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------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- A D A . C O N T A I N E R S . B O U N D E D _ H A S H E D _ S E T S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2004-2022, 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 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. --
-- --
-- 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. --
-- --
-- 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. --
------------------------------------------------------------------------------
with Ada.Containers.Hash_Tables.Generic_Bounded_Operations;
pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Operations);
with Ada.Containers.Hash_Tables.Generic_Bounded_Keys;
pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Keys);
with Ada.Containers.Helpers; use Ada.Containers.Helpers;
with Ada.Containers.Prime_Numbers; use Ada.Containers.Prime_Numbers;
with System; use type System.Address;
with System.Put_Images;
package body Ada.Containers.Bounded_Hashed_Sets with
SPARK_Mode => Off
is
use Ada.Finalization;
pragma Warnings (Off, "variable ""Busy*"" is not referenced");
pragma Warnings (Off, "variable ""Lock*"" is not referenced");
-- See comment in Ada.Containers.Helpers
-----------------------
-- Local Subprograms --
-----------------------
function Equivalent_Keys
(Key : Element_Type;
Node : Node_Type) return Boolean;
pragma Inline (Equivalent_Keys);
function Hash_Node (Node : Node_Type) return Hash_Type;
pragma Inline (Hash_Node);
procedure Insert
(Container : in out Set;
New_Item : Element_Type;
Node : out Count_Type;
Inserted : out Boolean);
function Is_In (HT : Set; Key : Node_Type) return Boolean;
pragma Inline (Is_In);
procedure Set_Element (Node : in out Node_Type; Item : Element_Type);
pragma Inline (Set_Element);
function Next (Node : Node_Type) return Count_Type;
pragma Inline (Next);
procedure Set_Next (Node : in out Node_Type; Next : Count_Type);
pragma Inline (Set_Next);
function Vet (Position : Cursor) return Boolean;
--------------------------
-- Local Instantiations --
--------------------------
package HT_Ops is new Hash_Tables.Generic_Bounded_Operations
(HT_Types => HT_Types,
Hash_Node => Hash_Node,
Next => Next,
Set_Next => Set_Next);
package Element_Keys is new Hash_Tables.Generic_Bounded_Keys
(HT_Types => HT_Types,
Next => Next,
Set_Next => Set_Next,
Key_Type => Element_Type,
Hash => Hash,
Equivalent_Keys => Equivalent_Keys);
procedure Replace_Element is
new Element_Keys.Generic_Replace_Element (Hash_Node, Set_Element);
---------
-- "=" --
---------
function "=" (Left, Right : Set) return Boolean is
function Find_Equal_Key
(R_HT : Hash_Table_Type'Class;
L_Node : Node_Type) return Boolean;
pragma Inline (Find_Equal_Key);
function Is_Equal is
new HT_Ops.Generic_Equal (Find_Equal_Key);
--------------------
-- Find_Equal_Key --
--------------------
function Find_Equal_Key
(R_HT : Hash_Table_Type'Class;
L_Node : Node_Type) return Boolean
is
R_Index : constant Hash_Type :=
Element_Keys.Index (R_HT, L_Node.Element);
R_Node : Count_Type := R_HT.Buckets (R_Index);
begin
loop
if R_Node = 0 then
return False;
end if;
if L_Node.Element = R_HT.Nodes (R_Node).Element then
return True;
end if;
R_Node := Next (R_HT.Nodes (R_Node));
end loop;
end Find_Equal_Key;
-- Start of processing for "="
begin
return Is_Equal (Left, Right);
end "=";
------------
-- Assign --
------------
procedure Assign (Target : in out Set; Source : Set) is
procedure Insert_Element (Source_Node : Count_Type);
procedure Insert_Elements is
new HT_Ops.Generic_Iteration (Insert_Element);
--------------------
-- Insert_Element --
--------------------
procedure Insert_Element (Source_Node : Count_Type) is
N : Node_Type renames Source.Nodes (Source_Node);
X : Count_Type;
B : Boolean;
begin
Insert (Target, N.Element, X, B);
pragma Assert (B);
end Insert_Element;
-- Start of processing for Assign
begin
if Target'Address = Source'Address then
return;
end if;
if Checks and then Target.Capacity < Source.Length then
raise Capacity_Error
with "Target capacity is less than Source length";
end if;
HT_Ops.Clear (Target);
Insert_Elements (Source);
end Assign;
--------------
-- Capacity --
--------------
function Capacity (Container : Set) return Count_Type is
begin
return Container.Capacity;
end Capacity;
-----------
