-- --
-- GNAT LIBRARY COMPONENTS --
-- --
--- A D A . C O N T A I N E R S . --
--- I N D E F I N I T E _ D O U B L Y _ L I N K E D _ L I S T S --
+-- ADA.CONTAINERS.INDEFINITE_DOUBLY_LINKED_LISTS --
-- --
-- B o d y --
-- --
--- Copyright (C) 2004-2005 Free Software Foundation, Inc. --
--- --
--- This specification is derived from the Ada Reference Manual for use with --
--- GNAT. The copyright notice above, and the license provisions that follow --
--- apply solely to the contents of the part following the private keyword. --
+-- Copyright (C) 2004-2009, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
-- --
-- This unit was originally developed by Matthew J Heaney. --
------------------------------------------------------------------------------
procedure Clear (Container : in out List) is
X : Node_Access;
+ pragma Warnings (Off, X);
begin
if Container.Length = 0 then
pragma Assert (Container.Last.Next = null);
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
while Container.Length > 1 loop
function Contains
(Container : List;
- Item : Element_Type) return Boolean is
+ Item : Element_Type) return Boolean
+ is
begin
return Find (Container, Item) /= No_Element;
end Contains;
X : Node_Access;
begin
- pragma Assert (Vet (Position), "bad cursor in Delete");
-
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with
+ "Position cursor has no element";
+ end if;
+
+ if Position.Node.Element = null then
+ raise Program_Error with
+ "Position cursor has no element";
end if;
if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error;
+ raise Program_Error with
+ "Position cursor designates wrong container";
end if;
+ pragma Assert (Vet (Position), "bad cursor in Delete");
+
if Position.Node = Container.First then
Delete_First (Container, Count);
- Position := First (Container);
+ Position := No_Element; -- Post-York behavior
return;
end if;
if Count = 0 then
+ Position := No_Element; -- Post-York behavior
return;
end if;
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
for Index in 1 .. Count loop
Free (X);
end loop;
+
+ Position := No_Element; -- Post-York behavior
end Delete;
------------------
end if;
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
for I in 1 .. Count loop
end if;
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
for I in 1 .. Count loop
function Element (Position : Cursor) return Element_Type is
begin
- pragma Assert (Vet (Position), "bad cursor in Element");
-
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with
+ "Position cursor has no element";
+ end if;
+
+ if Position.Node.Element = null then
+ raise Program_Error with
+ "Position cursor has no element";
end if;
+ pragma Assert (Vet (Position), "bad cursor in Element");
+
return Position.Node.Element.all;
end Element;
Node := Container.First;
else
- pragma Assert (Vet (Position), "bad cursor in Find");
+ if Node.Element = null then
+ raise Program_Error;
+ end if;
if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error;
+ raise Program_Error with
+ "Position cursor designates wrong container";
end if;
+
+ pragma Assert (Vet (Position), "bad cursor in Find");
end if;
while Node /= null loop
function First_Element (Container : List) return Element_Type is
begin
if Container.First = null then
- raise Constraint_Error;
+ raise Constraint_Error with "list is empty";
end if;
return Container.First.Element.all;
(Target : in out List;
Source : in out List)
is
- LI : Cursor;
- RI : Cursor;
+ LI, RI : Cursor;
begin
if Target'Address = Source'Address then
return;
end if;
- if Target.Busy > 0
- or else Source.Busy > 0
- then
- raise Program_Error;
+ if Target.Busy > 0 then
+ raise Program_Error with
+ "attempt to tamper with elements of Target (list is busy)";
+ end if;
+
+ if Source.Busy > 0 then
+ raise Program_Error with
+ "attempt to tamper with elements of Source (list is busy)";
end if;
LI := First (Target);
RI := First (Source);
while RI.Node /= null loop
