UnityEditor.GameViewSizesMenuItemProvider.CastToGameViewSize C# (CSharp) Method

        private static GameViewSize CastToGameViewSize(object obj)
        {
            GameViewSize size = obj as GameViewSize;
            if (obj == null)
            {
                Debug.LogError("Incorrect input");
                return null;
            }
            return size;
        }

        public int Add(object obj)
        {
            GameViewSize gameViewSize = GameViewSizesMenuItemProvider.CastToGameViewSize(obj);

            if (gameViewSize == null)
            {
                return(-1);
            }
            this.m_GameViewSizeGroup.AddCustomSize(gameViewSize);
            ScriptableSingleton <GameViewSizes> .instance.SaveToHDD();

            return(this.Count() - 1);
        }