1504 lines
36 KiB
Ada
1504 lines
36 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT LIBRARY COMPONENTS --
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-- --
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-- ADA.CONTAINERS.RESTRICTED_DOUBLY_LINKED_LISTS --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2004-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- This unit was originally developed by Matthew J Heaney. --
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------------------------------------------------------------------------------
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with System; use type System.Address;
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package body Ada.Containers.Restricted_Doubly_Linked_Lists is
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure Allocate
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(Container : in out List'Class;
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New_Item : Element_Type;
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New_Node : out Count_Type);
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procedure Free
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(Container : in out List'Class;
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X : Count_Type);
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procedure Insert_Internal
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(Container : in out List'Class;
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Before : Count_Type;
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New_Node : Count_Type);
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function Vet (Position : Cursor) return Boolean;
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---------
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-- "=" --
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---------
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function "=" (Left, Right : List) return Boolean is
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LN : Node_Array renames Left.Nodes;
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RN : Node_Array renames Right.Nodes;
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LI : Count_Type := Left.First;
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RI : Count_Type := Right.First;
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begin
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if Left'Address = Right'Address then
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return True;
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end if;
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if Left.Length /= Right.Length then
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return False;
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end if;
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for J in 1 .. Left.Length loop
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if LN (LI).Element /= RN (RI).Element then
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return False;
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end if;
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LI := LN (LI).Next;
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RI := RN (RI).Next;
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end loop;
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return True;
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end "=";
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--------------
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-- Allocate --
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--------------
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procedure Allocate
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(Container : in out List'Class;
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New_Item : Element_Type;
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New_Node : out Count_Type)
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is
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N : Node_Array renames Container.Nodes;
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begin
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if Container.Free >= 0 then
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New_Node := Container.Free;
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N (New_Node).Element := New_Item;
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Container.Free := N (New_Node).Next;
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else
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New_Node := abs Container.Free;
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N (New_Node).Element := New_Item;
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Container.Free := Container.Free - 1;
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end if;
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end Allocate;
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------------
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-- Append --
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------------
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procedure Append
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(Container : in out List;
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New_Item : Element_Type;
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Count : Count_Type := 1)
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is
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begin
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Insert (Container, No_Element, New_Item, Count);
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end Append;
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------------
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-- Assign --
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------------
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procedure Assign (Target : in out List; Source : List) is
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begin
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if Target'Address = Source'Address then
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return;
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end if;
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if Target.Capacity < Source.Length then
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raise Constraint_Error; -- ???
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end if;
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Clear (Target);
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declare
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N : Node_Array renames Source.Nodes;
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J : Count_Type := Source.First;
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begin
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while J /= 0 loop
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Append (Target, N (J).Element);
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J := N (J).Next;
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end loop;
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end;
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end Assign;
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-----------
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-- Clear --
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-----------
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procedure Clear (Container : in out List) is
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N : Node_Array renames Container.Nodes;
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X : Count_Type;
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begin
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if Container.Length = 0 then
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pragma Assert (Container.First = 0);
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pragma Assert (Container.Last = 0);
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-- pragma Assert (Container.Busy = 0);
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-- pragma Assert (Container.Lock = 0);
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return;
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end if;
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pragma Assert (Container.First >= 1);
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pragma Assert (Container.Last >= 1);
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pragma Assert (N (Container.First).Prev = 0);
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pragma Assert (N (Container.Last).Next = 0);
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-- if Container.Busy > 0 then
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-- raise Program_Error;
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-- end if;
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while Container.Length > 1 loop
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X := Container.First;
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Container.First := N (X).Next;
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N (Container.First).Prev := 0;
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Container.Length := Container.Length - 1;
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Free (Container, X);
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end loop;
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X := Container.First;
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Container.First := 0;
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Container.Last := 0;
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Container.Length := 0;
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Free (Container, X);
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end Clear;
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--------------
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-- Contains --
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--------------
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function Contains
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(Container : List;
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Item : Element_Type) return Boolean
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is
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begin
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return Find (Container, Item) /= No_Element;
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end Contains;
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------------
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-- Delete --
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------------
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procedure Delete
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(Container : in out List;
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Position : in out Cursor;
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Count : Count_Type := 1)
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is
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N : Node_Array renames Container.Nodes;
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X : Count_Type;
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begin
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if Position.Node = 0 then
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raise Constraint_Error;
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end if;
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if Position.Container /= Container'Unrestricted_Access then
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raise Program_Error;
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end if;
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pragma Assert (Vet (Position), "bad cursor in Delete");
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if Position.Node = Container.First then
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Delete_First (Container, Count);
