Is there a way to make enum type to be unsigned? The following code gives me a warning about signed/unsigned comparison.

enum EEE {
    X1 = 1
};

int main()
{
    size_t x = 2;
    EEE t = X1;
    if ( t < x ) std::cout << "ok" << std::endl;

    return 0;
}

I've tried to force compiler to use unsigned underlying type for enum with the following:

enum EEE {
    X1 = 1,
    XN = 18446744073709551615LL
};

But that still gives the warning.