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------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- ADA.CONTAINERS.INDEFINITE_HASHED_MAPS --
-- --
-- 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_Operations;
pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Operations);
with Ada.Containers.Hash_Tables.Generic_Keys;
pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Keys);
with Ada.Containers.Helpers; use Ada.Containers.Helpers;
with Ada.Unchecked_Deallocation;
with System; use type System.Address;
with System.Put_Images;
package body Ada.Containers.Indefinite_Hashed_Maps with
SPARK_Mode => Off
is
pragma Warnings (Off, "variable ""Busy*"" is not referenced");
pragma Warnings (Off, "variable ""Lock*"" is not referenced");
-- See comment in Ada.Containers.Helpers
procedure Free_Key is
new Ada.Unchecked_Deallocation (Key_Type, Key_Access);
procedure Free_Element is
new Ada.Unchecked_Deallocation (Element_Type, Element_Access);
-----------------------
-- Local Subprograms --
-----------------------
function Copy_Node (Node : Node_Access) return Node_Access;
pragma Inline (Copy_Node);
function Equivalent_Key_Node
(Key : Key_Type;
Node : Node_Access) return Boolean;
pragma Inline (Equivalent_Key_Node);
function Find_Equal_Key
(R_HT : Hash_Table_Type;
L_Node : Node_Access) return Boolean;
procedure Free (X : in out Node_Access);
-- pragma Inline (Free);
function Hash_Node (Node : Node_Access) return Hash_Type;
pragma Inline (Hash_Node);
function Next (Node : Node_Access) return Node_Access;
pragma Inline (Next);
function Read_Node
(Stream : not null access Root_Stream_Type'Class) return Node_Access;
procedure Set_Next (Node : Node_Access; Next : Node_Access);
pragma Inline (Set_Next);
function Vet (Position : Cursor) return Boolean;
procedure Write_Node
(Stream : not null access Root_Stream_Type'Class;
Node : Node_Access);
--------------------------
-- Local Instantiations --
--------------------------
package HT_Ops is new Ada.Containers.Hash_Tables.Generic_Operations
(HT_Types => HT_Types,
Hash_Node => Hash_Node,
Next => Next,
Set_Next => Set_Next,
Copy_Node => Copy_Node,
Free => Free);
package Key_Ops is new Hash_Tables.Generic_Keys
(HT_Types => HT_Types,
Next => Next,
Set_Next => Set_Next,
Key_Type => Key_Type,
Hash => Hash,
Equivalent_Keys => Equivalent_Key_Node);
---------
-- "=" --
---------
function Is_Equal is new HT_Ops.Generic_Equal (Find_Equal_Key);
overriding function "=" (Left, Right : Map) return Boolean is
begin
return Is_Equal (Left.HT, Right.HT);
end "=";
------------
-- Adjust --
------------
procedure Adjust (Container : in out Map) is
begin
HT_Ops.Adjust (Container.HT);
end Adjust;
------------
-- Assign --
------------
procedure Assign (Target : in out Map; Source : Map) is
procedure Insert_Item (Node : Node_Access);
pragma Inline (Insert_Item);
procedure Insert_Items is new HT_Ops.Generic_Iteration (Insert_Item);
-----------------
-- Insert_Item --
-----------------
procedure Insert_Item (Node : Node_Access) is
begin
Target.Insert (Key => Node.Key.all, New_Item => Node.Element.all);
end Insert_Item;
-- Start of processing for Assign
begin
if Target'Address = Source'Address then
return;
end if;
Target.Clear;
if Target.Capacity < Source.Length then
Target.Reserve_Capacity (Source.Length);
end if;
Insert_Items (Source.HT);
end Assign;
--------------
-- Capacity --
--------------
function Capacity (Container : Map) return Count_Type is
begin
return HT_Ops.Capacity (Container.HT);
end Capacity;