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Position := No_Element;
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return;
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end if;
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if Count = 0 then
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Position := No_Element;
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return;
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end if;
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-- if Container.Busy > 0 then
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-- raise Program_Error;
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-- end if;
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pragma Assert (Container.First >= 1);
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pragma Assert (Container.Last >= 1);
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pragma Assert (N (Container.First).Prev = 0);
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pragma Assert (N (Container.Last).Next = 0);
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for Index in 1 .. Count loop
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pragma Assert (Container.Length >= 2);
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X := Position.Node;
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Container.Length := Container.Length - 1;
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if X = Container.Last then
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Position := No_Element;
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Container.Last := N (X).Prev;
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N (Container.Last).Next := 0;
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Free (Container, X);
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return;
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end if;
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Position.Node := N (X).Next;
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N (N (X).Next).Prev := N (X).Prev;
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N (N (X).Prev).Next := N (X).Next;
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Free (Container, X);
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end loop;
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Position := No_Element;
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end Delete;
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------------------
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-- Delete_First --
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------------------
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procedure Delete_First
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(Container : in out List;
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Count : Count_Type := 1)
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is
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N : Node_Array renames Container.Nodes;
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X : Count_Type;
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begin
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if Count >= Container.Length then
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Clear (Container);
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return;
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end if;
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if Count = 0 then
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return;
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end if;
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-- if Container.Busy > 0 then
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-- raise Program_Error;
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-- end if;
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for I in 1 .. Count loop
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X := Container.First;
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pragma Assert (N (N (X).Next).Prev = Container.First);
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Container.First := N (X).Next;
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N (Container.First).Prev := 0;
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Container.Length := Container.Length - 1;
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Free (Container, X);
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end loop;
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end Delete_First;
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-----------------
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-- Delete_Last --
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-----------------
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procedure Delete_Last
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(Container : in out List;
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Count : Count_Type := 1)
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is
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N : Node_Array renames Container.Nodes;
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X : Count_Type;
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begin
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if Count >= Container.Length then
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Clear (Container);
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return;
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end if;
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if Count = 0 then
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return;
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end if;
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-- if Container.Busy > 0 then
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-- raise Program_Error;
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-- end if;
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for I in 1 .. Count loop
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X := Container.Last;
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pragma Assert (N (N (X).Prev).Next = Container.Last);
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Container.Last := N (X).Prev;
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N (Container.Last).Next := 0;
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Container.Length := Container.Length - 1;
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Free (Container, X);
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end loop;
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end Delete_Last;
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-------------
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-- Element --
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-------------
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function Element (Position : Cursor) return Element_Type is
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begin
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if Position.Node = 0 then
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raise Constraint_Error;
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end if;
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pragma Assert (Vet (Position), "bad cursor in Element");
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declare
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N : Node_Array renames Position.Container.Nodes;
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begin
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return N (Position.Node).Element;
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end;
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end Element;
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----------
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-- Find --
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----------
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function Find
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(Container : List;
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Item : Element_Type;
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Position : Cursor := No_Element) return Cursor
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is
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Nodes : Node_Array renames Container.Nodes;
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Node : Count_Type := Position.Node;
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begin
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if Node = 0 then
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Node := Container.First;
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else
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if Position.Container /= Container'Unrestricted_Access then
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raise Program_Error;
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end if;
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pragma Assert (Vet (Position), "bad cursor in Find");
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end if;
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while Node /= 0 loop
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if Nodes (Node).Element = Item then
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return Cursor'(Container'Unrestricted_Access, Node);
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end if;
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Node := Nodes (Node).Next;
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end loop;
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return No_Element;
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end Find;
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-----------
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-- First --
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-----------
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function First (Container : List) return Cursor is
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begin
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if Container.First = 0 then
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return No_Element;
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end if;
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return Cursor'(Container'Unrestricted_Access, Container.First);
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end First;
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-------------------
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-- First_Element --
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-------------------
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function First_Element (Container : List) return Element_Type is
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N : Node_Array renames Container.Nodes;
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begin
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if Container.First = 0 then
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raise Constraint_Error;
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end if;
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return N (Container.First).Element;
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end First_Element;
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----------
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-- Free --
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----------
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procedure Free
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(Container : in out List'Class;
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X : Count_Type)
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is
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pragma Assert (X > 0);
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pragma Assert (X <= Container.Capacity);
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N : Node_Array renames Container.Nodes;
