Re: Forward declarations, templates, and typedefs

You can't forward-declare a typedef because it is just an alias for
some other type, not a type itself. You can forward declare a class
template as such:

 template<class T> class SomeClassTemplate;

But, to forward declare a class template with default parameters, you
have to specify them in the forward declaration:

 template<ENUM X, int I = 0> class Generic;

Then you can include perhaps just your typedefs. You'll end up with
something like this:

 enum ENUM { A, B };

 template<ENUM X, int I = 0> class Generic;

 typedef Generic<A> SomeTypeA;
 typedef Generic<B> SomeTypeB;
 typedef Generic<A,1> SomeTypeBad;

 SomeTypeA* pa = 0;
 SomeTypeB* pb = 0;
 SomeTypeBad* pbad = 0;

 template<ENUM X, int I = 0> class Generic
 {
 public:
     enum { val = I };
     ENUM foo() const { return X; }
 };