riversong-code-showcase/Source/Riversong/Game/CommonServices/Entities/IEntityCollectionCallbacks.cs

using System;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public interface IEntityCollectionCallbacks
    {
        public void OnAdded(Entity entity);

        public void OnRemoved(Entity entity);
    }

    public interface IEntityCollectionCallbacks<out T> : IEntityCollectionCallbacks
    {
        event Action<T> Added;

        event Action<T> Removed;
    }
}