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begin
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N (X).Prev := -1; -- Node is deallocated (not on active list)
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if Container.Free >= 0 then
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N (X).Next := Container.Free;
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Container.Free := X;
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elsif X + 1 = abs Container.Free then
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N (X).Next := 0; -- Not strictly necessary, but marginally safer
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Container.Free := Container.Free + 1;
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else
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Container.Free := abs Container.Free;
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if Container.Free > Container.Capacity then
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Container.Free := 0;
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else
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for I in Container.Free .. Container.Capacity - 1 loop
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N (I).Next := I + 1;
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end loop;
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N (Container.Capacity).Next := 0;
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end if;
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N (X).Next := Container.Free;
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Container.Free := X;
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end if;
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end Free;
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---------------------
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-- Generic_Sorting --
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---------------------
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package body Generic_Sorting is
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---------------
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-- Is_Sorted --
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---------------
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function Is_Sorted (Container : List) return Boolean is
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Nodes : Node_Array renames Container.Nodes;
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Node : Count_Type := Container.First;
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begin
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for I in 2 .. Container.Length loop
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if Nodes (Nodes (Node).Next).Element < Nodes (Node).Element then
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return False;
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end if;
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Node := Nodes (Node).Next;
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end loop;
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return True;
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end Is_Sorted;
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----------
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-- Sort --
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----------
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procedure Sort (Container : in out List) is
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N : Node_Array renames Container.Nodes;
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procedure Partition (Pivot, Back : Count_Type);
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procedure Sort (Front, Back : Count_Type);
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---------------
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-- Partition --
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---------------
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procedure Partition (Pivot, Back : Count_Type) is
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Node : Count_Type := N (Pivot).Next;
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begin
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while Node /= Back loop
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if N (Node).Element < N (Pivot).Element then
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declare
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Prev : constant Count_Type := N (Node).Prev;
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Next : constant Count_Type := N (Node).Next;
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begin
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N (Prev).Next := Next;
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if Next = 0 then
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Container.Last := Prev;
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else
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N (Next).Prev := Prev;
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end if;
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N (Node).Next := Pivot;
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N (Node).Prev := N (Pivot).Prev;
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N (Pivot).Prev := Node;
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if N (Node).Prev = 0 then
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Container.First := Node;
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else
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N (N (Node).Prev).Next := Node;
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end if;
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Node := Next;
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end;
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else
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Node := N (Node).Next;
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end if;
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end loop;
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end Partition;
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----------
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-- Sort --
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----------
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procedure Sort (Front, Back : Count_Type) is
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Pivot : constant Count_Type :=
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(if Front = 0 then Container.First else N (Front).Next);
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begin
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if Pivot /= Back then
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Partition (Pivot, Back);
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Sort (Front, Pivot);
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Sort (Pivot, Back);
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end if;
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end Sort;
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|
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-- Start of processing for Sort
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begin
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if Container.Length <= 1 then
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return;
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end if;
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pragma Assert (N (Container.First).Prev = 0);
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pragma Assert (N (Container.Last).Next = 0);
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-- if Container.Busy > 0 then
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-- raise Program_Error;
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-- end if;
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Sort (Front => 0, Back => 0);
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pragma Assert (N (Container.First).Prev = 0);
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pragma Assert (N (Container.Last).Next = 0);
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end Sort;
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end Generic_Sorting;
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|
|
-----------------
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-- Has_Element --
|
|
-----------------
|
|
|
|
function Has_Element (Position : Cursor) return Boolean is
|
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begin
|
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pragma Assert (Vet (Position), "bad cursor in Has_Element");
|
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return Position.Node /= 0;
|
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end Has_Element;
|
|
|
|
------------
|
|
-- Insert --
|
|
------------
|
|
|
|
procedure Insert
|
|
(Container : in out List;
|
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Before : Cursor;
|
|
New_Item : Element_Type;
|
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Position : out Cursor;
|
|
Count : Count_Type := 1)
|
|
is
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First_Node : Count_Type;
|
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New_Node : Count_Type;
|
|
|
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begin
|
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if Before.Container /= null then
|
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if Before.Container /= Container'Unrestricted_Access then
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raise Program_Error;
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end if;
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|
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pragma Assert (Vet (Before), "bad cursor in Insert");
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end if;
|
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|
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if Count = 0 then
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Position := Before;
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return;
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end if;
|
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|
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if Container.Length > Container.Capacity - Count then
|
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raise Constraint_Error;
|
|
end if;
|
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|
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-- if Container.Busy > 0 then
|
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-- raise Program_Error;
|
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-- end if;
|
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|
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Allocate (Container, New_Item, New_Node);
|
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First_Node := New_Node;
|
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Insert_Internal (Container, Before.Node, New_Node);
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|
|
for Index in 2 .. Count loop
|
|
Allocate (Container, New_Item, New_Node);
|
|
Insert_Internal (Container, Before.Node, New_Node);
|
|
end loop;
|
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|
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Position := Cursor'(Container'Unrestricted_Access, First_Node);
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|
end Insert;
|
|
|
|
procedure Insert
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|
(Container : in out List;
|
|
Before : Cursor;
|
|
New_Item : Element_Type;
|
|
Count : Count_Type := 1)
|
|
is
|
|
Position : Cursor;
|
|
pragma Unreferenced (Position);
|
|
begin
|
|
Insert (Container, Before, New_Item, Position, Count);
|
|
end Insert;
|
|
|
|
procedure Insert
|
|
(Container : in out List;
|
|
Before : Cursor;
|
|
Position : out Cursor;
|
|
Count : Count_Type := 1)
|
|
is
|
|
New_Item : Element_Type; -- Do we need to reinit node ???
