/// <summary>
/// Execute all pending operations for the given index.
/// </summary>
/// <param name = "index">The index for which to execute the pending operations.</param>
void DoPendingOperations(int index)
{
if (index < 0 || index > Count)
{
throw new ArgumentException("The specified index lies outside of the available range.", nameof(index));
}
List <Func <TObject, TObject> > operations = _pendingOperations.ElementsAt(index);
ExecuteOperations(operations, index);
// Remove operations as they are no longer pending.
_pendingOperations.RemoveInterval(new Interval <int>(index, index));
}