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A.18.12 The Generic Package Containers.Indefinite_Doubly_Linked_Lists

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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. 

Static Semantics

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The declaration of the generic library package Containers.Indefinite_Doubly_Linked_Lists has the same contents and semantics as Containers.Doubly_Linked_Lists except:
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The generic formal Element_Type is indefinite.
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The procedure with the profile: 
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procedure Insert (Container : in out List;
                  Before    : in     Cursor;
                  Position  :    out Cursor;
                  Count     : in     Count_Type := 1);
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is omitted.
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The actual Element parameter of access subprogram Process of Update_Element may be constrained even if Element_Type is unconstrained.
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The operations Append, Insert, Prepend, and Replace_Element that have a formal parameter of type Element_Type perform indefinite insertion (see A.18). 
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