Forward declaration of nested types/classes in C++

Question

I recently got stuck in a situation like this:

class A
{
public:
    typedef struct/class {...} B;
...
    C::D *someField;
}

class C
{
public:
    typedef          


        

Answer 1

You can't do it, it's a hole in the C++ language. You'll have to un-nest at least one of the nested classes.