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CodeBlocksPortable/MinGW/lib/gcc/mingw32/6.3.0/adainclude/a-cohama.adb

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Ada

------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- A D A . C O N T A I N E R S . H A S H E D _ M A P S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2004-2015, 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.Unchecked_Deallocation;
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 System; use type System.Address;
package body Ada.Containers.Hashed_Maps is
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 Copy_Node
(Source : 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);
procedure Free (X : in out Node_Access);
function Find_Equal_Key
(R_HT : Hash_Table_Type;
L_Node : Node_Access) return Boolean;
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;
pragma Inline (Read_Node);
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);
pragma Inline (Write_Node);
--------------------------
-- Local Instantiations --
--------------------------
package HT_Ops is new 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);
procedure Read_Nodes is new HT_Ops.Generic_Read (Read_Node);
procedure Write_Nodes is new HT_Ops.Generic_Write (Write_Node);
---------
-- "=" --
---------
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, New_Item => Node.Element);
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;
pragma Assert
(Vet (Position),
"Position cursor in Constant_Reference is bad");
declare
HT : Hash_Table_Type renames Container'Unrestricted_Access.all.HT;
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Constant_Reference_Type :=
(Element => Position.Node.Element'Access,
Control => (Controlled with TC))
do
Lock (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;
declare
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Constant_Reference_Type :=
(Element => Node.Element'Access,
Control => (Controlled with TC))
do
Lock (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 = 0 then
C := Source.Length;
elsif Capacity >= Source.Length then
C := Capacity;
elsif Checks then
raise Capacity_Error
with "Requested capacity is less than Source length";
end if;
return Target : Map do
Target.Reserve_Capacity (C);
Target.Assign (Source);
end return;
end Copy;
---------------
-- Copy_Node --
---------------
function Copy_Node
(Source : Node_Access) return Node_Access
is
Target : constant Node_Access :=
new Node_Type'(Key => Source.Key,
Element => Source.Element,
Next => null);
begin
return Target;
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
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;
TC_Check (Container.HT.TC);
pragma Assert (Vet (Position), "bad cursor in Delete");
HT_Ops.Delete_Node_Sans_Free (Container.HT, Position.Node);
Free (Position.Node);
Position.Container := null;
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;
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;
pragma Assert (Vet (Position), "bad cursor in function Element");
return Position.Node.Element;
end Element;
-------------------------
-- Equivalent_Key_Node --
-------------------------
function Equivalent_Key_Node
(Key : Key_Type;
Node : Node_Access) return Boolean is
begin
return Equivalent_Keys (Key, Node.Key);
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;
pragma Assert (Vet (Left), "Left cursor of Equivalent_Keys is bad");
pragma Assert (Vet (Right), "Right cursor of Equivalent_Keys is bad");
return Equivalent_Keys (Left.Node.Key, Right.Node.Key);
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;
pragma Assert (Vet (Left), "Left cursor in Equivalent_Keys is bad");
return Equivalent_Keys (Left.Node.Key, 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;
pragma Assert (Vet (Right), "Right cursor of Equivalent_Keys is bad");
return Equivalent_Keys (Left, Right.Node.Key);
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);
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);
R_Node : Node_Access := R_HT.Buckets (R_Index);
begin
while R_Node /= null loop
if Equivalent_Keys (L_Node.Key, R_Node.Key) then
return L_Node.Element = R_Node.Element;
end if;
R_Node := R_Node.Next;
end loop;
return False;
end Find_Equal_Key;
-----------
-- First --
-----------
function First (Container : Map) return Cursor is
Node : constant Node_Access := HT_Ops.First (Container.HT);
begin
if Node = null then
return No_Element;
end if;
return Cursor'(Container'Unrestricted_Access, Node);
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
X.Next := X; -- detect mischief (in Vet)
Deallocate (X);
end if;
end Free;
------------------------
-- Get_Element_Access --
------------------------
function Get_Element_Access
(Position : Cursor) return not null Element_Access is
begin
return 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 /= null;
end Has_Element;
---------------
-- Hash_Node --
---------------
function Hash_Node (Node : Node_Access) return Hash_Type is
