Is it possible to inject an enum into a classes scope/namespace?

Question

With an enum Foo::Values and a class Bar outside of Foo, can I inject all values of the enum into class scope without redefining the type?

namespace Foo{
    enum Values{
        zero, one, two
    };
}

struct Bar{
    typedef Foo::Values Values; //Doesn't work, but is what I'd like to do
    using Foo::Values;          //Or this
}

So that these are valid:

Foo::Values val = Bar::zero;
assert(std::is_same<Foo::Values, Bar::Values>::value);

Is this possible?

Answer 1

This way:

using Values = Foo::Values;

Extracting the values is possible only one by one:

static constexpr Values zero = Foo::zero;
static constexpr Values one = Foo::one;
static constexpr Values two = Foo::two;

Check:

#include <iostream>
#include <type_traits>

namespace Foo {
    enum Values { zero, one, two };
}

struct Bar {
    using Values = Foo::Values;
    static constexpr Values zero = Foo::zero;
    static constexpr Values one = Foo::one;
    static constexpr Values two = Foo::two;
};

int main() {
    Foo::Values val = Bar::zero;
    std::cout << std::is_same<Foo::Values, Bar::Values>::value;
}

Output:

1