-----------
-- Clear --
-----------
procedure Clear (Container : in out Map) is
begin
HT_Ops.Clear (Container.HT);
end Clear;
------------------------
-- Constant_Reference --
------------------------
function Constant_Reference
(Container : aliased Map;
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 map";
end if;
if Checks and then Position.Node.Element = null then
raise Program_Error with
"Position cursor has no element";
end if;
pragma Assert
(Vet (Position),
"Position cursor in Constant_Reference is bad");
declare
M : Map renames Position.Container.all;
HT : Hash_Table_Type renames M.HT'Unrestricted_Access.all;
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Constant_Reference_Type :=
(Element => Position.Node.Element.all'Access,
Control => (Controlled with TC))
do
Busy (TC.all);
end return;
end;
end Constant_Reference;
function Constant_Reference
(Container : aliased Map;
Key : Key_Type) return Constant_Reference_Type
is
HT : Hash_Table_Type renames Container'Unrestricted_Access.HT;
Node : constant Node_Access := Key_Ops.Find (HT, Key);
begin
if Checks and then Node = null then
raise Constraint_Error with "key not in map";
end if;
if Checks and then Node.Element = null then
raise Program_Error with "key has no element";
end if;
declare
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Constant_Reference_Type :=
(Element => Node.Element.all'Access,
Control => (Controlled with TC))
do
Busy (TC.all);
end return;
end;
end Constant_Reference;
--------------
-- Contains --
--------------
function Contains (Container : Map; Key : Key_Type) return Boolean is
begin
return Find (Container, Key) /= No_Element;
end Contains;
----------
-- Copy --
----------
function Copy
(Source : Map;
Capacity : Count_Type := 0) return Map
is
C : Count_Type;
begin
if Capacity < Source.Length then
if Checks and then Capacity /= 0 then
raise Capacity_Error
with "Requested capacity is less than Source length";
end if;
C := Source.Length;
else
C := Capacity;
end if;
return Target : Map do
Target.Reserve_Capacity (C);
Target.Assign (Source);
end return;
end Copy;
---------------
-- Copy_Node --
---------------
function Copy_Node (Node : Node_Access) return Node_Access is
K : Key_Access := new Key_Type'(Node.Key.all);
E : Element_Access;
begin
E := new Element_Type'(Node.Element.all);
return new Node_Type'(K, E, null);
exception
when others =>
Free_Key (K);
Free_Element (E);
raise;
end Copy_Node;
------------
-- Delete --
------------
procedure Delete (Container : in out Map; Key : Key_Type) is
X : Node_Access;
begin
Key_Ops.Delete_Key_Sans_Free (Container.HT, Key, X);
if Checks and then X = null then
raise Constraint_Error with "attempt to delete key not in map";
end if;
Free (X);
end Delete;
procedure Delete (Container : in out Map; Position : in out Cursor) is
begin
TC_Check (Container.HT.TC);
if Checks and then Position.Node = null then
raise Constraint_Error with
"Position cursor of Delete equals No_Element";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor of Delete designates wrong map";
end if;
pragma Assert (Vet (Position), "bad cursor in Delete");
HT_Ops.Delete_Node_Sans_Free (Container.HT, Position.Node);
Free (Position.Node);
Position.Container := null;
Position.Position := No_Element.Position;
pragma Assert (Position = No_Element);
end Delete;
-------------
-- Element --
-------------
function Element (Container : Map; Key : Key_Type) return Element_Type is
HT : Hash_Table_Type renames Container'Unrestricted_Access.HT;
