A.18.11 The Generic Package Containers.Indefinite_Vectors
The language-defined generic package Containers.Indefinite_Vectors 
provides a private type Vector and a set of operations. It provides the 
same operations as the package Containers.Vectors (see 
A.18.2), 
with the difference that the generic formal Element_Type is indefinite. 
 
Static Semantics
The declaration of 
the generic library package Containers.Indefinite_Vectors
 
has the same contents and semantics as Containers.Vectors except:
 
The generic formal Element_Type is indefinite.
The procedures with 
the profiles: 
procedure Insert (Container : in out Vector;
                  Before    : in     Extended_Index;
                  Count     : in     Count_Type := 1);
procedure Insert (Container : in out Vector;
                  Before    : in     Cursor;
                  Position  :    out Cursor;
                  Count     : in     Count_Type := 1);
are omitted.
The actual Element parameter of access subprogram 
Process of Update_Element may be constrained even if Element_Type is 
unconstrained.
The operations "&", Append, Insert, 
Prepend, Replace_Element, and To_Vector that have a formal parameter 
of type Element_Type perform indefinite insertion (see 
A.18). 
 
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