using System;

​

​

​

/*

​

Allow Person to share the participant role with Company -- both can participate in call

allow participants to be named,

allow Person to share the nextTo role with Furniture,  

allow things that are nextTo other things to have a physical height, and simultaneously

preclude Furniture from being able to participate in a Call. 

*/

​

public class Program

{

    interface IPhysicalThing

    {

        String height

        {

            get;

            set;

        }

​

        IPhysicalThing nextTo 

        {

            get;

            set;

        }

    }

        interface IParticipant

    {

        String name

        {

            get;

            set;

        }

    }

​

    private class PhysicalThing : IPhysicalThing

    {

        public String height

        {

            get;

            set;

        }

        public IPhysicalThing nextTo

        {

            get;

            set;

        }

​

    }

    private class Participant:IParticipant {

        public String name

        {

            get;

            set;

        }

    }

​

    class Person : IPhysicalThing, IParticipant

    {

        private PhysicalThing physical = new PhysicalThing();

        private Participant participant = new Participant();

        public String name

        {

            get { return participant.name; }

            set { participant.name = value; }

        }

        public String height

        {

            get { return physical.height; }

            set { physical.height = value; }

        }

        public IPhysicalThing nextTo

        {

            get { return physical.nextTo; }

            set { physical.nextTo = value; }

        }

    }

​

    class Furniture : IPhysicalThing

    {

        private PhysicalThing physical = new PhysicalThing();

        public String height

        {

            get { return physical.height; }

            set { physical.height = value; }

        }

        public IPhysicalThing nextTo

        {

            get { return physical.nextTo; }

            set { physical.nextTo = value; }

        }

    }

​

    class Company : IParticipant

    {

        private Participant participant = new Participant();

        public override string ToString()

    {

        return "Company(name=" + name + ")";

    }

        public String name

        {

            get { return participant.name; }

            set { participant.name = value; }

        }

    }

​

    static void call(IParticipant p)

    {

        Console.WriteLine("Calling: " + p.name);

    }

​

    public static void Main()

    {

        Company company = new Company() {name = "Facebook"};

        Person person = new Person() {name = "Mark",height="6 feet" };

        Furniture furniture = new Furniture() {nextTo=person, height = "3 meters"};

        // can't do this in the initializer because

        // furniture didn't yet exist.

        person.nextTo = furniture;

        call(company);

        call(person);

        Console.WriteLine(company);

        Console.WriteLine(person);

        Console.WriteLine(furniture);

    // call(furniture);                   // does not compile

    // Console.WriteLine(company.nextTo); // does not compile

    // Console.WriteLine(company.height); // does not compile

    // Console.WriteLine(furniture.name); // does not compile

    // company.height = "6 meters";       // does not compile

    // furniture.name = "Chippendale";    // does not compile

    }

}