What is the fully qualified name of a friend function defined inside of a class?

Question

What is the fully qualified name of a friend function defined inside of a class?

I recently saw an example analogous to the following. What is the fully qualified na

Answer 1

C++ Standard [7.3.1.2/3 (of ISO/IEC 14882:2011)]:

Every name first declared in a namespace is a member of that namespace. If a friend declaration in a non-local class first declares a class or function the friend class or function is a member of the innermost enclosing namespace. The name of the friend is not found by unqualified lookup (3.4.1) or by qualified lookup (3.4.3) until a matching declaration is provided in that namespace scope (either before or after the class definition granting friendship). If a friend function is called, its name may be found by the name lookup that considers functions from namespaces and classes associated with the types of the function arguments (3.4.2). If the name in a friend declaration is neither qualified nor a template-id and the declaration is a function or an elaborated-type-specifier, the lookup to determine whether the entity has been previously declared shall not consider any scopes outside the innermost enclosing namespace.