“elaborated type refers to typedef” error when trying to befriend a typedef

Question

Let\'s say I have the following piece of code (a simple CRTP class hierarchy). I want to typedef the base class type to save myself typing (in my actual code, I use the base

Answer 1

You actually can do it in C++ earlier than C++11, but it requires a fairly elaborate (haha) workaround, along the lines of, 1st declare this "helper":

template< class T > struct ParamTypeStruct { typedef T ParamType; };

Then, your friend declaration:

friend class ParamTypeStruct< BaseType >::ParamType;