Node : constant Node_Access := Key_Ops.Find (HT, Key);
begin
if Checks and then Node = null then
raise Constraint_Error with
"no element available because key not in map";
end if;
return Node.Element.all;
end Element;
function Element (Position : Cursor) return Element_Type is
begin
if Checks and then Position.Node = null then
raise Constraint_Error with
"Position cursor of function Element equals No_Element";
end if;
if Checks and then Position.Node.Element = null then
raise Program_Error with
"Position cursor of function Element is bad";
end if;
pragma Assert (Vet (Position), "bad cursor in function Element");
return Position.Node.Element.all;
end Element;
-----------
-- Empty --
-----------
function Empty (Capacity : Count_Type := 1000) return Map is
begin
return Result : Map do
Reserve_Capacity (Result, Capacity);
end return;
end Empty;
-------------------------
-- Equivalent_Key_Node --
-------------------------
function Equivalent_Key_Node
(Key : Key_Type;
Node : Node_Access) return Boolean
is
begin
return Equivalent_Keys (Key, Node.Key.all);
end Equivalent_Key_Node;
---------------------
-- Equivalent_Keys --
---------------------
function Equivalent_Keys (Left, Right : Cursor) return Boolean is
begin
if Checks and then Left.Node = null then
raise Constraint_Error with
"Left cursor of Equivalent_Keys equals No_Element";
end if;
if Checks and then Right.Node = null then
raise Constraint_Error with
"Right cursor of Equivalent_Keys equals No_Element";
end if;
if Checks and then Left.Node.Key = null then
raise Program_Error with
"Left cursor of Equivalent_Keys is bad";
end if;
if Checks and then Right.Node.Key = null then
raise Program_Error with
"Right cursor of Equivalent_Keys is bad";
end if;
pragma Assert (Vet (Left), "bad Left cursor in Equivalent_Keys");
pragma Assert (Vet (Right), "bad Right cursor in Equivalent_Keys");
return Equivalent_Keys (Left.Node.Key.all, Right.Node.Key.all);
end Equivalent_Keys;
function Equivalent_Keys
(Left : Cursor;
Right : Key_Type) return Boolean
is
begin
if Checks and then Left.Node = null then
raise Constraint_Error with
"Left cursor of Equivalent_Keys equals No_Element";
end if;
if Checks and then Left.Node.Key = null then
raise Program_Error with
"Left cursor of Equivalent_Keys is bad";
end if;
pragma Assert (Vet (Left), "bad Left cursor in Equivalent_Keys");
return Equivalent_Keys (Left.Node.Key.all, Right);
end Equivalent_Keys;
function Equivalent_Keys
(Left : Key_Type;
Right : Cursor) return Boolean
is
begin
if Checks and then Right.Node = null then
raise Constraint_Error with
"Right cursor of Equivalent_Keys equals No_Element";
end if;
if Checks and then Right.Node.Key = null then
raise Program_Error with
"Right cursor of Equivalent_Keys is bad";
end if;
pragma Assert (Vet (Right), "bad Right cursor in Equivalent_Keys");
return Equivalent_Keys (Left, Right.Node.Key.all);
end Equivalent_Keys;
-------------
-- Exclude --
-------------
procedure Exclude (Container : in out Map; Key : Key_Type) is
X : Node_Access;
begin
Key_Ops.Delete_Key_Sans_Free (Container.HT, Key, X);
Free (X);
end Exclude;
--------------
-- Finalize --
--------------
procedure Finalize (Container : in out Map) is
begin
HT_Ops.Finalize (Container.HT);
end Finalize;
procedure Finalize (Object : in out Iterator) is
begin
if Object.Container /= null then
Unbusy (Object.Container.HT.TC);
end if;
end Finalize;
----------
-- Find --
----------
function Find (Container : Map; Key : Key_Type) return Cursor is
HT : Hash_Table_Type renames Container'Unrestricted_Access.HT;
