1947 lines
51 KiB
Ada
1947 lines
51 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT LIBRARY COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2004-2015, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- This unit was originally developed by Matthew J Heaney. --
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------------------------------------------------------------------------------
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with Ada.Containers.Hash_Tables.Generic_Bounded_Operations;
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pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Operations);
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with Ada.Containers.Hash_Tables.Generic_Bounded_Keys;
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pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Bounded_Keys);
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with Ada.Containers.Helpers; use Ada.Containers.Helpers;
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with Ada.Containers.Prime_Numbers; use Ada.Containers.Prime_Numbers;
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with System; use type System.Address;
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package body Ada.Containers.Bounded_Hashed_Sets is
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pragma Warnings (Off, "variable ""Busy*"" is not referenced");
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pragma Warnings (Off, "variable ""Lock*"" is not referenced");
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-- See comment in Ada.Containers.Helpers
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-----------------------
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-- Local Subprograms --
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-----------------------
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function Equivalent_Keys
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(Key : Element_Type;
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Node : Node_Type) return Boolean;
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pragma Inline (Equivalent_Keys);
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function Hash_Node (Node : Node_Type) return Hash_Type;
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pragma Inline (Hash_Node);
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procedure Insert
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(Container : in out Set;
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New_Item : Element_Type;
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Node : out Count_Type;
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Inserted : out Boolean);
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function Is_In (HT : Set; Key : Node_Type) return Boolean;
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pragma Inline (Is_In);
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procedure Set_Element (Node : in out Node_Type; Item : Element_Type);
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pragma Inline (Set_Element);
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function Next (Node : Node_Type) return Count_Type;
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pragma Inline (Next);
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procedure Set_Next (Node : in out Node_Type; Next : Count_Type);
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pragma Inline (Set_Next);
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function Vet (Position : Cursor) return Boolean;
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--------------------------
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-- Local Instantiations --
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--------------------------
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package HT_Ops is new Hash_Tables.Generic_Bounded_Operations
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(HT_Types => HT_Types,
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Hash_Node => Hash_Node,
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Next => Next,
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Set_Next => Set_Next);
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package Element_Keys is new Hash_Tables.Generic_Bounded_Keys
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(HT_Types => HT_Types,
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Next => Next,
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Set_Next => Set_Next,
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Key_Type => Element_Type,
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Hash => Hash,
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Equivalent_Keys => Equivalent_Keys);
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procedure Replace_Element is
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new Element_Keys.Generic_Replace_Element (Hash_Node, Set_Element);
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---------
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-- "=" --
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---------
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function "=" (Left, Right : Set) return Boolean is
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function Find_Equal_Key
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(R_HT : Hash_Table_Type'Class;
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L_Node : Node_Type) return Boolean;
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pragma Inline (Find_Equal_Key);
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function Is_Equal is
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new HT_Ops.Generic_Equal (Find_Equal_Key);
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--------------------
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-- Find_Equal_Key --
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--------------------
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function Find_Equal_Key
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(R_HT : Hash_Table_Type'Class;
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L_Node : Node_Type) return Boolean
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is
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R_Index : constant Hash_Type :=
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Element_Keys.Index (R_HT, L_Node.Element);
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R_Node : Count_Type := R_HT.Buckets (R_Index);
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begin
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loop
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if R_Node = 0 then
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return False;
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end if;
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if L_Node.Element = R_HT.Nodes (R_Node).Element then
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return True;
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end if;
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R_Node := Next (R_HT.Nodes (R_Node));
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end loop;
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end Find_Equal_Key;
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-- Start of processing for "="
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begin
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return Is_Equal (Left, Right);
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end "=";
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------------
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-- Assign --
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------------
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procedure Assign (Target : in out Set; Source : Set) is
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procedure Insert_Element (Source_Node : Count_Type);
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procedure Insert_Elements is
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new HT_Ops.Generic_Iteration (Insert_Element);
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--------------------
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-- Insert_Element --
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--------------------
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procedure Insert_Element (Source_Node : Count_Type) is
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N : Node_Type renames Source.Nodes (Source_Node);
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X : Count_Type;
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B : Boolean;
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begin
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Insert (Target, N.Element, X, B);
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pragma Assert (B);
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end Insert_Element;
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-- Start of processing for Assign
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begin
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if Target'Address = Source'Address then
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return;
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end if;
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if Checks and then Target.Capacity < Source.Length then
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raise Capacity_Error
