“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

Enable C++11 only and use friend BaseType

You cannot use friend class on typedef in C++03.

An elaborated-type-specifier shall be used in a friend declaration for a class(101)

101) The class-key of the elaborated-type-specifier is required.

elaborated-type-specifier:

class-key ::opt nested-name-specifieropt identifier

class-key ::opt nested-name-specifieropt templateopt template-id

enum ::opt nested-name-specifieropt identifier

typename ::opt nested-name-specifier identifier

typename ::opt nested-name-specifier templateopt template-id