namespace WindowsFormsApp1.OP
{
    public interface ISubject<T>
    {
        /// <summary>
        /// Attach an observer to the object.
        /// </summary>
        /// <param name="observer">Your Observer.</param>
        void Subscribe(IObserver<T> observer);
        /// <summary>
        /// Detach an observer from an object.
        /// </summary>
        /// <param name="observer">Your observer.</param>
        void Unsubscribe(IObserver<T> observer);
        /// <summary>
        /// Notify all observers about an event.
        /// </summary>
        void Notify();

        void SetState(T state);
        T GetState();
    }
}