/// <summary>
        /// Create an UndoService.
        /// </summary>
        /// <param name="getState">Method to get the state of the tracked object</param>
        /// <param name="setState">Method to set the state of the tracked object</param>
        /// <param name="cap">Capacity of Undo history</param>
        public UndoService(GetState <T> getState, SetState <T> setState, int?cap = null)
        {
            GetState = getState ?? throw new ArgumentNullException(nameof(getState));
            SetState = setState ?? throw new ArgumentNullException(nameof(setState));
            var stackFactory = new StackFactory <StateRecord <T> >();

            _undoStack = stackFactory.MakeStack(cap);
            // T currentState;
            GetState(out T currentState);
            _originalState = currentState;
            _currentState  = new StateRecord <T> {
                State = currentState
            };
            _redoStack                  = new StandardStack <StateRecord <T> >();
            _undoServiceValidator       = new UndoServiceValidator <StateRecord <T> >(_undoStack, _redoStack);
            _undoStack.HasItemsChanged += UndoStack_HasItemsChanged;
            _redoStack.HasItemsChanged += RedoStack_HasItemsChanged;
        }
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        /// <summary>
        /// Creates an aggregate of UndoServices.
        /// </summary>
        /// <param name="subUndoServices"></param>
        public UndoServiceAggregate(IUndoService[] subUndoServices)
        {
            _undoStack                  = new IntStackWithDelete();
            _redoStack                  = new IntStackWithDelete();
            _subUndoServices            = new List <SubUndoService>();
            _clearStackInvocationsCount = 0;

            if (subUndoServices == null)
            {
                throw new ArgumentNullException(nameof(subUndoServices));
            }

            for (var i = 0; i < subUndoServices.Length; i++)
            {
                AddUndoService(subUndoServices[i]);
            }

            _undoServiceValidator       = new UndoServiceValidator <int>(_undoStack, _redoStack);
            _undoStack.HasItemsChanged += UndoStack_HasItemsChanged;
            _redoStack.HasItemsChanged += RedoStack_HasItemsChanged;
        }