-- Clear --
-----------
procedure Clear (Container : in out Set) is
begin
HT_Ops.Clear (Container);
end Clear;
------------------------
-- Constant_Reference --
------------------------
function Constant_Reference
(Container : aliased Set;
Position : Cursor) return Constant_Reference_Type
is
begin
if Checks and then Position.Container = null then
raise Constraint_Error with "Position cursor has no element";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor designates wrong container";
end if;
pragma Assert (Vet (Position), "bad cursor in Constant_Reference");
declare
N : Node_Type renames Container.Nodes (Position.Node);
TC : constant Tamper_Counts_Access :=
Container.TC'Unrestricted_Access;
begin
return R : constant Constant_Reference_Type :=
(Element => N.Element'Unchecked_Access,
Control => (Controlled with TC))
do
Busy (TC.all);
end return;
end;
end Constant_Reference;
--------------
-- Contains --
--------------
function Contains (Container : Set; Item : Element_Type) return Boolean is
begin
return Find (Container, Item) /= No_Element;
end Contains;
----------
-- Copy --
----------
function Copy
(Source : Set;
Capacity : Count_Type := 0;
Modulus : Hash_Type := 0) return Set
is
C : constant Count_Type :=
(if Capacity = 0 then Source.Length
else Capacity);
M : Hash_Type;
begin
if Checks and then C < Source.Length then
raise Capacity_Error with "Capacity too small";
end if;
if Modulus = 0 then
M := Default_Modulus (C);
else
M := Modulus;
end if;
return Target : Set (Capacity => C, Modulus => M) do
Assign (Target => Target, Source => Source);
end return;
end Copy;
---------------------
-- Default_Modulus --
---------------------
function Default_Modulus (Capacity : Count_Type) return Hash_Type is
begin
return To_Prime (Capacity);
end Default_Modulus;
------------
-- Delete --
------------
procedure Delete
(Container : in out Set;
Item : Element_Type)
is
X : Count_Type;
begin
Element_Keys.Delete_Key_Sans_Free (Container, Item, X);
if Checks and then X = 0 then
raise Constraint_Error with "attempt to delete element not in set";
end if;
HT_Ops.Free (Container, X);
end Delete;
procedure Delete
(Container : in out Set;
Position : in out Cursor)
is
begin
TC_Check (Container.TC);
if Checks and then Position.Node = 0 then
raise Constraint_Error with "Position cursor equals No_Element";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with "Position cursor designates wrong set";
end if;
pragma Assert (Vet (Position), "bad cursor in Delete");
HT_Ops.Delete_Node_Sans_Free (Container, Position.Node);
HT_Ops.Free (Container, Position.Node);
Position := No_Element;
end Delete;
----------------
-- Difference --
----------------
procedure Difference
(Target : in out Set;
Source : Set)
is
Tgt_Node, Src_Node : Count_Type;
Src : Set renames Source'Unrestricted_Access.all;
TN : Nodes_Type renames Target.Nodes;
SN : Nodes_Type renames Source.Nodes;
begin
if Target'Address = Source'Address then
HT_Ops.Clear (Target);
return;
end if;
if Source.Length = 0 then
return;
end if;
TC_Check (Target.TC);
if Source.Length < Target.Length then
Src_Node := HT_Ops.First (Source);
while Src_Node /= 0 loop
Tgt_Node := Element_Keys.Find (Target, SN (Src_Node).Element);
if Tgt_Node /= 0 then
HT_Ops.Delete_Node_Sans_Free (Target, Tgt_Node);
HT_Ops.Free (Target, Tgt_Node);
end if;
Src_Node := HT_Ops.Next (Src, Src_Node);
end loop;
else
Tgt_Node := HT_Ops.First (Target);
while Tgt_Node /= 0 loop
if Is_In (Source, TN (Tgt_Node)) then
declare
X : constant Count_Type := Tgt_Node;
begin
Tgt_Node := HT_Ops.Next (Target, Tgt_Node);
HT_Ops.Delete_Node_Sans_Free (Target, X);
HT_Ops.Free (Target, X);
end;
else
Tgt_Node := HT_Ops.Next (Target, Tgt_Node);
end if;
end loop;
end if;
end Difference;
function Difference (Left, Right : Set) return Set is
begin
if Left'Address = Right'Address then
return Empty_Set;
end if;
if Left.Length = 0 then
return Empty_Set;
end if;
if Right.Length = 0 then
return Left;
end if;
return Result : Set (Left.Length, To_Prime (Left.Length)) do
Iterate_Left : declare
procedure Process (L_Node : Count_Type);
procedure Iterate is
new HT_Ops.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (L_Node : Count_Type) is
N : Node_Type renames Left.Nodes (L_Node);
X : Count_Type;
B : Boolean;
begin
if not Is_In (Right, N) then
Insert (Result, N.Element, X, B); -- optimize this ???
