idle-survivors/Assets/Scripts/RuntimeSet/RuntimeSetSO.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace RuntimeSet
{
    public abstract class RuntimeSetSO<T> : ScriptableObject, IEnumerable<T>
    {
        [HideInInspector] [SerializeField] private List<T> items = new();
    
        protected IReadOnlyCollection<T> Items => items;
        public bool IsEmpty => items.Count == 0;
        public int Count => items.Count;
    
        public void Add(T item)
        {
            if (!items.Contains(item))
            {
                items.Add(item);
            }
        }
    
        public void Remove(T item)
        {
            if (items.Contains(item))
            {
                items.Remove(item);
            }
        }

        public IEnumerator<T> GetEnumerator()
        {
            return items.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
    }
}