-- --
-- B o d y --
-- --
--- Copyright (C) 2004-2005, Free Software Foundation, Inc. --
+-- Copyright (C) 2004-2006, 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 --
function "<" (Left, Right : Cursor) return Boolean is
begin
- if Left.Node = null
- or else Right.Node = null
- then
- raise Constraint_Error;
+ if Left.Node = null then
+ raise Constraint_Error with "Left cursor equals No_Element";
+ end if;
+
+ if Right.Node = null then
+ raise Constraint_Error with "Right cursor equals No_Element";
end if;
pragma Assert (Vet (Left.Container.Tree, Left.Node),
return Boolean is
begin
if Left.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Left cursor equals No_Element";
end if;
pragma Assert (Vet (Left.Container.Tree, Left.Node),
return Boolean is
begin
if Right.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Right cursor equals No_Element";
end if;
pragma Assert (Vet (Right.Container.Tree, Right.Node),
function ">" (Left, Right : Cursor) return Boolean is
begin
- if Left.Node = null
- or else Right.Node = null
- then
- raise Constraint_Error;
+ if Left.Node = null then
+ raise Constraint_Error with "Left cursor equals No_Element";
+ end if;
+
+ if Right.Node = null then
+ raise Constraint_Error with "Right cursor equals No_Element";
end if;
pragma Assert (Vet (Left.Container.Tree, Left.Node),
return Boolean is
begin
if Left.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Left cursor equals No_Element";
end if;
pragma Assert (Vet (Left.Container.Tree, Left.Node),
return Boolean is
begin
if Right.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Right cursor equals No_Element";
end if;
pragma Assert (Vet (Right.Container.Tree, Right.Node),
begin
if Node = Done then
- raise Constraint_Error;
+ raise Constraint_Error with
+ "attempt to delete element not in set";
end if;
loop
procedure Delete (Container : in out Set; Position : in out Cursor) is
begin
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Position cursor equals No_Element";
end if;
if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error;
+ raise Program_Error with "Position cursor designates wrong set";
end if;
pragma Assert (Vet (Container.Tree, Position.Node),
function Element (Position : Cursor) return Element_Type is
begin
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Position cursor equals No_Element";
end if;
pragma Assert (Vet (Position.Container.Tree, Position.Node),
function First_Element (Container : Set) return Element_Type is
begin
if Container.Tree.First = null then
- raise Constraint_Error;
+ raise Constraint_Error with "set is empty";
end if;
return Container.Tree.First.Element;
begin
if Node = Done then
- raise Constraint_Error;
+ raise Constraint_Error with "attempt to delete key not in set";
end if;
loop
Key_Keys.Find (Container.Tree, Key);
begin
if Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "key not in set";
end if;
return Node.Element;
function Key (Position : Cursor) return Key_Type is
begin
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with
+ "Position cursor equals No_Element";
end if;
pragma Assert (Vet (Position.Container.Tree, Position.Node),
B := B - 1;
end Reverse_Iterate;
- -----------------------------------
- -- Update_Element_Preserving_Key --
- -----------------------------------
+ --------------------
+ -- Update_Element --
+ --------------------
- procedure Update_Element_Preserving_Key
+ procedure Update_Element
(Container : in out Set;
Position : Cursor;
Process : not null access procedure (Element : in out Element_Type))
is
Tree : Tree_Type renames Container.Tree;
+ Node : constant Node_Access := Position.Node;
begin
- if Position.Node = null then
- raise Constraint_Error;
+ if Node = null then
+ raise Constraint_Error with