|
|
pragma Warnings (Off, New_Item);
|
|
|
|
begin
|
|
Insert (Container, Before, New_Item, Position, Count);
|
|
end Insert;
|
|
|
|
---------------------
|
|
-- Insert_Internal --
|
|
---------------------
|
|
|
|
procedure Insert_Internal
|
|
(Container : in out List'Class;
|
|
Before : Count_Type;
|
|
New_Node : Count_Type)
|
|
is
|
|
N : Node_Array renames Container.Nodes;
|
|
|
|
begin
|
|
if Container.Length = 0 then
|
|
pragma Assert (Before = 0);
|
|
pragma Assert (Container.First = 0);
|
|
pragma Assert (Container.Last = 0);
|
|
|
|
Container.First := New_Node;
|
|
Container.Last := New_Node;
|
|
|
|
N (Container.First).Prev := 0;
|
|
N (Container.Last).Next := 0;
|
|
|
|
elsif Before = 0 then
|
|
pragma Assert (N (Container.Last).Next = 0);
|
|
|
|
N (Container.Last).Next := New_Node;
|
|
N (New_Node).Prev := Container.Last;
|
|
|
|
Container.Last := New_Node;
|
|
N (Container.Last).Next := 0;
|
|
|
|
elsif Before = Container.First then
|
|
pragma Assert (N (Container.First).Prev = 0);
|
|
|
|
N (Container.First).Prev := New_Node;
|
|
N (New_Node).Next := Container.First;
|
|
|
|
Container.First := New_Node;
|
|
N (Container.First).Prev := 0;
|
|
|
|
else
|
|
pragma Assert (N (Container.First).Prev = 0);
|
|
pragma Assert (N (Container.Last).Next = 0);
|
|
|
|
N (New_Node).Next := Before;
|
|
N (New_Node).Prev := N (Before).Prev;
|
|
|
|
N (N (Before).Prev).Next := New_Node;
|
|
N (Before).Prev := New_Node;
|
|
end if;
|
|
|
|
Container.Length := Container.Length + 1;
|
|
end Insert_Internal;
|
|
|
|
--------------
|
|
-- Is_Empty --
|
|
--------------
|
|
|
|
function Is_Empty (Container : List) return Boolean is
|
|
begin
|
|
return Container.Length = 0;
|
|
end Is_Empty;
|
|
|
|
-------------
|
|
-- Iterate --
|
|
-------------
|
|
|
|
procedure Iterate
|
|
(Container : List;
|
|
Process : not null access procedure (Position : Cursor))
|
|
is
|
|
C : List renames Container'Unrestricted_Access.all;
|
|
N : Node_Array renames C.Nodes;
|
|
-- B : Natural renames C.Busy;
|
|
|
|
Node : Count_Type := Container.First;
|
|
|
|
Index : Count_Type := 0;
|
|
Index_Max : constant Count_Type := Container.Length;
|
|
|
|
begin
|
|
if Index_Max = 0 then
|
|
pragma Assert (Node = 0);
|
|
return;
|
|
end if;
|
|
|
|
loop
|
|
pragma Assert (Node /= 0);
|
|
|
|
Process (Cursor'(C'Unchecked_Access, Node));
|
|
pragma Assert (Container.Length = Index_Max);
|
|
pragma Assert (N (Node).Prev /= -1);
|
|
|
|
Node := N (Node).Next;
|
|
Index := Index + 1;
|
|
|
|
if Index = Index_Max then
|
|
pragma Assert (Node = 0);
|
|
return;
|
|
end if;
|
|
end loop;
|
|
end Iterate;
|
|
|
|
----------
|
|
-- Last --
|
|
----------
|
|
|
|
function Last (Container : List) return Cursor is
|
|
begin
|
|
if Container.Last = 0 then
|
|
return No_Element;
|
|
end if;
|
|
|
|
return Cursor'(Container'Unrestricted_Access, Container.Last);
|
|
end Last;
|
|
|
|
------------------
|
|
-- Last_Element --
|
|
------------------
|
|
|
|
function Last_Element (Container : List) return Element_Type is
|
|
N : Node_Array renames Container.Nodes;
|
|
|
|
begin
|
|
if Container.Last = 0 then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
return N (Container.Last).Element;
|
|
end Last_Element;
|
|
|
|
------------
|
|
-- Length --
|
|
------------
|
|
|
|
function Length (Container : List) return Count_Type is
|
|
begin
|
|
return Container.Length;
|
|
end Length;
|
|
|
|
----------
|
|
-- Next --
|
|
----------
|
|
|
|
procedure Next (Position : in out Cursor) is
|
|
begin
|
|
Position := Next (Position);
|
|
end Next;
|
|
|
|
function Next (Position : Cursor) return Cursor is
|
|
begin
|
|