Node : constant Node_Access := Key_Ops.Find (HT, Key);
begin
if Node = null then
return No_Element;
end if;
return Cursor'
(Container'Unrestricted_Access, Node, HT_Ops.Index (HT, Node));
end Find;
--------------------
-- Find_Equal_Key --
--------------------
function Find_Equal_Key
(R_HT : Hash_Table_Type;
L_Node : Node_Access) return Boolean
is
R_Index : constant Hash_Type := Key_Ops.Index (R_HT, L_Node.Key.all);
R_Node : Node_Access := R_HT.Buckets (R_Index);
begin
while R_Node /= null loop
if Equivalent_Keys (L_Node.Key.all, R_Node.Key.all) then
return L_Node.Element.all = R_Node.Element.all;
end if;
R_Node := R_Node.Next;
end loop;
return False;
end Find_Equal_Key;
-----------
-- First --
-----------
function First (Container : Map) return Cursor is
Pos : Hash_Type;
Node : constant Node_Access := HT_Ops.First (Container.HT, Pos);
begin
if Node = null then
return No_Element;
else
return Cursor'(Container'Unrestricted_Access, Node, Pos);
end if;
end First;
function First (Object : Iterator) return Cursor is
begin
return Object.Container.First;
end First;
----------
-- Free --
----------
procedure Free (X : in out Node_Access) is
procedure Deallocate is
new Ada.Unchecked_Deallocation (Node_Type, Node_Access);
begin
if X = null then
return;
end if;
X.Next := X; -- detect mischief (in Vet)
begin
Free_Key (X.Key);
exception
when others =>
X.Key := null;
begin
Free_Element (X.Element);
exception
when others =>
X.Element := null;
end;
Deallocate (X);
raise;
end;
begin
Free_Element (X.Element);
exception
when others =>
X.Element := null;
Deallocate (X);
raise;
end;
Deallocate (X);
end Free;
------------------------
-- Get_Element_Access --
------------------------
function Get_Element_Access
(Position : Cursor) return not null Element_Access is
begin
return Position.Node.Element;
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 /= null;
end Has_Element;
---------------
-- Hash_Node --
---------------
function Hash_Node (Node : Node_Access) return Hash_Type is
begin
return Hash (Node.Key.all);
end Hash_Node;
-------------
-- Include --
-------------
procedure Include
(Container : in out Map;
Key : Key_Type;
New_Item : Element_Type)
is
Position : Cursor;
Inserted : Boolean;
K : Key_Access;
E : Element_Access;
begin
Insert (Container, Key, New_Item, Position, Inserted);
if not Inserted then
TE_Check (Container.HT.TC);
K := Position.Node.Key;
E := Position.Node.Element;
Position.Node.Key := new Key_Type'(Key);
declare
-- The element allocator may need an accessibility check in the
-- case the actual type is class-wide or has access discriminants
-- (see RM 4.8(10.1) and AI12-0035).
pragma Unsuppress (Accessibility_Check);
begin
Position.Node.Element := new Element_Type'(New_Item);
exception
when others =>
Free_Key (K);
raise;
end;
Free_Key (K);
Free_Element (E);
end if;
end Include;
------------
-- Insert --
------------
procedure Insert
(Container : in out Map;
Key : Key_Type;
New_Item : Element_Type;
Position : out Cursor;
Inserted : out Boolean)
is
function New_Node (Next : Node_Access) return Node_Access;
procedure Local_Insert is
new Key_Ops.Generic_Conditional_Insert (New_Node);
--------------
-- New_Node --
--------------
function New_Node (Next : Node_Access) return Node_Access is
K : Key_Access := new Key_Type'(Key);
E : Element_Access;
-- The element allocator may need an accessibility check in the case
-- the actual type is class-wide or has access discriminants (see
-- RM 4.8(10.1) and AI12-0035).
