using System.Collections.Generic;

namespace Encompass
{
    internal class IDManager
    {
        int nextID = 0;

        private Stack<int> availableIDs = new Stack<int>();

        public int NextID()
        {
            if (availableIDs.Count > 0)
            {
                return availableIDs.Pop();
            }
            else
            {
                return nextID++;
            }
        }

        public void Free(int ID)
        {
            availableIDs.Push(ID);
        }
    }
}