+ pragma Assert (RI.Node.Next = null
+ or else not (RI.Node.Next.Element.all <
+ RI.Node.Element.all));
+
if LI.Node = null then
Splice (Target, No_Element, Source);
return;
end if;
+ pragma Assert (LI.Node.Next = null
+ or else not (LI.Node.Next.Element.all <
+ LI.Node.Element.all));
+
if RI.Node.Element.all < LI.Node.Element.all then
declare
RJ : Cursor := RI;
+ pragma Warnings (Off, RJ);
begin
RI.Node := RI.Node.Next;
Splice (Target, LI, Source, RJ);
----------
procedure Sort (Front, Back : Node_Access) is
- Pivot : Node_Access;
-
+ Pivot : constant Node_Access :=
+ (if Front = null then Container.First else Front.Next);
begin
- if Front = null then
- Pivot := Container.First;
- else
- Pivot := Front.Next;
- end if;
-
if Pivot /= Back then
Partition (Pivot, Back);
Sort (Front, Pivot);
pragma Assert (Container.Last.Next = null);
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
Sort (Front => null, Back => null);
New_Node : Node_Access;
begin
- pragma Assert (Vet (Before), "bad cursor in Insert");
+ if Before.Container /= null then
+ if Before.Container /= Container'Unrestricted_Access then
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
+ end if;
- if Before.Container /= null
- and then Before.Container /= Container'Unrestricted_Access
- then
- raise Program_Error;
+ if Before.Node = null
+ or else Before.Node.Element = null
+ then
+ raise Program_Error with
+ "Before cursor has no element";
+ end if;
+
+ pragma Assert (Vet (Before), "bad cursor in Insert");
end if;
if Count = 0 then
end if;
if Container.Length > Count_Type'Last - Count then
- raise Constraint_Error;
+ raise Constraint_Error with "new length exceeds maximum";
end if;
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
declare
Count : Count_Type := 1)
is
Position : Cursor;
+ pragma Unreferenced (Position);
begin
Insert (Container, Before, New_Item, Position, Count);
end Insert;
procedure Iterate
(Container : List;
- Process : not null access procedure (Position : in Cursor))
+ Process : not null access procedure (Position : Cursor))
is
C : List renames Container'Unrestricted_Access.all;
B : Natural renames C.Busy;
function Last_Element (Container : List) return Element_Type is
begin
if Container.Last = null then
- raise Constraint_Error;
+ raise Constraint_Error with "list is empty";
end if;
return Container.Last.Element.all;
end if;
if Source.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements of Source (list is busy)";
end if;
Clear (Target);
procedure Next (Position : in out Cursor) is
begin
- pragma Assert (Vet (Position), "bad cursor in procedure Next");
-
- if Position.Node = null then
- return;
- end if;
-
- Position.Node := Position.Node.Next;
-
- if Position.Node = null then
- Position.Container := null;
- end if;
+ Position := Next (Position);
end Next;
function Next (Position : Cursor) return Cursor is
begin
- pragma Assert (Vet (Position), "bad cursor in function Next");
-
if Position.Node = null then
return No_Element;
end if;
+ pragma Assert (Vet (Position), "bad cursor in Next");
+
declare
Next_Node : constant Node_Access := Position.Node.Next;
begin
procedure Previous (Position : in out Cursor) is
begin
- pragma Assert (Vet (Position), "bad cursor in procedure Previous");
-
- if Position.Node = null then
- return;
- end if;
-
- Position.Node := Position.Node.Prev;
-
- if Position.Node = null then
- Position.Container := null;
- end if;
+ Position := Previous (Position);
end Previous;
function Previous (Position : Cursor) return Cursor is
begin
- pragma Assert (Vet (Position), "bad cursor in function Previous");
-
if Position.Node = null then
return No_Element;
end if;
+ pragma Assert (Vet (Position), "bad cursor in Previous");
+
declare
Prev_Node : constant Node_Access := Position.Node.Prev;
begin
procedure Query_Element
(Position : Cursor;
- Process : not null access procedure (Element : in Element_Type))
+ Process : not null access procedure (Element : Element_Type))
is
begin
