Here is a solution for C++ based on operator overloading. It relies on implicit conversion from an `enum` to an `int`.

    #include <iostream>
    
    enum X {};
    bool operator==(X x, int y)
    {
        return true;
    }
    
    int main()
    {
        X x;
        std::cout << std::boolalpha << (x == x+2) << std::endl;
        return 0;
    }