C++ Template: 'is not derived from type'

Question

Why is this code not valid?

#include 

template 
class A {
  public:
    A() { v.clear(); }

    std::vector *&         


        

Answer 1

You need to add typename as the types depend on each other and the compiler can't figure out if it really is a type.

However, on gcc 4.5.0 i get a more concise error message:

test.cc:8:3: error: need ‘typename’ before ‘std::vector*>::const_iterator’ because ‘std::vector*>’ is a dependent scope