begin
return Hash (Node.Key);
end Hash_Node;
-------------
-- Include --
-------------
procedure Include
(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 not Inserted then
TE_Check (Container.HT.TC);
Position.Node.Key := Key;
Position.Node.Element := New_Item;
end if;
end Include;
------------
-- Insert --
------------
procedure Insert
(Container : in out Map;
Key : Key_Type;
Position : out Cursor;
Inserted : out Boolean)
is
function New_Node (Next : Node_Access) return Node_Access;
pragma Inline (New_Node);
procedure Local_Insert is
new Key_Ops.Generic_Conditional_Insert (New_Node);
--------------
-- New_Node --
--------------
function New_Node (Next : Node_Access) return Node_Access is
begin
return new Node_Type'(Key => Key,
Element => <>,
Next => Next);
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'Unrestricted_Access;
end 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;
pragma Inline (New_Node);
procedure Local_Insert is
new Key_Ops.Generic_Conditional_Insert (New_Node);
--------------
-- New_Node --
--------------
function New_Node (Next : Node_Access) return Node_Access is
begin
return new Node_Type'(Key, New_Item, Next);
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'Unrestricted_Access;
end Insert;
procedure Insert
(Container : in out Map;
Key : Key_Type;
New_Item : Element_Type)
is
Position : Cursor;
pragma Unreferenced (Position);
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);
pragma Inline (Process_Node);
procedure Local_Iterate is new HT_Ops.Generic_Iteration (Process_Node);
------------------
-- Process_Node --
------------------
procedure Process_Node (Node : Node_Access) is
begin
Process (Cursor'(Container'Unrestricted_Access, Node));
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;
pragma Assert (Vet (Position), "bad cursor in function Key");
return Position.Node.Key;
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;
function Next (Position : Cursor) return Cursor is
begin
if Position.Node = null then
return No_Element;
end if;
pragma Assert (Vet (Position), "bad cursor in function Next");
declare
HT : Hash_Table_Type renames Position.Container.HT;
Node : constant Node_Access := HT_Ops.Next (HT, Position.Node);
begin
if Node = null 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 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
Lock (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;
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;
E : Element_Type renames Position.Node.Element;
begin
Process (K, E);
end;
end Query_Element;
----------
-- Read --
----------
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;
---------------
-- 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;
pragma Assert
(Vet (Position),
"Position cursor in function Reference is bad");
declare
HT : Hash_Table_Type renames Container'Unrestricted_Access.all.HT;
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Reference_Type :=
(Element => Position.Node.Element'Access,
Control => (Controlled with TC))
do
Lock (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;
declare
TC : constant Tamper_Counts_Access :=
HT.TC'Unrestricted_Access;
begin
return R : constant Reference_Type :=
(Element => Node.Element'Access,
Control => (Controlled with TC))
do
Lock (TC.all);
end return;
end;
end Reference;
---------------
-- Read_Node --
---------------
function Read_Node
(Stream : not null access Root_Stream_Type'Class) return Node_Access
is
Node : Node_Access := new Node_Type;
begin
Key_Type'Read (Stream, Node.Key);
Element_Type'Read (Stream, Node.Element);
return Node;
exception
when others =>
Free (Node);
raise;
end Read_Node;
-------------
-- 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);
begin
if Checks and then Node = null then
raise Constraint_Error with
"attempt to replace key not in map";
end if;
TE_Check (Container.HT.TC);
Node.Key := Key;
Node.Element := New_Item;
end Replace;
---------------------
-- Replace_Element --
---------------------
procedure Replace_Element
(Container : in out Map;
Position : Cursor;
New_Item : Element_Type)
is
begin
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.Container /= Container'Unrestricted_Access
then
raise Program_Error with
"Position cursor of Replace_Element designates wrong map";
end if;
TE_Check (Position.Container.HT.TC);
pragma Assert (Vet (Position), "bad cursor in Replace_Element");
Position.Node.Element := New_Item;
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.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;
E : Element_Type renames Position.Node.Element;
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;
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));
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
(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'Write (Stream, Node.Key);
Element_Type'Write (Stream, Node.Element);
end Write_Node;
end Ada.Containers.Hashed_Maps;