pragma Assert (B);
pragma Assert (X > 0);
end if;
end Process;
-- Start of processing for Iterate_Left
begin
Iterate (Left);
end Iterate_Left;
end return;
end Difference;
-------------
-- Element --
-------------
function Element (Position : Cursor) return Element_Type is
begin
if Checks and then Position.Node = 0 then
raise Constraint_Error with "Position cursor equals No_Element";
end if;
pragma Assert (Vet (Position), "bad cursor in function Element");
declare
S : Set renames Position.Container.all;
N : Node_Type renames S.Nodes (Position.Node);
begin
return N.Element;
end;
end Element;
-----------
-- Empty --
-----------
function Empty (Capacity : Count_Type := 10) return Set is
begin
return Result : Set (Capacity, 0) do
Reserve_Capacity (Result, Capacity);
end return;
end Empty;
---------------------
-- Equivalent_Sets --
---------------------
function Equivalent_Sets (Left, Right : Set) return Boolean is
function Find_Equivalent_Key
(R_HT : Hash_Table_Type'Class;
L_Node : Node_Type) return Boolean;
pragma Inline (Find_Equivalent_Key);
function Is_Equivalent is
new HT_Ops.Generic_Equal (Find_Equivalent_Key);
-------------------------
-- Find_Equivalent_Key --
-------------------------
function Find_Equivalent_Key
(R_HT : Hash_Table_Type'Class;
L_Node : Node_Type) return Boolean
is
R_Index : constant Hash_Type :=
Element_Keys.Index (R_HT, L_Node.Element);
R_Node : Count_Type := R_HT.Buckets (R_Index);
RN : Nodes_Type renames R_HT.Nodes;
begin
loop
if R_Node = 0 then
return False;
end if;
if Equivalent_Elements (L_Node.Element, RN (R_Node).Element) then
return True;
end if;
R_Node := Next (R_HT.Nodes (R_Node));
end loop;
end Find_Equivalent_Key;
-- Start of processing for Equivalent_Sets
begin
return Is_Equivalent (Left, Right);
end Equivalent_Sets;
-------------------------
-- Equivalent_Elements --
-------------------------
function Equivalent_Elements (Left, Right : Cursor)
return Boolean is
begin
if Checks and then Left.Node = 0 then
raise Constraint_Error with
"Left cursor of Equivalent_Elements equals No_Element";
end if;
if Checks and then Right.Node = 0 then
raise Constraint_Error with
"Right cursor of Equivalent_Elements equals No_Element";
end if;
pragma Assert (Vet (Left), "bad Left cursor in Equivalent_Elements");
pragma Assert (Vet (Right), "bad Right cursor in Equivalent_Elements");
-- AI05-0022 requires that a container implementation detect element
-- tampering by a generic actual subprogram. However, the following case
-- falls outside the scope of that AI. Randy Brukardt explained on the
-- ARG list on 2013/02/07 that:
-- (Begin Quote):
-- But for an operation like "<" [the ordered set analog of
-- Equivalent_Elements], there is no need to "dereference" a cursor
-- after the call to the generic formal parameter function, so nothing
-- bad could happen if tampering is undetected. And the operation can
-- safely return a result without a problem even if an element is
-- deleted from the container.
-- (End Quote).
declare
LN : Node_Type renames Left.Container.Nodes (Left.Node);
RN : Node_Type renames Right.Container.Nodes (Right.Node);
begin
return Equivalent_Elements (LN.Element, RN.Element);
end;
end Equivalent_Elements;
function Equivalent_Elements
(Left : Cursor;
Right : Element_Type) return Boolean
is
begin
if Checks and then Left.Node = 0 then
raise Constraint_Error with
"Left cursor of Equivalent_Elements equals No_Element";
end if;
pragma Assert (Vet (Left), "Left cursor in Equivalent_Elements is bad");
declare
LN : Node_Type renames Left.Container.Nodes (Left.Node);
begin
return Equivalent_Elements (LN.Element, Right);
end;
end Equivalent_Elements;
function Equivalent_Elements
(Left : Element_Type;
Right : Cursor) return Boolean
is
begin
if Checks and then Right.Node = 0 then
raise Constraint_Error with
"Right cursor of Equivalent_Elements equals No_Element";
end if;
pragma Assert
(Vet (Right),
"Right cursor of Equivalent_Elements is bad");
declare
RN : Node_Type renames Right.Container.Nodes (Right.Node);
begin
return Equivalent_Elements (Left, RN.Element);
end;
end Equivalent_Elements;
---------------------
-- Equivalent_Keys --
---------------------
function Equivalent_Keys
(Key : Element_Type;
Node : Node_Type) return Boolean
is
begin
return Equivalent_Elements (Key, Node.Element);
end Equivalent_Keys;
-------------
-- Exclude --
-------------
procedure Exclude
(Container : in out Set;
Item : Element_Type)
is
X : Count_Type;
begin
Element_Keys.Delete_Key_Sans_Free (Container, Item, X);
HT_Ops.Free (Container, X);
end Exclude;
--------------
-- Finalize --
--------------
procedure Finalize (Object : in out Iterator) is
begin
if Object.Container /= null then
Unbusy (Object.Container.TC);
end if;
end Finalize;
----------
-- Find --
----------
function Find
