Problems with pointer-to-members

[Guilherme Müller]

Hi, I'm having a problem with gcc that is making me going nuts!

The compiler is not accepting the code below. I really don't see a light 
at the end of the tunnel, so, please someone help me...

Here is the code:

====================================== CLASS foo
class foo
{
public:
typedef void (foo::*ReadCallback)(char * buffer, unsigned int size);

protected:
void DoAnything(ReadCallback method);
virtual void WhenComplete(char * buffer, unsigned int size);
};


====================================== CLASS foo2

class foo2 : public foo
{
private:
void DoSomething();
};

====================================== foo DECLARATIONS

void foo::DoAnything(ReadCallback method)
{
//do something with the method
}

void foo::WhenComplete(char * buffer, unsigned int size)
{
throw "Please overload this method!!";
}

====================================== foo2 DECLARATIONS

void foo2::foo::WhenComplete(char * buffer, unsigned int size)
{
//do something
};


//Here comes the annoying error

void foo2::DoSomething()
{
ReadCallback callback = WhenComplete;
DoAnything(callback);
}


Here goes the error:
"argument of type ‘void (foo::)(char*, unsigned int)’ does not match 
‘void(foo::*)(char*, unsigned int) "


then, I tryed this:

void foo2::DoSomething()
{
ReadCallback callback = &WhenComplete;
DoAnything(callback);
}

and got this:

"ISO C++ forbids taking the address of an unqualified or parenthesized 
non-static member function to form a pointer to member function. Say 
‘&foo::WhenComplete’"



So, anyone could light my path on this?

Thanks in advance,

Guilherme Müller