VC2008 refuses to compile the following code, and I can't understand why.

[oblomino]

template<typename T> class A {
template<typename U> class B;
template<typename U> class C;
template<typename U> class B {
typedef C<U> D;
D *c;
T u;
};
template<typename U> class C { // It works fine if I change 'C' to 'D' here.
typedef B<U> B;
B *b;
T v; //VC2008 complains about this line, that T is undefined.
};
};

A<int> a;

[Codeplug]

Use code tags, so the indentation isn't stripped off.

template<typename T> class A {
    typedef T AT;

    template<typename U> class B;
    template<typename U> class C;

    template<typename U> class B {
        typedef C<U> D;
        D *c;
        typename A::AT u;
    };

    template<typename U> class C { 
        typedef B<U> B;
        B *b;
        typename A::AT v;
    };
};

It's a bug. You can explicitly disambiguate things so the compiler doesn't confuse itself.

gg