The language-defined generic package Containers.Indefinite_Ordered_Sets
provides a set with the same operations as the package Containers.Ordered_Sets
(see
A.18.9), with the difference that the
generic formal type Element_Type is indefinite.
The declaration of
the generic library package Containers.Indefinite_Ordered_Sets
has the same contents as Containers.Ordered_Sets except:
The generic formal Element_Type is indefinite.
The actual Element parameter of access subprogram
Process of Update_Element_Preserving_Key may be constrained even if Element_Type
is unconstrained.