HKIVar.cs

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using UnityEngine;
using System.Xml;

namespace HKI.Core.Variables
{
    [System.Serializable]
    public abstract class HKIVar : ScriptableObject, ISaveAndLoadable
    {
        // Public varaiables
        public event System.Action OnValueChanged;

        // Interface functions
        public abstract void Save(XmlNode parentNode);
        public abstract void Load(XmlNode node);

        // Protected helper functions
        protected void RaiseOnValueChangedCallback()
        {
            if(OnValueChanged != null)
                OnValueChanged.Invoke();
        }
    }
}