(Container : Set;
Item : Element_Type) return Cursor
is
Node : constant Count_Type :=
Element_Keys.Find (Container'Unrestricted_Access.all, Item);
begin
return (if Node = 0 then No_Element
else Cursor'(Container'Unrestricted_Access, Node));
end Find;
-----------
-- First --
-----------
function First (Container : Set) return Cursor is
Node : constant Count_Type := HT_Ops.First (Container);
begin
return (if Node = 0 then No_Element
else Cursor'(Container'Unrestricted_Access, Node));
end First;
overriding function First (Object : Iterator) return Cursor is
begin
return Object.Container.First;
end First;
------------------------
-- Get_Element_Access --
------------------------
function Get_Element_Access
(Position : Cursor) return not null Element_Access is
begin
return Position.Container.Nodes (Position.Node).Element'Access;
end Get_Element_Access;
-----------------
-- Has_Element --
-----------------
function Has_Element (Position : Cursor) return Boolean is
begin
pragma Assert (Vet (Position), "bad cursor in Has_Element");
return Position.Node /= 0;
end Has_Element;
---------------
-- Hash_Node --
---------------
function Hash_Node (Node : Node_Type) return Hash_Type is
begin
return Hash (Node.Element);
end Hash_Node;
-------------
-- Include --
-------------
procedure Include
(Container : in out Set;
New_Item : Element_Type)
is
Position : Cursor;
Inserted : Boolean;
begin
Insert (Container, New_Item, Position, Inserted);
if not Inserted then
TE_Check (Container.TC);
Container.Nodes (Position.Node).Element := New_Item;
end if;
end Include;
------------
-- Insert --
------------
procedure Insert
(Container : in out Set;
New_Item : Element_Type;
Position : out Cursor;
Inserted : out Boolean)
is
begin
Insert (Container, New_Item, Position.Node, Inserted);
Position.Container := Container'Unchecked_Access;
end Insert;
procedure Insert
(Container : in out Set;
New_Item : Element_Type)
is
Position : Cursor;
Inserted : Boolean;
begin
Insert (Container, New_Item, Position, Inserted);
if Checks and then not Inserted then
raise Constraint_Error with
"attempt to insert element already in set";
end if;
end Insert;
procedure Insert
(Container : in out Set;
New_Item : Element_Type;
Node : out Count_Type;
Inserted : out Boolean)
is
procedure Allocate_Set_Element (Node : in out Node_Type);
pragma Inline (Allocate_Set_Element);
function New_Node return Count_Type;
pragma Inline (New_Node);
procedure Local_Insert is
new Element_Keys.Generic_Conditional_Insert (New_Node);
procedure Allocate is
new HT_Ops.Generic_Allocate (Allocate_Set_Element);
---------------------------
-- Allocate_Set_Element --
---------------------------
procedure Allocate_Set_Element (Node : in out Node_Type) is
begin
Node.Element := New_Item;
end Allocate_Set_Element;
--------------
-- New_Node --
--------------
function New_Node return Count_Type is
Result : Count_Type;
begin
Allocate (Container, Result);
return Result;
end New_Node;
-- Start of processing for Insert
begin
-- The buckets array length is specified by the user as a discriminant
-- of the container type, so it is possible for the buckets array to
-- have a length of zero. We must check for this case specifically, in
-- order to prevent divide-by-zero errors later, when we compute the
-- buckets array index value for an element, given its hash value.
if Checks and then Container.Buckets'Length = 0 then
raise Capacity_Error with "No capacity for insertion";
end if;
Local_Insert (Container, New_Item, Node, Inserted);
end Insert;
------------------
-- Intersection --
------------------
procedure Intersection
(Target : in out Set;
Source : Set)
is
Tgt_Node : Count_Type;
TN : Nodes_Type renames Target.Nodes;
begin
if Target'Address = Source'Address then
return;
end if;
if Source.Length = 0 then
HT_Ops.Clear (Target);
return;
end if;
TC_Check (Target.TC);
Tgt_Node := HT_Ops.First (Target);
while Tgt_Node /= 0 loop
if Is_In (Source, TN (Tgt_Node)) then
Tgt_Node := HT_Ops.Next (Target, Tgt_Node);
else
declare
X : constant Count_Type := Tgt_Node;
begin
Tgt_Node := HT_Ops.Next (Target, Tgt_Node);
HT_Ops.Delete_Node_Sans_Free (Target, X);
HT_Ops.Free (Target, X);
end;
end if;
end loop;
end Intersection;
function Intersection (Left, Right : Set) return Set is
C : Count_Type;
begin
if Left'Address = Right'Address then
return Left;
end if;
C := Count_Type'Min (Left.Length, Right.Length);
if C = 0 then
return Empty_Set;
end if;
return Result : Set (C, To_Prime (C)) do
Iterate_Left : declare
procedure Process (L_Node : Count_Type);
procedure Iterate is
new HT_Ops.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (L_Node : Count_Type) is
N : Node_Type renames Left.Nodes (L_Node);
X : Count_Type;
B : Boolean;
begin
if Is_In (Right, N) then
Insert (Result, N.Element, X, B); -- optimize ???
