public void Smth()
    {
        var list = new List<House>() { new IntsHouse(), new StringsHouse() };
        var visit1 = new DoublerVisitor();
        var visit2 = new VisitorVisitor();

        list.ForEach(x => x.Visit(visit1));

        list.ForEach(x => x.Visit(visit2));
    }

    public interface House
    {
        void Visit(Visitor visit);
    }

    public class IntsHouse : House
    {
        public void Visit(Visitor visit)
        {
            visit.Visit(10);
        }
    }


    public class StringsHouse : House
    {
        public void Visit(Visitor visit)
        {
            visit.Visit("hello");
        }
    }

    public abstract class Visitor
    {
        public abstract void Visit(int someInt);

        public abstract void Visit(string someString);
    }


    public class DoublerVisitor : Visitor
    {
        public override void Visit(int someInt)
        {
            Debug.Log(someInt * 2);
        }

        public override void Visit(string someString)
        {
            Debug.Log(someString + someString);
        }
    }

    public class VisitorVisitor : Visitor
    {
        public override void Visit(int someInt)
        {
            new DoublerVisitor().Visit(someInt);
            Debug.Log(someInt);
        }

        public override void Visit(string someString)
        {
            new DoublerVisitor().Visit(someString);
            Debug.Log(someString);
        }
    }