if Position.Node = 0 then
|
|
return No_Element;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Next");
|
|
|
|
declare
|
|
Nodes : Node_Array renames Position.Container.Nodes;
|
|
Node : constant Count_Type := Nodes (Position.Node).Next;
|
|
|
|
begin
|
|
if Node = 0 then
|
|
return No_Element;
|
|
end if;
|
|
|
|
return Cursor'(Position.Container, Node);
|
|
end;
|
|
end Next;
|
|
|
|
-------------
|
|
-- Prepend --
|
|
-------------
|
|
|
|
procedure Prepend
|
|
(Container : in out List;
|
|
New_Item : Element_Type;
|
|
Count : Count_Type := 1)
|
|
is
|
|
begin
|
|
Insert (Container, First (Container), New_Item, Count);
|
|
end Prepend;
|
|
|
|
--------------
|
|
-- Previous --
|
|
--------------
|
|
|
|
procedure Previous (Position : in out Cursor) is
|
|
begin
|
|
Position := Previous (Position);
|
|
end Previous;
|
|
|
|
function Previous (Position : Cursor) return Cursor is
|
|
begin
|
|
if Position.Node = 0 then
|
|
return No_Element;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Previous");
|
|
|
|
declare
|
|
Nodes : Node_Array renames Position.Container.Nodes;
|
|
Node : constant Count_Type := Nodes (Position.Node).Prev;
|
|
begin
|
|
if Node = 0 then
|
|
return No_Element;
|
|
end if;
|
|
|
|
return Cursor'(Position.Container, Node);
|
|
end;
|
|
end Previous;
|
|
|
|
-------------------
|
|
-- Query_Element --
|
|
-------------------
|
|
|
|
procedure Query_Element
|
|
(Position : Cursor;
|
|
Process : not null access procedure (Element : Element_Type))
|
|
is
|
|
begin
|
|
if Position.Node = 0 then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Query_Element");
|
|
|
|
declare
|
|
C : List renames Position.Container.all'Unrestricted_Access.all;
|
|
N : Node_Type renames C.Nodes (Position.Node);
|
|
|
|
begin
|
|
Process (N.Element);
|
|
pragma Assert (N.Prev >= 0);
|
|
end;
|
|
end Query_Element;
|
|
|
|
---------------------
|
|
-- Replace_Element --
|
|
---------------------
|
|
|
|
procedure Replace_Element
|
|
(Container : in out List;
|
|
Position : Cursor;
|
|
New_Item : Element_Type)
|
|
is
|
|
begin
|
|
if Position.Container = null then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
if Position.Container /= Container'Unrestricted_Access then
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
-- if Container.Lock > 0 then
|
|
-- raise Program_Error;
|
|
-- end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Replace_Element");
|
|
|
|
declare
|
|
N : Node_Array renames Container.Nodes;
|
|
begin
|
|
N (Position.Node).Element := New_Item;
|
|
end;
|
|
end Replace_Element;
|
|
|
|
----------------------
|
|
-- Reverse_Elements --
|
|
----------------------
|
|
|
|
procedure Reverse_Elements (Container : in out List) is
|
|
N : Node_Array renames Container.Nodes;
|
|
I : Count_Type := Container.First;
|
|
J : Count_Type := Container.Last;
|
|
|
|
procedure Swap (L, R : Count_Type);
|
|
|
|
----------
|
|
-- Swap --
|
|
----------
|
|
|
|
procedure Swap (L, R : Count_Type) is
|
|
LN : constant Count_Type := N (L).Next;
|
|
LP : constant Count_Type := N (L).Prev;
|
|
|
|
RN : constant Count_Type := N (R).Next;
|
|
RP : constant Count_Type := N (R).Prev;
|
|
|
|
begin
|
|
if LP /= 0 then
|
|
N (LP).Next := R;
|
|
end if;
|
|
|
|
if RN /= 0 then
|
|
N (RN).Prev := L;
|
|
end if;
|
|
|
|
N (L).Next := RN;
|
|
N (R).Prev := LP;
|
|
|
|
if LN = R then
|
|
pragma Assert (RP = L);
|
|
|
|
N (L).Prev := R;
|
|
N (R).Next := L;
|
|
|
|
else
|
|
N (L).Prev := RP;
|
|
N (RP).Next := L;
|
|
|
|
N (R).Next := LN;
|
|
N (LN).Prev := R;
|
|
end if;
|
|
end Swap;
|
|
|
|
-- Start of processing for Reverse_Elements
|
|
|
|
begin
|
|
if Container.Length <= 1 then