pragma Assert (B);
pragma Assert (X > 0);
end if;
end Process;
-- Start of processing for Iterate_Left
begin
Iterate (Left);
end Iterate_Left;
end return;
end Intersection;
--------------
-- Is_Empty --
--------------
function Is_Empty (Container : Set) return Boolean is
begin
return Container.Length = 0;
end Is_Empty;
-----------
-- Is_In --
-----------
function Is_In (HT : Set; Key : Node_Type) return Boolean is
begin
return Element_Keys.Find (HT'Unrestricted_Access.all, Key.Element) /= 0;
end Is_In;
---------------
-- Is_Subset --
---------------
function Is_Subset (Subset : Set; Of_Set : Set) return Boolean is
Subset_Node : Count_Type;
SN : Nodes_Type renames Subset.Nodes;
begin
if Subset'Address = Of_Set'Address then
return True;
end if;
if Subset.Length > Of_Set.Length then
return False;
end if;
Subset_Node := HT_Ops.First (Subset);
while Subset_Node /= 0 loop
if not Is_In (Of_Set, SN (Subset_Node)) then
return False;
end if;
Subset_Node := HT_Ops.Next
(Subset'Unrestricted_Access.all, Subset_Node);
end loop;
return True;
end Is_Subset;
-------------
-- Iterate --
-------------
procedure Iterate
(Container : Set;
Process : not null access procedure (Position : Cursor))
is
procedure Process_Node (Node : Count_Type);
pragma Inline (Process_Node);
procedure Iterate is
new HT_Ops.Generic_Iteration (Process_Node);
------------------
-- Process_Node --
------------------
procedure Process_Node (Node : Count_Type) is
begin
Process (Cursor'(Container'Unrestricted_Access, Node));
end Process_Node;
Busy : With_Busy (Container.TC'Unrestricted_Access);
-- Start of processing for Iterate
begin
Iterate (Container);
end Iterate;
function Iterate (Container : Set)
return Set_Iterator_Interfaces.Forward_Iterator'Class
is
begin
Busy (Container.TC'Unrestricted_Access.all);
return It : constant Iterator :=
Iterator'(Limited_Controlled with
Container => Container'Unrestricted_Access);
end Iterate;
------------
-- Length --
------------
function Length (Container : Set) return Count_Type is
begin
return Container.Length;
end Length;
----------
-- Move --
----------
procedure Move (Target : in out Set; Source : in out Set) is
begin
if Target'Address = Source'Address then
return;
end if;
TC_Check (Source.TC);
Target.Assign (Source);
Source.Clear;
end Move;
----------
-- Next --
----------
function Next (Node : Node_Type) return Count_Type is
begin
return Node.Next;
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
HT : Set renames Position.Container.all;
Node : constant Count_Type := HT_Ops.Next (HT, Position.Node);
begin
if Node = 0 then
return No_Element;
end if;
return Cursor'(Position.Container, Node);
end;
end Next;
procedure Next (Position : in out Cursor) is
begin
Position := Next (Position);
end Next;
function Next
(Object : Iterator;
Position : Cursor) return Cursor
is
begin
if Position.Container = null then
return No_Element;
end if;
if Checks and then Position.Container /= Object.Container then
raise Program_Error with
"Position cursor of Next designates wrong set";
end if;
return Next (Position);
end Next;
-------------
-- Overlap --
-------------
function Overlap (Left, Right : Set) return Boolean is
Left_Node : Count_Type;
begin
if Right.Length = 0 then
return False;
end if;
if Left'Address = Right'Address then
return True;
end if;
Left_Node := HT_Ops.First (Left);
while Left_Node /= 0 loop
if Is_In (Right, Left.Nodes (Left_Node)) then
return True;
end if;
Left_Node := HT_Ops.Next (Left'Unrestricted_Access.all, Left_Node);
end loop;
return False;
end Overlap;
----------------------
-- Pseudo_Reference --
----------------------
function Pseudo_Reference
(Container : aliased Set'Class) return Reference_Control_Type
is
TC : constant Tamper_Counts_Access :=
Container.TC'Unrestricted_Access;
begin
return R : constant Reference_Control_Type := (Controlled with TC) do
Busy (TC.all);
end return;
end Pseudo_Reference;
-------------------
-- Query_Element --
-------------------
procedure Query_Element
(Position : Cursor;
Process : not null access procedure (Element : Element_Type))
is
begin
if Checks and then Position.Node = 0 then
raise Constraint_Error with
"Position cursor of Query_Element equals No_Element";
end if;
pragma Assert (Vet (Position), "bad cursor in Query_Element");
declare
S : Set renames Position.Container.all;
Lock : With_Lock (S.TC'Unrestricted_Access);
begin
Process (S.Nodes (Position.Node).Element);
end;
end Query_Element;
---------------
-- Put_Image --
---------------
procedure Put_Image
(S : in out Ada.Strings.Text_Buffers.Root_Buffer_Type'Class; V : Set)
is
First_Time : Boolean := True;
use System.Put_Images;
begin
Array_Before (S);
for X of V loop
if First_Time then
First_Time := False;
else
Simple_Array_Between (S);
end if;
Element_Type'Put_Image (S, X);
end loop;
Array_After (S);
end Put_Image;
----------
-- Read --
----------
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Container : out Set)
is
function Read_Node (Stream : not null access Root_Stream_Type'Class)
return Count_Type;
procedure Read_Nodes is
new HT_Ops.Generic_Read (Read_Node);
---------------
-- Read_Node --
---------------
function Read_Node (Stream : not null access Root_Stream_Type'Class)