- pragma Assert (Vet (Position), "bad cursor in Query_Element");
-
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with
+ "Position cursor has no element";
+ end if;
+
+ if Position.Node.Element = null then
+ raise Program_Error with
+ "Position cursor has no element";
end if;
+ pragma Assert (Vet (Position), "bad cursor in Query_Element");
+
declare
C : List renames Position.Container.all'Unrestricted_Access.all;
B : Natural renames C.Busy;
----------
procedure Read
- (Stream : access Root_Stream_Type'Class;
+ (Stream : not null access Root_Stream_Type'Class;
Item : out List)
is
N : Count_Type'Base;
end loop;
end Read;
+ procedure Read
+ (Stream : not null access Root_Stream_Type'Class;
+ Item : out Cursor)
+ is
+ begin
+ raise Program_Error with "attempt to stream list cursor";
+ end Read;
+
---------------------
-- Replace_Element --
---------------------
procedure Replace_Element
- (Position : Cursor;
- By : Element_Type)
+ (Container : in out List;
+ Position : Cursor;
+ New_Item : Element_Type)
is
begin
- pragma Assert (Vet (Position), "bad cursor in Replace_Element");
-
if Position.Container = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Position cursor has no element";
end if;
- if Position.Container.Lock > 0 then
- raise Program_Error;
+ if Position.Container /= Container'Unchecked_Access then
+ raise Program_Error with
+ "Position cursor designates wrong container";
end if;
- declare
- X : Element_Access := Position.Node.Element;
- begin
- Position.Node.Element := new Element_Type'(By);
- Free (X);
- end;
- end Replace_Element;
-
- ------------------
- -- Reverse_Find --
- ------------------
-
- function Reverse_Find
- (Container : List;
- Item : Element_Type;
- Position : Cursor := No_Element) return Cursor
- is
- Node : Node_Access := Position.Node;
-
- begin
- if Node = null then
- Node := Container.Last;
-
- else
- pragma Assert (Vet (Position), "bad cursor in Reverse_Find");
-
- if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error;
- end if;
+ if Container.Lock > 0 then
+ raise Program_Error with
+ "attempt to tamper with cursors (list is locked)";
end if;
- while Node /= null loop
- if Node.Element.all = Item then
- return Cursor'(Container'Unchecked_Access, Node);
- end if;
-
- Node := Node.Prev;
- end loop;
-
- return No_Element;
- end Reverse_Find;
-
- ---------------------
- -- Reverse_Iterate --
- ---------------------
-
- procedure Reverse_Iterate
- (Container : List;
- Process : not null access procedure (Position : in Cursor))
- is
- C : List renames Container'Unrestricted_Access.all;
- B : Natural renames C.Busy;
+ if Position.Node.Element = null then
+ raise Program_Error with
+ "Position cursor has no element";
+ end if;
- Node : Node_Access := Container.Last;
+ pragma Assert (Vet (Position), "bad cursor in Replace_Element");
- begin
- B := B + 1;
+ declare
+ X : Element_Access := Position.Node.Element;
begin
- while Node /= null loop
- Process (Cursor'(Container'Unchecked_Access, Node));
- Node := Node.Prev;
- end loop;
- exception
- when others =>
- B := B - 1;
- raise;
+ Position.Node.Element := new Element_Type'(New_Item);
+ Free (X);
end;
+ end Replace_Element;
- B := B - 1;
- end Reverse_Iterate;
-
- ------------------
- -- Reverse_List --
- ------------------
+ ----------------------
+ -- Reverse_Elements --
+ ----------------------
- procedure Reverse_List (Container : in out List) is
+ procedure Reverse_Elements (Container : in out List) is
I : Node_Access := Container.First;
J : Node_Access := Container.Last;
end if;
end Swap;
- -- Start of processing for Reverse_List
+ -- Start of processing for Reverse_Elements
begin
if Container.Length <= 1 then
pragma Assert (Container.Last.Next = null);
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
Container.First := J;
pragma Assert (Container.First.Prev = null);
pragma Assert (Container.Last.Next = null);
- end Reverse_List;
+ end Reverse_Elements;
+
+ ------------------