|
|
return;
|
|
end if;
|
|
|
|
pragma Assert (N (Container.First).Prev = 0);
|
|
pragma Assert (N (Container.Last).Next = 0);
|
|
|
|
-- if Container.Busy > 0 then
|
|
-- raise Program_Error;
|
|
-- end if;
|
|
|
|
Container.First := J;
|
|
Container.Last := I;
|
|
loop
|
|
Swap (L => I, R => J);
|
|
|
|
J := N (J).Next;
|
|
exit when I = J;
|
|
|
|
I := N (I).Prev;
|
|
exit when I = J;
|
|
|
|
Swap (L => J, R => I);
|
|
|
|
I := N (I).Next;
|
|
exit when I = J;
|
|
|
|
J := N (J).Prev;
|
|
exit when I = J;
|
|
end loop;
|
|
|
|
pragma Assert (N (Container.First).Prev = 0);
|
|
pragma Assert (N (Container.Last).Next = 0);
|
|
end Reverse_Elements;
|
|
|
|
------------------
|
|
-- Reverse_Find --
|
|
------------------
|
|
|
|
function Reverse_Find
|
|
(Container : List;
|
|
Item : Element_Type;
|
|
Position : Cursor := No_Element) return Cursor
|
|
is
|
|
N : Node_Array renames Container.Nodes;
|
|
Node : Count_Type := Position.Node;
|
|
|
|
begin
|
|
if Node = 0 then
|
|
Node := Container.Last;
|
|
|
|
else
|
|
if Position.Container /= Container'Unrestricted_Access then
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Reverse_Find");
|
|
end if;
|
|
|
|
while Node /= 0 loop
|
|
if N (Node).Element = Item then
|
|
return Cursor'(Container'Unrestricted_Access, Node);
|
|
end if;
|
|
|
|
Node := N (Node).Prev;
|
|
end loop;
|
|
|
|
return No_Element;
|
|
end Reverse_Find;
|
|
|
|
---------------------
|
|
-- Reverse_Iterate --
|
|
---------------------
|
|
|
|
procedure Reverse_Iterate
|
|
(Container : List;
|
|
Process : not null access procedure (Position : Cursor))
|
|
is
|
|
C : List renames Container'Unrestricted_Access.all;
|
|
N : Node_Array renames C.Nodes;
|
|
-- B : Natural renames C.Busy;
|
|
|
|
Node : Count_Type := Container.Last;
|
|
|
|
Index : Count_Type := 0;
|
|
Index_Max : constant Count_Type := Container.Length;
|
|
|
|
begin
|
|
if Index_Max = 0 then
|
|
pragma Assert (Node = 0);
|
|
return;
|
|
end if;
|
|
|
|
loop
|
|
pragma Assert (Node > 0);
|
|
|
|
Process (Cursor'(C'Unchecked_Access, Node));
|
|
pragma Assert (Container.Length = Index_Max);
|
|
pragma Assert (N (Node).Prev /= -1);
|
|
|
|
Node := N (Node).Prev;
|
|
Index := Index + 1;
|
|
|
|
if Index = Index_Max then
|
|
pragma Assert (Node = 0);
|
|
return;
|
|
end if;
|
|
end loop;
|
|
end Reverse_Iterate;
|
|
|
|
------------
|
|
-- Splice --
|
|
------------
|
|
|
|
procedure Splice
|
|
(Container : in out List;
|
|
Before : Cursor;
|
|
Position : in out Cursor)
|
|
is
|
|
N : Node_Array renames Container.Nodes;
|
|
|
|
begin
|
|
if Before.Container /= null then
|
|
if Before.Container /= Container'Unrestricted_Access then
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Before), "bad Before cursor in Splice");
|
|
end if;
|
|
|
|
if Position.Node = 0 then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
if Position.Container /= Container'Unrestricted_Access then
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad Position cursor in Splice");
|
|
|
|
if Position.Node = Before.Node
|
|
or else N (Position.Node).Next = Before.Node
|
|
then
|
|
return;
|
|
end if;
|
|
|
|
pragma Assert (Container.Length >= 2);
|
|
|
|
-- if Container.Busy > 0 then
|
|
-- raise Program_Error;
|
|
-- end if;
|
|
|
|
if Before.Node = 0 then
|
|
pragma Assert (Position.Node /= Container.Last);
|
|
|
|
if Position.Node = Container.First then
|
|
Container.First := N (Position.Node).Next;
|
|
N (Container.First).Prev := 0;
|
|
|
|
else
|
|
N (N (Position.Node).Prev).Next := N (Position.Node).Next;
|
|
N (N (Position.Node).Next).Prev := N (Position.Node).Prev;
|
|
end if;
|
|
|
|