return Count_Type
is
procedure Read_Element (Node : in out Node_Type);
pragma Inline (Read_Element);
procedure Allocate is
new HT_Ops.Generic_Allocate (Read_Element);
procedure Read_Element (Node : in out Node_Type) is
begin
Element_Type'Read (Stream, Node.Element);
end Read_Element;
Node : Count_Type;
-- Start of processing for Read_Node
begin
Allocate (Container, Node);
return Node;
end Read_Node;
-- Start of processing for Read
begin
Read_Nodes (Stream, Container);
end Read;
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Item : out Cursor)
is
begin
raise Program_Error with "attempt to stream set cursor";
end Read;
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Item : out Constant_Reference_Type)
is
begin
raise Program_Error with "attempt to stream reference";
end Read;
-------------
-- Replace --
-------------
procedure Replace
(Container : in out Set;
New_Item : Element_Type)
is
Node : constant Count_Type := Element_Keys.Find (Container, New_Item);
begin
TE_Check (Container.TC);
if Checks and then Node = 0 then
raise Constraint_Error with
"attempt to replace element not in set";
end if;
Container.Nodes (Node).Element := New_Item;
end Replace;
procedure Replace_Element
(Container : in out Set;
Position : Cursor;
New_Item : Element_Type)
is
begin
if Checks and then Position.Node = 0 then
raise Constraint_Error with
"Position cursor equals No_Element";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor designates wrong set";
end if;
pragma Assert (Vet (Position), "bad cursor in Replace_Element");
Replace_Element (Container, Position.Node, New_Item);
end Replace_Element;
----------------------
-- Reserve_Capacity --
----------------------
procedure Reserve_Capacity
(Container : in out Set;
Capacity : Count_Type)
is
begin
if Checks and then Capacity > Container.Capacity then
raise Capacity_Error with "requested capacity is too large";
end if;
end Reserve_Capacity;
------------------
-- Set_Element --
------------------
procedure Set_Element (Node : in out Node_Type; Item : Element_Type) is
begin
Node.Element := Item;
end Set_Element;
--------------
-- Set_Next --
--------------
procedure Set_Next (Node : in out Node_Type; Next : Count_Type) is
begin
Node.Next := Next;
end Set_Next;
--------------------------
-- Symmetric_Difference --
--------------------------
procedure Symmetric_Difference
(Target : in out Set;
Source : Set)
is
procedure Process (Source_Node : Count_Type);
pragma Inline (Process);
procedure Iterate is
new HT_Ops.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (Source_Node : Count_Type) is
N : Node_Type renames Source.Nodes (Source_Node);
X : Count_Type;
B : Boolean;
begin
if Is_In (Target, N) then
Delete (Target, N.Element);
else
Insert (Target, N.Element, X, B);
pragma Assert (B);
end if;
end Process;
-- Start of processing for Symmetric_Difference
begin
if Target'Address = Source'Address then
HT_Ops.Clear (Target);
return;
end if;
if Target.Length = 0 then
Assign (Target => Target, Source => Source);
return;
end if;
TC_Check (Target.TC);
Iterate (Source);
end Symmetric_Difference;
function Symmetric_Difference (Left, Right : Set) return Set is
C : Count_Type;
begin
if Left'Address = Right'Address then
return Empty_Set;
end if;
if Right.Length = 0 then
return Left;
end if;
if Left.Length = 0 then
return Right;
end if;
C := Left.Length + Right.Length;
return Result : Set (C, To_Prime (C)) do
Iterate_Left : declare
procedure Process (L_Node : Count_Type);
procedure Iterate is
new HT_Ops.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (L_Node : Count_Type) is
N : Node_Type renames Left.Nodes (L_Node);
X : Count_Type;
B : Boolean;
begin
if not Is_In (Right, N) then
Insert (Result, N.Element, X, B);
pragma Assert (B);
end if;
end Process;
-- Start of processing for Iterate_Left
begin
Iterate (Left);
end Iterate_Left;
Iterate_Right : declare
procedure Process (R_Node : Count_Type);
procedure Iterate is
new HT_Ops.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (R_Node : Count_Type) is
N : Node_Type renames Right.Nodes (R_Node);
X : Count_Type;
B : Boolean;
begin
if not Is_In (Left, N) then
Insert (Result, N.Element, X, B);
pragma Assert (B);
end if;
end Process;
-- Start of processing for Iterate_Right
begin
Iterate (Right);
end Iterate_Right;
end return;
end Symmetric_Difference;
------------
-- To_Set --
------------
function To_Set (New_Item : Element_Type) return Set is
X : Count_Type;
B : Boolean;
begin
return Result : Set (1, 1) do
Insert (Result, New_Item, X, B);
pragma Assert (B);
end return;
end To_Set;
-----------
-- Union --
-----------
procedure Union
(Target : in out Set;
Source : Set)
is
procedure Process (Src_Node : Count_Type);
procedure Iterate is
new HT_Ops.Generic_Iteration (Process);
-------------
-- Process --
-------------
procedure Process (Src_Node : Count_Type) is
N : Node_Type renames Source.Nodes (Src_Node);
X : Count_Type;
B : Boolean;
begin
Insert (Target, N.Element, X, B);
end Process;
-- Start of processing for Union
begin
if Target'Address = Source'Address then
return;
end if;
TC_Check (Target.TC);
-- ??? why is this code commented out ???
