(int i)
	{
		printf( "A::c, i=%d\n", i ); 
	}
};

The answer "It is not possible and here's the documented reason why"
is acceptable too...

---

Request for Question Clarification by maniac-ga on 04 Aug 2004 18:39 PDT

Hello Mtb_man,

Just to let you know that Chinchilla is:
 - not a Google Answers researcher
 - gave you the answer for no fee (as a comment)
 - and cannot answer the question

If you are satisfied with the comment, I suggest you simply close the
question to prevent you getting charged for a further answer. If not,
responde to the request for question clarification so one of us can
answer your question more fully.

  --Maniac

for member functions you use a slightly different syntax than for class methods.
instead of 
  typedef void (*(A::func))(int i);
use
  typedef void ((A::*func))(int i);
since you want to have a pointer to a member function,

to use it (in method a), do this by
  (this->*f) (123);
the `this' pointer is necessary, since the compiler does not assume a
`this' by default, as for normal
method calls.

Also you have to call a (in method b) by
  a(&A::c);
since the method itself (c) is still located in the class, not in the object.

Awesome answer - I was close but would have never figured out the
correct syntax.  Can you possibly point me to where this would be
documented inline or in a popular C++ book?  Also, please post your
comment as an answer so I can pay you - you earned the money!!!