N (Container.Last).Next := Position.Node;
|
|
N (Position.Node).Prev := Container.Last;
|
|
|
|
Container.Last := Position.Node;
|
|
N (Container.Last).Next := 0;
|
|
|
|
return;
|
|
end if;
|
|
|
|
if Before.Node = Container.First then
|
|
pragma Assert (Position.Node /= Container.First);
|
|
|
|
if Position.Node = Container.Last then
|
|
Container.Last := N (Position.Node).Prev;
|
|
N (Container.Last).Next := 0;
|
|
|
|
else
|
|
N (N (Position.Node).Prev).Next := N (Position.Node).Next;
|
|
N (N (Position.Node).Next).Prev := N (Position.Node).Prev;
|
|
end if;
|
|
|
|
N (Container.First).Prev := Position.Node;
|
|
N (Position.Node).Next := Container.First;
|
|
|
|
Container.First := Position.Node;
|
|
N (Container.First).Prev := 0;
|
|
|
|
return;
|
|
end if;
|
|
|
|
if Position.Node = Container.First then
|
|
Container.First := N (Position.Node).Next;
|
|
N (Container.First).Prev := 0;
|
|
|
|
elsif Position.Node = Container.Last then
|
|
Container.Last := N (Position.Node).Prev;
|
|
N (Container.Last).Next := 0;
|
|
|
|
else
|
|
N (N (Position.Node).Prev).Next := N (Position.Node).Next;
|
|
N (N (Position.Node).Next).Prev := N (Position.Node).Prev;
|
|
end if;
|
|
|
|
N (N (Before.Node).Prev).Next := Position.Node;
|
|
N (Position.Node).Prev := N (Before.Node).Prev;
|
|
|
|
N (Before.Node).Prev := Position.Node;
|
|
N (Position.Node).Next := Before.Node;
|
|
|
|
pragma Assert (N (Container.First).Prev = 0);
|
|
pragma Assert (N (Container.Last).Next = 0);
|
|
end Splice;
|
|
|
|
----------
|
|
-- Swap --
|
|
----------
|
|
|
|
procedure Swap
|
|
(Container : in out List;
|
|
I, J : Cursor)
|
|
is
|
|
begin
|
|
if I.Node = 0
|
|
or else J.Node = 0
|
|
then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
if I.Container /= Container'Unrestricted_Access
|
|
or else J.Container /= Container'Unrestricted_Access
|
|
then
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
if I.Node = J.Node then
|
|
return;
|
|
end if;
|
|
|
|
-- if Container.Lock > 0 then
|
|
-- raise Program_Error;
|
|
-- end if;
|
|
|
|
pragma Assert (Vet (I), "bad I cursor in Swap");
|
|
pragma Assert (Vet (J), "bad J cursor in Swap");
|
|
|
|
declare
|
|
N : Node_Array renames Container.Nodes;
|
|
|
|
EI : Element_Type renames N (I.Node).Element;
|
|
EJ : Element_Type renames N (J.Node).Element;
|
|
|
|
EI_Copy : constant Element_Type := EI;
|
|
|
|
begin
|
|
EI := EJ;
|
|
EJ := EI_Copy;
|
|
end;
|
|
end Swap;
|
|
|
|
----------------
|
|
-- Swap_Links --
|
|
----------------
|
|
|
|
procedure Swap_Links
|
|
(Container : in out List;
|
|
I, J : Cursor)
|
|
is
|
|
begin
|
|
if I.Node = 0
|
|
or else J.Node = 0
|
|
then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
if I.Container /= Container'Unrestricted_Access
|
|
or else I.Container /= J.Container
|
|
then
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
if I.Node = J.Node then
|
|
return;
|
|
end if;
|
|
|
|
-- if Container.Busy > 0 then
|
|
-- raise Program_Error;
|
|
-- end if;
|
|
|
|
pragma Assert (Vet (I), "bad I cursor in Swap_Links");
|
|
pragma Assert (Vet (J), "bad J cursor in Swap_Links");
|
|
|
|
declare
|
|
I_Next : constant Cursor := Next (I);
|
|
|
|
J_Copy : Cursor := J;
|
|
pragma Warnings (Off, J_Copy);
|
|
|
|
begin
|
|
if I_Next = J then
|
|
Splice (Container, Before => I, Position => J_Copy);
|
|
|
|
else
|
|
declare
|
|
J_Next : constant Cursor := Next (J);
|
|
|
|
I_Copy : Cursor := I;
|
|
pragma Warnings (Off, I_Copy);
|
|
|
|
begin
|
|
if J_Next = I then
|
|
Splice (Container, Before => J, Position => I_Copy);
|
|
|
|
else
|
|
pragma Assert (Container.Length >= 3);
|
|
|
|
Splice (Container, Before => I_Next, Position => J_Copy);