-- declare
-- N : constant Count_Type := Target.Length + Source.Length;
-- begin
-- if N > HT_Ops.Capacity (Target.HT) then
-- HT_Ops.Reserve_Capacity (Target.HT, N);
-- end if;
-- end;
Iterate (Source);
end Union;
function Union (Left, Right : Set) return Set is
C : Count_Type;
begin
if Left'Address = Right'Address then
return Left;
end if;
if Right.Length = 0 then
return Left;
end if;
if Left.Length = 0 then
return Right;
end if;
C := Left.Length + Right.Length;
return Result : Set (C, To_Prime (C)) do
Assign (Target => Result, Source => Left);
Union (Target => Result, Source => Right);
end return;
end Union;
---------
-- 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
S : Set renames Position.Container.all;
N : Nodes_Type renames S.Nodes;
X : Count_Type;
begin
if S.Length = 0 then
return False;
end if;
if Position.Node > N'Last then
return False;
end if;
if N (Position.Node).Next = Position.Node then
return False;
end if;
X := S.Buckets (Element_Keys.Checked_Index
(S, N (Position.Node).Element));
for J in 1 .. S.Length loop
if X = Position.Node then
return True;
end if;
if X = 0 then
return False;
end if;
if X = N (X).Next then -- to prevent unnecessary looping
return False;
end if;
X := N (X).Next;
end loop;
return False;
end;
end Vet;
-----------
-- Write --
-----------
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Container : Set)
is
procedure Write_Node
(Stream : not null access Root_Stream_Type'Class;
Node : Node_Type);
pragma Inline (Write_Node);
procedure Write_Nodes is
new HT_Ops.Generic_Write (Write_Node);
----------------
-- Write_Node --
----------------
procedure Write_Node
(Stream : not null access Root_Stream_Type'Class;
Node : Node_Type)
is
begin
Element_Type'Write (Stream, Node.Element);
end Write_Node;
-- Start of processing for Write
begin
Write_Nodes (Stream, Container);
end Write;
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Item : Cursor)
is
begin
raise Program_Error with "attempt to stream set cursor";
end Write;
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Item : Constant_Reference_Type)
is
begin
raise Program_Error with "attempt to stream reference";
end Write;
package body Generic_Keys is
-----------------------
-- Local Subprograms --
-----------------------
function Equivalent_Key_Node
(Key : Key_Type;
Node : Node_Type) return Boolean;
pragma Inline (Equivalent_Key_Node);
--------------------------
-- Local Instantiations --
--------------------------
package Key_Keys is
new Hash_Tables.Generic_Bounded_Keys
(HT_Types => HT_Types,
Next => Next,
Set_Next => Set_Next,
Key_Type => Key_Type,
Hash => Hash,
Equivalent_Keys => Equivalent_Key_Node);
------------------------
-- Constant_Reference --
------------------------
function Constant_Reference
(Container : aliased Set;
Key : Key_Type) return Constant_Reference_Type
is
Position : constant Cursor := Find (Container, Key);
begin
if Checks and then Position = No_Element then
raise Constraint_Error with "key not in set";
end if;
return Constant_Reference (Container, Position);
end Constant_Reference;
--------------
-- Contains --
--------------
function Contains
(Container : Set;
Key : Key_Type) return Boolean
is
begin
return Find (Container, Key) /= No_Element;
end Contains;
------------
-- Delete --
------------
procedure Delete
(Container : in out Set;
Key : Key_Type)
is
X : Count_Type;
begin
Key_Keys.Delete_Key_Sans_Free (Container, Key, X);
if Checks and then X = 0 then
raise Constraint_Error with "attempt to delete key not in set";
end if;
HT_Ops.Free (Container, X);
end Delete;
-------------
-- Element --
-------------
function Element
(Container : Set;
Key : Key_Type) return Element_Type
is
Node : constant Count_Type :=
Key_Keys.Find (Container'Unrestricted_Access.all, Key);
begin
if Checks and then Node = 0 then
raise Constraint_Error with "key not in set";
end if;
return Container.Nodes (Node).Element;
end Element;
-------------------------
-- Equivalent_Key_Node --
-------------------------
function Equivalent_Key_Node
(Key : Key_Type;
Node : Node_Type) return Boolean
is
begin
return Equivalent_Keys (Key, Generic_Keys.Key (Node.Element));
end Equivalent_Key_Node;
-------------
-- Exclude --
-------------
procedure Exclude
(Container : in out Set;
Key : Key_Type)
is
X : Count_Type;
begin
Key_Keys.Delete_Key_Sans_Free (Container, Key, X);
HT_Ops.Free (Container, X);
end Exclude;
--------------
-- Finalize --
--------------
procedure Finalize (Control : in out Reference_Control_Type) is
begin
if Control.Container /= null then
Impl.Reference_Control_Type (Control).Finalize;
if Checks and then
Hash (Key (Element (Control.Old_Pos))) /= Control.Old_Hash
then
HT_Ops.Delete_Node_At_Index
(Control.Container.all, Control.Index, Control.Old_Pos.Node);