pragma Unsuppress (Accessibility_Check);
begin
E := new Element_Type'(New_Item);
return new Node_Type'(K, E, Next);
exception
when others =>
Free_Key (K);
Free_Element (E);
raise;
end New_Node;
HT : Hash_Table_Type renames Container.HT;
-- Start of processing for Insert
begin
if HT_Ops.Capacity (HT) = 0 then
HT_Ops.Reserve_Capacity (HT, 1);
end if;
Local_Insert (HT, Key, Position.Node, Inserted);
if Inserted
and then HT.Length > HT_Ops.Capacity (HT)
then
HT_Ops.Reserve_Capacity (HT, HT.Length);
end if;
Position.Container := Container'Unchecked_Access;
Position.Position := HT_Ops.Index (HT, Position.Node);
end Insert;
procedure Insert
(Container : in out Map;
Key : Key_Type;
New_Item : Element_Type)
is
Position : Cursor;
Inserted : Boolean;
begin
Insert (Container, Key, New_Item, Position, Inserted);
if Checks and then not Inserted then
raise Constraint_Error with
"attempt to insert key already in map";
end if;
end Insert;
--------------
-- Is_Empty --
--------------
function Is_Empty (Container : Map) return Boolean is
begin
return Container.HT.Length = 0;
end Is_Empty;
-------------
-- Iterate --
-------------
procedure Iterate
(Container : Map;
Process : not null access procedure (Position : Cursor))
is
procedure Process_Node (Node : Node_Access; Position : Hash_Type);
pragma Inline (Process_Node);
procedure Local_Iterate is
new HT_Ops.Generic_Iteration_With_Position (Process_Node);
------------------
-- Process_Node --
------------------
procedure Process_Node (Node : Node_Access; Position : Hash_Type) is
begin
Process (Cursor'(Container'Unrestricted_Access, Node, Position));
end Process_Node;
Busy : With_Busy (Container.HT.TC'Unrestricted_Access);
-- Start of processing for Iterate
begin
Local_Iterate (Container.HT);
end Iterate;
function Iterate
(Container : Map) return Map_Iterator_Interfaces.Forward_Iterator'Class
is
begin
return It : constant Iterator :=
(Limited_Controlled with Container => Container'Unrestricted_Access)
do
Busy (Container.HT.TC'Unrestricted_Access.all);
end return;
end Iterate;
---------
-- Key --
---------
function Key (Position : Cursor) return Key_Type is
begin
if Checks and then Position.Node = null then
raise Constraint_Error with
"Position cursor of function Key equals No_Element";
end if;
if Checks and then Position.Node.Key = null then
raise Program_Error with
"Position cursor of function Key is bad";
end if;
pragma Assert (Vet (Position), "bad cursor in function Key");
return Position.Node.Key.all;
end Key;
------------
-- Length --
------------
function Length (Container : Map) return Count_Type is
begin
return Container.HT.Length;
end Length;
----------
-- Move --
----------
procedure Move
(Target : in out Map;
Source : in out Map)
is
begin
HT_Ops.Move (Target => Target.HT, Source => Source.HT);
end Move;
----------
-- Next --
----------
function Next (Node : Node_Access) return Node_Access is
begin
return Node.Next;
end Next;
procedure Next (Position : in out Cursor) is
begin
Position := Next (Position);
end Next;
function Next (Position : Cursor) return Cursor is
Node : Node_Access;
Pos : Hash_Type;
begin
if Position.Node = null then
return No_Element;
end if;
if Checks and then
(Position.Node.Key = null or else Position.Node.Element = null)
then
raise Program_Error with "Position cursor of Next is bad";
end if;
pragma Assert (Vet (Position), "Position cursor of Next is bad");
Pos := Position.Position;
Node := HT_Ops.Next (Position.Container.HT, Position.Node, Pos);
if Node = null then
return No_Element;
else
return Cursor'(Position.Container, Node, Pos);
end if;
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 map";
end if;
return Next (Position);
end Next;
----------------------
-- Pseudo_Reference --
----------------------
function Pseudo_Reference
(Container : aliased Map'Class) return Reference_Control_Type
is
TC : constant Tamper_Counts_Access :=
Container.HT.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 (Key : Key_Type;
Element : Element_Type))
is
begin
if Checks and then Position.Node = null then