|
|
Splice (Container, Before => J_Next, Position => I_Copy);
|
|
end if;
|
|
end;
|
|
end if;
|
|
end;
|
|
end Swap_Links;
|
|
|
|
--------------------
|
|
-- Update_Element --
|
|
--------------------
|
|
|
|
procedure Update_Element
|
|
(Container : in out List;
|
|
Position : Cursor;
|
|
Process : not null access procedure (Element : in out Element_Type))
|
|
is
|
|
begin
|
|
if Position.Node = 0 then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
if Position.Container /= Container'Unrestricted_Access then
|
|
raise Program_Error;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Update_Element");
|
|
|
|
declare
|
|
N : Node_Type renames Container.Nodes (Position.Node);
|
|
|
|
begin
|
|
Process (N.Element);
|
|
pragma Assert (N.Prev >= 0);
|
|
end;
|
|
end Update_Element;
|
|
|
|
---------
|
|
-- Vet --
|
|
---------
|
|
|
|
function Vet (Position : Cursor) return Boolean is
|
|
begin
|
|
if Position.Node = 0 then
|
|
return Position.Container = null;
|
|
end if;
|
|
|
|
if Position.Container = null then
|
|
return False;
|
|
end if;
|
|
|
|
declare
|
|
L : List renames Position.Container.all;
|
|
N : Node_Array renames L.Nodes;
|
|
|
|
begin
|
|
if L.Length = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if L.First = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if L.Last = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if Position.Node > L.Capacity then
|
|
return False;
|
|
end if;
|
|
|
|
if N (Position.Node).Prev < 0
|
|
or else N (Position.Node).Prev > L.Capacity
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
if N (Position.Node).Next > L.Capacity then
|
|
return False;
|
|
end if;
|
|
|
|
if N (L.First).Prev /= 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if N (L.Last).Next /= 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if N (Position.Node).Prev = 0
|
|
and then Position.Node /= L.First
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
if N (Position.Node).Next = 0
|
|
and then Position.Node /= L.Last
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
if L.Length = 1 then
|
|
return L.First = L.Last;
|
|
end if;
|
|
|
|
if L.First = L.Last then
|
|
return False;
|
|
end if;
|
|
|
|
if N (L.First).Next = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if N (L.Last).Prev = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if N (N (L.First).Next).Prev /= L.First then
|
|
return False;
|
|
end if;
|
|
|
|
if N (N (L.Last).Prev).Next /= L.Last then
|
|
return False;
|
|
end if;
|
|
|
|
if L.Length = 2 then
|
|
if N (L.First).Next /= L.Last then
|
|
return False;
|
|
end if;
|
|
|
|
if N (L.Last).Prev /= L.First then
|
|
return False;
|
|
end if;
|
|
|
|
return True;
|
|
end if;
|
|
|
|
if N (L.First).Next = L.Last then
|
|
return False;
|
|
end if;
|
|
|
|
if N (L.Last).Prev = L.First then
|
|
return False;
|
|
end if;
|
|
|
|
if Position.Node = L.First then
|
|
return True;
|
|
end if;
|
|
|
|
if Position.Node = L.Last then
|
|
return True;
|
|
end if;
|
|
|
|
if N (Position.Node).Next = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if N (Position.Node).Prev = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if N (N (Position.Node).Next).Prev /= Position.Node then
|
|
return False;
|
|
end if;
|
|
|
|
if N (N (Position.Node).Prev).Next /= Position.Node then
|
|
return False;
|
|
end if;
|
|
|
|
if L.Length = 3 then
|
|
if N (L.First).Next /= Position.Node then
|
|
return False;
|
|
end if;
|
|
|
|
if N (L.Last).Prev /= Position.Node then
|
|
return False;
|
|
end if;
|
|
end if;
|
|
|
|
return True;
|
|
end;
|
|
end Vet;
|
|
|
|
end Ada.Containers.Restricted_Doubly_Linked_Lists;
|