+ "Position cursor equals No_Element";
end if;
if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error;
+ raise Program_Error with
+ "Position cursor designates wrong set";
end if;
- pragma Assert (Vet (Container.Tree, Position.Node),
- "bad cursor in Update_Element_Preserving_Key");
+ pragma Assert (Vet (Tree, Node),
+ "bad cursor in Update_Element");
declare
- E : Element_Type renames Position.Node.Element;
+ E : Element_Type renames Node.Element;
K : constant Key_Type := Key (E);
B : Natural renames Tree.Busy;
end if;
end;
- declare
- X : Node_Access := Position.Node;
+ -- Delete_Node checks busy-bit
+
+ Tree_Operations.Delete_Node_Sans_Free (Tree, Node);
+
+ Insert_New_Item : declare
+ function New_Node return Node_Access;
+ pragma Inline (New_Node);
+
+ procedure Insert_Post is
+ new Element_Keys.Generic_Insert_Post (New_Node);
+
+ procedure Unconditional_Insert is
+ new Element_Keys.Generic_Unconditional_Insert (Insert_Post);
+
+ --------------
+ -- New_Node --
+ --------------
+
+ function New_Node return Node_Access is
+ begin
+ Node.Color := Red_Black_Trees.Red;
+ Node.Parent := null;
+ Node.Left := null;
+ Node.Right := null;
+
+ return Node;
+ end New_Node;
+
+ Result : Node_Access;
+
+ -- Start of processing for Insert_New_Item
+
begin
- Tree_Operations.Delete_Node_Sans_Free (Tree, X);
- Free (X);
- end;
+ Unconditional_Insert
+ (Tree => Tree,
+ Key => Node.Element,
+ Node => Result);
- raise Program_Error;
- end Update_Element_Preserving_Key;
+ pragma Assert (Result = Node);
+ end Insert_New_Item;
+ end Update_Element;
end Generic_Keys;
-- Insert --
------------
- procedure Insert (Container : in out Set; New_Item : Element_Type) is
+ procedure Insert (Container : in out Set; New_Item : Element_Type) is
Position : Cursor;
begin
Insert (Container, New_Item, Position);
Position : out Cursor)
is
begin
- Insert_Sans_Hint
- (Container.Tree,
- New_Item,
- Position.Node);
-
+ Insert_Sans_Hint (Container.Tree, New_Item, Position.Node);
Position.Container := Container'Unrestricted_Access;
end Insert;
procedure Insert_Post is
new Element_Keys.Generic_Insert_Post (New_Node);
- procedure Unconditional_Insert_Sans_Hint is
+ procedure Unconditional_Insert is
new Element_Keys.Generic_Unconditional_Insert (Insert_Post);
--------------
-- Start of processing for Insert_Sans_Hint
begin
- Unconditional_Insert_Sans_Hint
- (Tree,
- New_Item,
- Node);
+ Unconditional_Insert (Tree, New_Item, Node);
end Insert_Sans_Hint;
----------------------
function Last_Element (Container : Set) return Element_Type is
begin
if Container.Tree.Last = null then
- raise Constraint_Error;
+ raise Constraint_Error with "set is empty";
end if;
return Container.Tree.Last.Element;
is
begin
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with "Position cursor equals No_Element";
end if;
pragma Assert (Vet (Position.Container.Tree, Position.Node),
Item : out Cursor)
is
begin
- raise Program_Error;
+ raise Program_Error with "attempt to stream set cursor";
end Read;
---------------------
null;
else
if Tree.Lock > 0 then
- raise Program_Error;
+ raise Program_Error with
+ "attempt to tamper with cursors (set is locked)";
end if;
Node.Element := Item;
is
begin
if Position.Node = null then
- raise Constraint_Error;
+ raise Constraint_Error with
+ "Position cursor equals No_Element";
end if;
if Position.Container /= Container'Unrestricted_Access then
- raise Program_Error;
+ raise Program_Error with
+ "Position cursor designates wrong set";
end if;
pragma Assert (Vet (Container.Tree, Position.Node),
Item : Cursor)
is
begin
- raise Program_Error;
+ raise Program_Error with "attempt to stream set cursor";
end Write;
end Ada.Containers.Ordered_Multisets;
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