+ /// Substitutes the object by another one and back. So, features wil become exchanged in the list
+ virtual void exchange(const ObjectPtr& theObject1, const ObjectPtr& theObject2) = 0;
+
+ /// Removes the last element in the list.
+ virtual void removeLast() = 0;
+
+ /// Removes the elements from the list.
+ /// \param theIndices a list of indices of elements to be removed
+ virtual void remove(const std::set<int>& theIndices) = 0;
+