+ -- Reverse_Find --
+ ------------------
+
+ function Reverse_Find
+ (Container : List;
+ Item : Element_Type;
+ Position : Cursor := No_Element) return Cursor
+ is
+ Node : Node_Access := Position.Node;
+
+ begin
+ if Node = null then
+ Node := Container.Last;
+
+ else
+ if Node.Element = null then
+ raise Program_Error with "Position cursor has no element";
+ end if;
+
+ if Position.Container /= Container'Unrestricted_Access then
+ raise Program_Error with
+ "Position cursor designates wrong container";
+ end if;
+
+ pragma Assert (Vet (Position), "bad cursor in Reverse_Find");
+ end if;
+
+ while Node /= null loop
+ if Node.Element.all = Item then
+ return Cursor'(Container'Unchecked_Access, Node);
+ end if;
+
+ Node := 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;
+ B : Natural renames C.Busy;
+
+ Node : Node_Access := Container.Last;
+
+ begin
+ B := B + 1;
+
+ begin
+ while Node /= null loop
+ Process (Cursor'(Container'Unchecked_Access, Node));
+ Node := Node.Prev;
+ end loop;
+ exception
+ when others =>
+ B := B - 1;
+ raise;
+ end;
+
+ B := B - 1;
+ end Reverse_Iterate;
------------
-- Splice --
Source : in out List)
is
begin
- pragma Assert (Vet (Before), "bad cursor in Splice");
+ if Before.Container /= null then
+ if Before.Container /= Target'Unrestricted_Access then
+ raise Program_Error with
+ "Before cursor designates wrong container";
+ end if;
- if Before.Container /= null
- and then Before.Container /= Target'Unrestricted_Access
- then
- raise Program_Error;
+ if Before.Node = null
+ or else Before.Node.Element = null
+ then
+ raise Program_Error with
+ "Before cursor has no element";
+ end if;
+
+ pragma Assert (Vet (Before), "bad cursor in Splice");
end if;
if Target'Address = Source'Address
pragma Assert (Source.Last.Next = null);
if Target.Length > Count_Type'Last - Source.Length then
- raise Constraint_Error;
+ raise Constraint_Error with "new length exceeds maximum";
end if;
- if Target.Busy > 0
- or else Source.Busy > 0
- then
- raise Program_Error;
+ if Target.Busy > 0 then
+ raise Program_Error with
+ "attempt to tamper with elements of Target (list is busy)";
+ end if;
+
+ if Source.Busy > 0 then
+ raise Program_Error with
+ "attempt to tamper with elements of Source (list is busy)";
end if;
if Target.Length = 0 then
end Splice;
procedure Splice
- (Target : in out List;
- Before : Cursor;
- Position : Cursor)
+ (Container : in out List;
+ Before : Cursor;
+ Position : Cursor)
is
begin
- pragma Assert (Vet (Before), "bad Before cursor in Splice");
- pragma Assert (Vet (Position), "bad Position cursor in Splice");
+ if Before.Container /= null then
+ if Before.Container /= Container'Unchecked_Access then
+ raise Program_Error with
+ "Before cursor designates wrong container";
+ end if;
- if Before.Container /= null
- and then Before.Container /= Target'Unchecked_Access
- then
- raise Program_Error;
+ if Before.Node = null
+ or else Before.Node.Element = null
+ then
+ raise Program_Error with
+ "Before cursor has no element";
+ end if;
+
+ pragma Assert (Vet (Before), "bad Before cursor in Splice");
end if;
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Position cursor has no element";
end if;
- if Position.Container /= Target'Unrestricted_Access then
- raise Program_Error;
+ if Position.Node.Element = null then
+ raise Program_Error with "Position cursor has no element";
end if;
+ if Position.Container /= Container'Unrestricted_Access then
+ raise Program_Error with
+ "Position cursor designates wrong container";
+ end if;
+
+ pragma Assert (Vet (Position), "bad Position cursor in Splice");
+
if Position.Node = Before.Node
or else Position.Node.Next = Before.Node
then
return;
end if;
- pragma Assert (Target.Length >= 2);
+ pragma Assert (Container.Length >= 2);
- if Target.Busy > 0 then
- raise Program_Error;
+ if Container.Busy > 0 then
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
end if;
if Before.Node = null then
