OpBinaryRight

class Foo{
    int _j;
    int opBinary(string op)(int i) if(op == "+"){
        return i+_j;
    }
    int opBinaryRight(string op)(int i) if(op == "+"){
        return i+_j;
    }
}

class_wrap!(Foo,
    OpBinary!("+"),
    OpBinaryRight!("+"));