raise Constraint_Error with
"Position cursor of Query_Element equals No_Element";
end if;
if Checks and then
(Position.Node.Key = null or else Position.Node.Element = null)
then
raise Program_Error with
"Position cursor of Query_Element is bad";
end if;
pragma Assert (Vet (Position), "bad cursor in Query_Element");
declare
M : Map renames Position.Container.all;
HT : Hash_Table_Type renames M.HT'Unrestricted_Access.all;
Lock : With_Lock (HT.TC'Unrestricted_Access);
K : Key_Type renames Position.Node.Key.all;
E : Element_Type renames Position.Node.Element.all;
begin
Process (K, E);
end;
end Query_Element;
---------------
-- Put_Image --
---------------
procedure Put_Image
(S : in out Ada.Strings.Text_Buffers.Root_Buffer_Type'Class; V : Map)
is
First_Time : Boolean := True;
use System.Put_Images;
procedure Put_Key_Value (Position : Cursor);
procedure Put_Key_Value (Position : Cursor) is
begin
if First_Time then
First_Time := False;
else
Simple_Array_Between (S);
end if;
Key_Type'Put_Image (S, Key (Position));
Put_Arrow (S);
Element_Type'Put_Image (S, Element (Position));
end Put_Key_Value;
begin
Array_Before (S);
Iterate (V, Put_Key_Value'Access);
Array_After (S);
end Put_Image;
----------
-- Read --
----------
procedure Read_Nodes is new HT_Ops.Generic_Read (Read_Node);
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Container : out Map)
is
begin
Read_Nodes (Stream, Container.HT);
end Read;
procedure Read
(Stream : not null access Root_Stream_Type'Class;
Item : out Cursor)
is
begin
raise Program_Error with "attempt to stream map cursor";
end 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;
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;
---------------
-- Read_Node --
---------------
function Read_Node
(Stream : not null access Root_Stream_Type'Class) return Node_Access
is
Node : Node_Access := new Node_Type;
begin
begin
Node.Key := new Key_Type'(Key_Type'Input (Stream));
exception
when others =>
Free (Node);
raise;
end;
begin
Node.Element := new Element_Type'(Element_Type'Input (Stream));
exception
when others =>
Free_Key (Node.Key);
Free (Node);
raise;
end;
return Node;
end Read_Node;
---------------
-- Reference --
---------------
function Reference
(Container : aliased in out Map;
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 map";
end if;
if Checks and then Position.Node.Element = null then
raise Program_Error with
"Position cursor has no element";
end if;
pragma Assert
(Vet (Position),
"Position cursor in function Reference is bad");
declare
M : Map renames Position.Container.all;
HT : Hash_Table_Type renames M.HT'Unrestricted_Access.all;
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Reference_Type :=
(Element => Position.Node.Element.all'Access,
Control => (Controlled with TC))
do
Busy (TC.all);
end return;
end;
end Reference;
function Reference
(Container : aliased in out Map;
Key : Key_Type) return Reference_Type
is
HT : Hash_Table_Type renames Container.HT;
Node : constant Node_Access := Key_Ops.Find (HT, Key);
begin
if Checks and then Node = null then
raise Constraint_Error with "key not in map";
end if;
if Checks and then Node.Element = null then
raise Program_Error with "key has no element";
end if;
declare
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Reference_Type :=
(Element => Node.Element.all'Access,
Control => (Controlled with TC))
do
Busy (TC.all);
end return;
end;
end Reference;
-------------
-- Replace --
-------------
procedure Replace
(Container : in out Map;
Key : Key_Type;
New_Item : Element_Type)
is
Node : constant Node_Access := Key_Ops.Find (Container.HT, Key);
K : Key_Access;
E : Element_Access;
begin
TE_Check (Container.HT.TC);
if Checks and then Node = null then
raise Constraint_Error with
"attempt to replace key not in map";
end if;
K := Node.Key;
E := Node.Element;
Node.Key := new Key_Type'(Key);
declare
-- The element allocator may need an accessibility check in the case
-- the actual type is class-wide or has access discriminants (see
-- RM 4.8(10.1) and AI12-0035).