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with "Target capacity is less than Source length";
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end if;
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HT_Ops.Clear (Target);
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Insert_Elements (Source);
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end Assign;
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--------------
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-- Capacity --
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--------------
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function Capacity (Container : Set) return Count_Type is
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begin
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return Container.Capacity;
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end Capacity;
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-----------
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-- Clear --
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-----------
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procedure Clear (Container : in out Set) is
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begin
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HT_Ops.Clear (Container);
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end Clear;
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------------------------
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-- Constant_Reference --
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------------------------
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function Constant_Reference
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(Container : aliased Set;
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Position : Cursor) return Constant_Reference_Type
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is
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begin
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if Checks and then Position.Container = null then
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raise Constraint_Error with "Position cursor has no element";
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end if;
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if Checks and then Position.Container /= Container'Unrestricted_Access
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then
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raise Program_Error with
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"Position cursor designates wrong container";
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end if;
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pragma Assert (Vet (Position), "bad cursor in Constant_Reference");
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declare
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N : Node_Type renames Container.Nodes (Position.Node);
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TC : constant Tamper_Counts_Access :=
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Container.TC'Unrestricted_Access;
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begin
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return R : constant Constant_Reference_Type :=
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(Element => N.Element'Access,
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Control => (Controlled with TC))
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do
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Lock (TC.all);
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end return;
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end;
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end Constant_Reference;
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--------------
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-- Contains --
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--------------
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function Contains (Container : Set; Item : Element_Type) return Boolean is
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begin
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return Find (Container, Item) /= No_Element;
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end Contains;
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----------
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-- Copy --
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----------
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function Copy
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(Source : Set;
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Capacity : Count_Type := 0;
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Modulus : Hash_Type := 0) return Set
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is
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C : Count_Type;
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M : Hash_Type;
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begin
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if Capacity = 0 then
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C := Source.Length;
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elsif Capacity >= Source.Length then
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C := Capacity;
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elsif Checks then
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raise Capacity_Error with "Capacity value too small";
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end if;
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if Modulus = 0 then
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M := Default_Modulus (C);
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else
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M := Modulus;
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end if;
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return Target : Set (Capacity => C, Modulus => M) do
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Assign (Target => Target, Source => Source);
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end return;
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end Copy;
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---------------------
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-- Default_Modulus --
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---------------------
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function Default_Modulus (Capacity : Count_Type) return Hash_Type is
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begin
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return To_Prime (Capacity);
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end Default_Modulus;
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------------
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-- Delete --
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------------
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procedure Delete
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(Container : in out Set;
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Item : Element_Type)
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is
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X : Count_Type;
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begin
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Element_Keys.Delete_Key_Sans_Free (Container, Item, X);
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if Checks and then X = 0 then
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raise Constraint_Error with "attempt to delete element not in set";
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end if;
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HT_Ops.Free (Container, X);
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end Delete;
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procedure Delete
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(Container : in out Set;
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Position : in out Cursor)
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is
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begin
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if Checks and then Position.Node = 0 then
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raise Constraint_Error with "Position cursor equals No_Element";
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end if;
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if Checks and then Position.Container /= Container'Unrestricted_Access
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then
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raise Program_Error with "Position cursor designates wrong set";
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end if;
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TC_Check (Container.TC);
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pragma Assert (Vet (Position), "bad cursor in Delete");
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HT_Ops.Delete_Node_Sans_Free (Container, Position.Node);
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HT_Ops.Free (Container, Position.Node);
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Position := No_Element;
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end Delete;
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----------------
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-- Difference --
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----------------
