The language-defined generic package Containers.Indefinite_Doubly_Linked_Lists
provides private types List and Cursor, and a set of operations for each
type. It provides the same operations as the package Containers.Doubly_Linked_Lists
(see
A.18.3), with the difference that the
generic formal Element_Type is indefinite.
The declaration of
the generic library package Containers.Indefinite_Doubly_Linked_Lists
has the same contents as Containers.Doubly_Linked_Lists except: