c++ typedef another class's enum?

Question

So here's my problem:

struct A
{
    enum A_enum
    {
        E0,
        E1,
        E2
    };
};

struct B
{
    typedef A::A_enum B_enum;
    bool test(B_enum val)
    {
        return (val == E1); // error: "E1" undeclared identifier
    }
};

I specifically do not want to say A::E1. If I try B_enum::E1 I receive a warning that it is nonstandard. Is there a good way to do something like this?

Answer 1

I reckon that A should be a namespace instead of a struct.