Are inner classes in C++ automatically friends?

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After having asked more or less the same question here myself, I wanted to share the (apparently) updated answer for C++11:

Quoted from https://stackoverflow.com/a/14759027/1984137:

standard $11.7.1

“A nested class is a member and as such has the same access rights as
any other member. The members of an enclosing class have no special
access to members of a nested class; the usual access rules shall be
obeyed”

and the usual access rules specify that:

“A member of a class can also access all the names to which the class
has access…”

specific examples has been given in the standard:

class E {
    int x;
    class B { };

    class I {
        B b; // OK: E::I can access E::B
        int y;
        void f(E* p, int i) {
            p->x = i; // OK: E::I can access E::x
        }
    };
}

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