using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var weaponList = new ContinuousList<Weapon>();

        weaponList.Add(new Sword()); 

        weaponList.Add(new Axe());

        Console.WriteLine(weaponList.Current);// gets Sword

        weaponList.MoveNext();

        Console.WriteLine(weaponList.Current);// gets Sword Axe

        weaponList.MoveNext();

        Console.WriteLine(weaponList.Current);// Backt to Sword

    }

}

​

public class Weapon{}

​

public class Sword: Weapon{}

public class Axe: Weapon{}

​

public class ContinuousList<T>

{

    private List<T> internalList = new List<T>();

    private int currentIndex = 0;

​

    public void Add(T item) => internalList.Add(item);

​

    public T Current {get => internalList[currentIndex];}

​

    public void MoveNext()

    {

       currentIndex++;

       if(currentIndex >= internalList.Count) currentIndex = 0;

    }

​

    public void MovePrevious()

    {

       currentIndex--;

       if(currentIndex <= 0) currentIndex = internalList.Count - 1;

    }

}

​

​