Ambiguity in friend function declarations?

[Serge Pavlov]

If a function declared in global namespace returns value of class or enum type, there is apparent ambiguity if this function is declared as a friend of some class defined in a namespace. See example:

class A {};

A func();

namespace N {

  class C {

    friend A :: func();

  };

}

gcc, cland and icc all reject the friend function declaration, because the try to interpret 'A::' as a nested name specifier. It would however be a valid code if '::' were treated as a global scope specifier in function declarator.

The question is inspired by clang problem report https://llvm.org/bugs/show_bug.cgi?id=28422, which considers the case of enum, but the problem is the same.

Is there anything in the Standard that prescribes such interpretation?

[Richard Smith]

See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1828 

[Serge Pavlov]

It is exactly what I need.

Thank you very much!

--Serge

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