import std.stdio;

class Foo
{
    public:
        int a;
        int b;
        override bool opEquals(Object o_other)
        {
            Foo other = cast(Foo) o_other;
            return a == other.a && b == other.b;
        }
};

void main(string[] args)
{
    Foo f = new Foo();
    f.a = 1;
    f.b = 2;
    Foo g = new Foo();
    g.a = 1;
    g.b = 2;
    Foo h = new Foo();
    h.a = 1;
    h.b = 3;
    writefln("f == g: %s", f == g);
    writefln("f == h: %s", f == h);
    writefln("g == h: %s", g == h);
}