- pragma Assert (Position.Node /= Target.Last);
+ pragma Assert (Position.Node /= Container.Last);
- if Position.Node = Target.First then
- Target.First := Position.Node.Next;
- Target.First.Prev := null;
+ if Position.Node = Container.First then
+ Container.First := Position.Node.Next;
+ Container.First.Prev := null;
else
Position.Node.Prev.Next := Position.Node.Next;
Position.Node.Next.Prev := Position.Node.Prev;
end if;
- Target.Last.Next := Position.Node;
- Position.Node.Prev := Target.Last;
+ Container.Last.Next := Position.Node;
+ Position.Node.Prev := Container.Last;
- Target.Last := Position.Node;
- Target.Last.Next := null;
+ Container.Last := Position.Node;
+ Container.Last.Next := null;
return;
end if;
- if Before.Node = Target.First then
- pragma Assert (Position.Node /= Target.First);
+ if Before.Node = Container.First then
+ pragma Assert (Position.Node /= Container.First);
- if Position.Node = Target.Last then
- Target.Last := Position.Node.Prev;
- Target.Last.Next := null;
+ if Position.Node = Container.Last then
+ Container.Last := Position.Node.Prev;
+ Container.Last.Next := null;
else
Position.Node.Prev.Next := Position.Node.Next;
Position.Node.Next.Prev := Position.Node.Prev;
end if;
- Target.First.Prev := Position.Node;
- Position.Node.Next := Target.First;
+ Container.First.Prev := Position.Node;
+ Position.Node.Next := Container.First;
- Target.First := Position.Node;
- Target.First.Prev := null;
+ Container.First := Position.Node;
+ Container.First.Prev := null;
return;
end if;
- if Position.Node = Target.First then
- Target.First := Position.Node.Next;
- Target.First.Prev := null;
+ if Position.Node = Container.First then
+ Container.First := Position.Node.Next;
+ Container.First.Prev := null;
- elsif Position.Node = Target.Last then
- Target.Last := Position.Node.Prev;
- Target.Last.Next := null;
+ elsif Position.Node = Container.Last then
+ Container.Last := Position.Node.Prev;
+ Container.Last.Next := null;
else
Position.Node.Prev.Next := Position.Node.Next;
Before.Node.Prev := Position.Node;
Position.Node.Next := Before.Node;
- pragma Assert (Target.First.Prev = null);
- pragma Assert (Target.Last.Next = null);
+ pragma Assert (Container.First.Prev = null);
+ pragma Assert (Container.Last.Next = null);
end Splice;
procedure Splice
return;
end if;
- pragma Assert (Vet (Before), "bad Before cursor in Splice");
- pragma Assert (Vet (Position), "bad Position cursor in Splice");
+ if Before.Container /= null then
+ if Before.Container /= Target'Unrestricted_Access then
+ raise Program_Error with
+ "Before cursor designates wrong container";
+ end if;
- if Before.Container /= null
- and then Before.Container /= Target'Unrestricted_Access
- then
- raise Program_Error;
+ if Before.Node = null
+ or else Before.Node.Element = null
+ then
+ raise Program_Error with
+ "Before cursor has no element";
+ end if;
+
+ pragma Assert (Vet (Before), "bad Before cursor in Splice");
end if;
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Position cursor has no element";
+ end if;
+
+ if Position.Node.Element = null then
+ raise Program_Error with
+ "Position cursor has no element";
end if;
if Position.Container /= Source'Unrestricted_Access then
- raise Program_Error;
+ raise Program_Error with
+ "Position cursor designates wrong container";
end if;
+ pragma Assert (Vet (Position), "bad Position cursor in Splice");
+
if Target.Length = Count_Type'Last then
- raise Constraint_Error;
+ raise Constraint_Error with "Target is full";
end if;
- if Target.Busy > 0
- or else Source.Busy > 0
- then
- raise Program_Error;
+ if Target.Busy > 0 then
+ raise Program_Error with
+ "attempt to tamper with elements of Target (list is busy)";
+ end if;
+
+ if Source.Busy > 0 then
+ raise Program_Error with
+ "attempt to tamper with elements of Source (list is busy)";
end if;
if Position.Node = Source.First then
-- Swap --
----------
- procedure Swap (I, J : Cursor) is
