Type not found when derived from template base class

Question

I\'m having difficulty understanding why there is a difference in the following two pieces of code, what exactly is the compiler doing.

I have the following bit of t

Answer 1

In the second version, booboo is a dependent name, so it is not automatically visible in the template. You can either add using typename base::booboo; to the derived class, or use your typedef solution, or say typename base::booboo bb = T(1);.