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-- File: PCollection_HDoubleList.cdl
-- Created: Wed Feb 19 14:24:56 1992
-- Author: Jean Pierre TIRAULT
-- <jpt@topsn1>
---Copyright: Matra Datavision 1992
generic class HDoubleList from PCollection (Item as Storable)
inherits PManaged
raises NoSuchObject from Standard
is
---Purpose: Definition of a double linked list
-- Idem to the SingleList with a pointer to the previous node
Create returns mutable HDoubleList;
---Purpose: Creation of an empty list
IsEmpty(me) returns Boolean;
---Level: Public
---Purpose: Returns True if the list contains no element.
Construct(me : mutable; T : Item) returns mutable HDoubleList;
---Level: Public
---Purpose: Adds T at the begining of me.
---Example: before
-- me = (A B C)
-- after
-- me = (A B C)
-- returns
-- (T A B C)
Value(me) returns any Item
raises NoSuchObject;
---Level: Public
---Purpose: Value of the first node of me
-- Raises an exception if me is empty
---Purpose: before
-- me = (A B C)
-- after
-- me = (A B C)
-- returns
-- A
Tail(me) returns any HDoubleList
raises NoSuchObject;
---Level: Public
---Purpose: Returns the end of the list <me>.
-- Raises an exception if me is empty.
---Example: before
-- me = (A B C)
-- after
-- me = (A B C)
-- returns
-- (B C)
Previous(me) returns any HDoubleList
raises NoSuchObject;
---Level: Public
---Purpose: Previous node of me.
-- Raises an exception if me is empty.
---Example: before
-- A list L = (A B C) with me = (B C) a sub-list of L.
-- after
-- L = (A B C), me = (B C)
-- returns
-- (A)
SwapTail(me : mutable; WithList : in out any HDoubleList)
raises NoSuchObject;
---Level: Public
---Purpose: Exchanges end of me with WithList.
-- Raises an exception if me is empty.
---Example: before
-- me = (A B C)
-- WithList = (D E)
-- after
-- me = (A D E)
-- WithList = (B C)
SetValue(me : mutable; T : Item)
raises NoSuchObject;
---Level: Public
---Purpose: Changes the value of the first node of me.
-- Raises an exception if me is empty.
---Example: before
-- me = (A B C)
-- after
-- me = (T B C)
ChangeBackPointer(me : mutable; BackPointer : HDoubleList);
---Level: Public
---Purpose: Modification of the backward pointer
ChangeForwardPointer(me : mutable; ForwardPointer :
HDoubleList);
---Level: Public
---Purpose: Modification of the forward pointer
ShallowCopy(me)
returns mutable like me
is redefined;
---Level: Advanced
---C++: function call
ShallowDump (me; s: in out OStream)
is redefined;
---Level: Advanced
---C++: function call
Destroy(me : mutable);
---C++: alias ~
fields
Data : Item;
Next : HDoubleList;
Before : HDoubleList;
end HDoubleList;
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