C++ Inherited template classes don't have access to the base class [duplicate]

Answer 1

You need to help the compiler out by using this->x and this->y.

http://www.parashift.com/c++-faq/templates.html#faq-35.19

Answer 2

You must explicitly refer to parent:

template <typename T>
struct xVector2 : xPoint2<T>
{
    typedef xPoint2<T> B;
    xVector2() { B::x = 0; B::y = 0; };
};