pragma Unsuppress (Accessibility_Check);
begin
Node.Element := new Element_Type'(New_Item);
exception
when others =>
Free_Key (K);
raise;
end;
Free_Key (K);
Free_Element (E);
end Replace;
---------------------
-- Replace_Element --
---------------------
procedure Replace_Element
(Container : in out Map;
Position : Cursor;
New_Item : Element_Type)
is
begin
TE_Check (Position.Container.HT.TC);
if Checks and then Position.Node = null then
raise Constraint_Error with
"Position cursor of Replace_Element equals No_Element";
end if;
if Checks and then
(Position.Node.Key = null or else Position.Node.Element = null)
then
raise Program_Error with
"Position cursor of Replace_Element is bad";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor of Replace_Element designates wrong map";
end if;
pragma Assert (Vet (Position), "bad cursor in Replace_Element");
declare
X : Element_Access := Position.Node.Element;
-- The element allocator may need an accessibility check in the case
-- the actual type is class-wide or has access discriminants (see
-- RM 4.8(10.1) and AI12-0035).
pragma Unsuppress (Accessibility_Check);
begin
Position.Node.Element := new Element_Type'(New_Item);
Free_Element (X);
end;
end Replace_Element;
----------------------
-- Reserve_Capacity --
----------------------
procedure Reserve_Capacity
(Container : in out Map;
Capacity : Count_Type)
is
begin
HT_Ops.Reserve_Capacity (Container.HT, Capacity);
end Reserve_Capacity;
--------------
-- Set_Next --
--------------
procedure Set_Next (Node : Node_Access; Next : Node_Access) is
begin
Node.Next := Next;
end Set_Next;
--------------------
-- Update_Element --
--------------------
procedure Update_Element
(Container : in out Map;
Position : Cursor;
Process : not null access procedure (Key : Key_Type;
Element : in out Element_Type))
is
begin
if Checks and then Position.Node = null then
raise Constraint_Error with
"Position cursor of Update_Element equals No_Element";
end if;
if Checks and then
(Position.Node.Key = null or else Position.Node.Element = null)
then
raise Program_Error with
"Position cursor of Update_Element is bad";
end if;
if Checks and then Position.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor of Update_Element designates wrong map";
end if;
pragma Assert (Vet (Position), "bad cursor in Update_Element");
declare
HT : Hash_Table_Type renames Container.HT;
Lock : With_Lock (HT.TC'Unrestricted_Access);
K : Key_Type renames Position.Node.Key.all;
E : Element_Type renames Position.Node.Element.all;
begin
Process (K, E);
end;
end Update_Element;
---------
-- Vet --
---------
function Vet (Position : Cursor) return Boolean is
begin
if Position.Node = null then
return Position.Container = null;
end if;
if Position.Container = null then
return False;
end if;
if Position.Node.Next = Position.Node then
return False;
end if;
if Position.Node.Key = null then
return False;
end if;
if Position.Node.Element = null then
return False;
end if;
declare
HT : Hash_Table_Type renames Position.Container.HT;
X : Node_Access;
begin
if HT.Length = 0 then
return False;
end if;
if HT.Buckets = null
or else HT.Buckets'Length = 0
then
return False;
end if;
X := HT.Buckets (Key_Ops.Checked_Index (HT, Position.Node.Key.all));
for J in 1 .. HT.Length loop
if X = Position.Node then
return True;
end if;
if X = null then
return False;
end if;
if X = X.Next then -- to prevent unnecessary looping
return False;
end if;
X := X.Next;
end loop;
return False;
end;
end Vet;
-----------
-- Write --
-----------
procedure Write_Nodes is new HT_Ops.Generic_Write (Write_Node);
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Container : Map)
is
begin
Write_Nodes (Stream, Container.HT);
end Write;
procedure Write
(Stream : not null access Root_Stream_Type'Class;
Item : Cursor)
is
begin
raise Program_Error with "attempt to stream map cursor";
end 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;
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;
----------------
-- Write_Node --
----------------
procedure Write_Node
(Stream : not null access Root_Stream_Type'Class;
Node : Node_Access)
is
begin
Key_Type'Output (Stream, Node.Key.all);
Element_Type'Output (Stream, Node.Element.all);
end Write_Node;
end Ada.Containers.Indefinite_Hashed_Maps;