raise Program_Error with "key not preserved in reference";
end if;
Control.Container := null;
end if;
end Finalize;
----------
-- Find --
----------
function Find
(Container : Set;
Key : Key_Type) return Cursor
is
Node : constant Count_Type :=
Key_Keys.Find (Container'Unrestricted_Access.all, Key);
begin
return (if Node = 0 then No_Element
else Cursor'(Container'Unrestricted_Access, Node));
end Find;
---------
-- Key --
---------
function Key (Position : Cursor) return Key_Type is
begin
if Checks and then Position.Node = 0 then
raise Constraint_Error with
"Position cursor equals No_Element";
end if;
pragma Assert (Vet (Position), "bad cursor in function Key");
return Key (Position.Container.Nodes (Position.Node).Element);
end Key;
----------
-- Read --
----------
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Item : out Reference_Type)
is
begin
raise Program_Error with "attempt to stream reference";
end Read;
------------------------------
-- Reference_Preserving_Key --
------------------------------
function Reference_Preserving_Key
(Container : aliased in out Set;
Position : Cursor) return Reference_Type
is
begin
if Checks and then Position.Container = null then
raise Constraint_Error with "Position cursor has no element";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor designates wrong container";
end if;
pragma Assert
(Vet (Position),
"bad cursor in function Reference_Preserving_Key");
declare
N : Node_Type renames Container.Nodes (Position.Node);
begin
return R : constant Reference_Type :=
(Element => N.Element'Unrestricted_Access,
Control =>
(Controlled with
Container.TC'Unrestricted_Access,
Container'Unrestricted_Access,
Index => Key_Keys.Index (Container, Key (Position)),
Old_Pos => Position,
Old_Hash => Hash (Key (Position))))
do
Busy (Container.TC);
end return;
end;
end Reference_Preserving_Key;
function Reference_Preserving_Key
(Container : aliased in out Set;
Key : Key_Type) return Reference_Type
is
Position : constant Cursor := Find (Container, Key);
begin
if Checks and then Position = No_Element then
raise Constraint_Error with "key not in set";
end if;
return Reference_Preserving_Key (Container, Position);
end Reference_Preserving_Key;
-------------
-- Replace --
-------------
procedure Replace
(Container : in out Set;
Key : Key_Type;
New_Item : Element_Type)
is
Node : constant Count_Type := Key_Keys.Find (Container, Key);
begin
if Checks and then Node = 0 then
raise Constraint_Error with
"attempt to replace key not in set";
end if;
Replace_Element (Container, Node, New_Item);
end Replace;
-----------------------------------
-- Update_Element_Preserving_Key --
-----------------------------------
procedure Update_Element_Preserving_Key
(Container : in out Set;
Position : Cursor;
Process : not null access
procedure (Element : in out Element_Type))
is
Indx : Hash_Type;
N : Nodes_Type renames Container.Nodes;
begin
if Checks and then Position.Node = 0 then
raise Constraint_Error with
"Position cursor equals No_Element";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor designates wrong set";
end if;
-- ??? why is this code commented out ???
-- if HT.Buckets = null
-- or else HT.Buckets'Length = 0
-- or else HT.Length = 0
-- or else Position.Node.Next = Position.Node
-- then
-- raise Program_Error with
-- "Position cursor is bad (set is empty)";
-- end if;
pragma Assert
(Vet (Position),
"bad cursor in Update_Element_Preserving_Key");
-- Per AI05-0022, the container implementation is required to detect
-- element tampering by a generic actual subprogram.
declare
E : Element_Type renames N (Position.Node).Element;
K : constant Key_Type := Key (E);
Lock : With_Lock (Container.TC'Unrestricted_Access);
begin
-- Record bucket now, in case key is changed
Indx := HT_Ops.Index (Container.Buckets, N (Position.Node));
Process (E);
if Equivalent_Keys (K, Key (E)) then
return;
end if;
end;
-- Key was modified, so remove this node from set.
if Container.Buckets (Indx) = Position.Node then
Container.Buckets (Indx) := N (Position.Node).Next;
else
declare
Prev : Count_Type := Container.Buckets (Indx);
begin
while N (Prev).Next /= Position.Node loop
Prev := N (Prev).Next;
if Checks and then Prev = 0 then
raise Program_Error with
"Position cursor is bad (node not found)";
end if;
end loop;
N (Prev).Next := N (Position.Node).Next;
end;
end if;
Container.Length := Container.Length - 1;
HT_Ops.Free (Container, Position.Node);
raise Program_Error with "key was modified";
end Update_Element_Preserving_Key;
-----------
-- Write --
-----------
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Item : Reference_Type)
is
begin
raise Program_Error with "attempt to stream reference";
end Write;
end Generic_Keys;
end Ada.Containers.Bounded_Hashed_Sets;