+ procedure Swap
+ (Container : in out List;
+ I, J : Cursor)
+ is
begin
- pragma Assert (Vet (I), "bad I cursor in Swap");
- pragma Assert (Vet (J), "bad J cursor in Swap");
+ if I.Node = null then
+ raise Constraint_Error with "I cursor has no element";
+ end if;
- if I.Node = null
- or else J.Node = null
- then
- raise Constraint_Error;
+ if J.Node = null then
+ raise Constraint_Error with "J cursor has no element";
+ end if;
+
+ if I.Container /= Container'Unchecked_Access then
+ raise Program_Error with "I cursor designates wrong container";
end if;
- if I.Container /= J.Container then
- raise Program_Error;
+ if J.Container /= Container'Unchecked_Access then
+ raise Program_Error with "J cursor designates wrong container";
end if;
if I.Node = J.Node then
return;
end if;
- if I.Container.Lock > 0 then
- raise Program_Error;
+ if Container.Lock > 0 then
+ raise Program_Error with
+ "attempt to tamper with cursors (list is locked)";
end if;
+ pragma Assert (Vet (I), "bad I cursor in Swap");
+ pragma Assert (Vet (J), "bad J cursor in Swap");
+
declare
EI_Copy : constant Element_Access := I.Node.Element;
+
begin
I.Node.Element := J.Node.Element;
J.Node.Element := EI_Copy;
I, J : Cursor)
is
begin
- pragma Assert (Vet (I), "bad I cursor in Swap_Links");
- pragma Assert (Vet (J), "bad J cursor in Swap_Links");
+ if I.Node = null then
+ raise Constraint_Error with "I cursor has no element";
+ end if;
- if I.Node = null
- or else J.Node = null
- then
- raise Constraint_Error;
+ if J.Node = null then
+ raise Constraint_Error with "J cursor has no element";
end if;
- if I.Container /= Container'Unrestricted_Access
- or else I.Container /= J.Container
- then
- raise Program_Error;
+ if I.Container /= Container'Unrestricted_Access then
+ raise Program_Error with "I cursor designates wrong container";
+ end if;
+
+ if J.Container /= Container'Unrestricted_Access then
+ raise Program_Error with "J cursor designates wrong container";
end if;
if I.Node = J.Node then
end if;
if Container.Busy > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with elements (list is busy)";
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);
else
declare
J_Next : constant Cursor := Next (J);
+
begin
if J_Next = I then
Splice (Container, Before => J, Position => I);
--------------------
procedure Update_Element
- (Position : Cursor;
- Process : not null access procedure (Element : in out Element_Type))
+ (Container : in out List;
+ Position : Cursor;
+ Process : not null access procedure (Element : in out Element_Type))
is
begin
- pragma Assert (Vet (Position), "bad cursor in Update_Element");
-
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Position cursor has no element";
+ end if;
+
+ if Position.Node.Element = null then
+ raise Program_Error with
+ "Position cursor has no element";
end if;
+ if Position.Container /= Container'Unchecked_Access then
+ raise Program_Error with
+ "Position cursor designates wrong container";
+ end if;
+
+ pragma Assert (Vet (Position), "bad cursor in Update_Element");
+
declare
- C : List renames Position.Container.all'Unrestricted_Access.all;
- B : Natural renames C.Busy;
- L : Natural renames C.Lock;
+ B : Natural renames Container.Busy;
+ L : Natural renames Container.Lock;
begin
B := B + 1;
-----------
procedure Write
- (Stream : access Root_Stream_Type'Class;
+ (Stream : not null access Root_Stream_Type'Class;
Item : List)
is
Node : Node_Access := Item.First;
Count_Type'Base'Write (Stream, Item.Length);
while Node /= null loop
- Element_Type'Output (Stream, Node.Element.all); -- X.all
+ Element_Type'Output (Stream, Node.Element.all);
Node := Node.Next;
end loop;
end Write;
+ procedure Write
+ (Stream : not null access Root_Stream_Type'Class;
+ Item : Cursor)
+ is
+ begin
+ raise Program_Error with "attempt to stream list cursor";
+ end Write;
+
end Ada.Containers.Indefinite_Doubly_Linked_Lists;
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