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procedure Difference
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(Target : in out Set;
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Source : Set)
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is
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Tgt_Node, Src_Node : Count_Type;
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Src : Set renames Source'Unrestricted_Access.all;
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TN : Nodes_Type renames Target.Nodes;
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SN : Nodes_Type renames Source.Nodes;
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begin
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if Target'Address = Source'Address then
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HT_Ops.Clear (Target);
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return;
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end if;
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if Source.Length = 0 then
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return;
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end if;
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TC_Check (Target.TC);
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if Source.Length < Target.Length then
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Src_Node := HT_Ops.First (Source);
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while Src_Node /= 0 loop
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Tgt_Node := Element_Keys.Find (Target, SN (Src_Node).Element);
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if Tgt_Node /= 0 then
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HT_Ops.Delete_Node_Sans_Free (Target, Tgt_Node);
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HT_Ops.Free (Target, Tgt_Node);
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end if;
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Src_Node := HT_Ops.Next (Src, Src_Node);
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end loop;
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else
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Tgt_Node := HT_Ops.First (Target);
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while Tgt_Node /= 0 loop
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if Is_In (Source, TN (Tgt_Node)) then
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declare
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X : constant Count_Type := Tgt_Node;
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begin
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Tgt_Node := HT_Ops.Next (Target, Tgt_Node);
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HT_Ops.Delete_Node_Sans_Free (Target, X);
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HT_Ops.Free (Target, X);
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end;
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else
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Tgt_Node := HT_Ops.Next (Target, Tgt_Node);
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end if;
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end loop;
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end if;
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end Difference;
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function Difference (Left, Right : Set) return Set is
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begin
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if Left'Address = Right'Address then
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return Empty_Set;
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end if;
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if Left.Length = 0 then
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return Empty_Set;
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end if;
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if Right.Length = 0 then
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return Left;
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end if;
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return Result : Set (Left.Length, To_Prime (Left.Length)) do
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Iterate_Left : declare
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procedure Process (L_Node : Count_Type);
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procedure Iterate is
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new HT_Ops.Generic_Iteration (Process);
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-------------
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-- Process --
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-------------
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procedure Process (L_Node : Count_Type) is
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N : Node_Type renames Left.Nodes (L_Node);
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X : Count_Type;
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B : Boolean;
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begin
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if not Is_In (Right, N) then
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Insert (Result, N.Element, X, B); -- optimize this ???
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pragma Assert (B);
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pragma Assert (X > 0);
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end if;
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end Process;
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-- Start of processing for Iterate_Left
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begin
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Iterate (Left);
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end Iterate_Left;
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end return;
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end Difference;
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-------------
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-- Element --
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-------------
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function Element (Position : Cursor) return Element_Type is
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begin
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if Checks and then Position.Node = 0 then
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raise Constraint_Error with "Position cursor equals No_Element";
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end if;
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pragma Assert (Vet (Position), "bad cursor in function Element");
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declare
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S : Set renames Position.Container.all;
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N : Node_Type renames S.Nodes (Position.Node);
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begin
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return N.Element;
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end;
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end Element;
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---------------------
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-- Equivalent_Sets --
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---------------------
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function Equivalent_Sets (Left, Right : Set) return Boolean is
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function Find_Equivalent_Key
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(R_HT : Hash_Table_Type'Class;
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L_Node : Node_Type) return Boolean;
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pragma Inline (Find_Equivalent_Key);
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function Is_Equivalent is
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new HT_Ops.Generic_Equal (Find_Equivalent_Key);
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-------------------------
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-- Find_Equivalent_Key --
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-------------------------
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function Find_Equivalent_Key
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(R_HT : Hash_Table_Type'Class;
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L_Node : Node_Type) return Boolean
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is
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R_Index : constant Hash_Type :=
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Element_Keys.Index (R_HT, L_Node.Element);
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R_Node : Count_Type := R_HT.Buckets (R_Index);
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RN : Nodes_Type renames R_HT.Nodes;
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begin
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loop
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if R_Node = 0 then
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return False;
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end if;
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if Equivalent_Elements (L_Node.Element, RN (R_Node).Element) then
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return True;
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end if;
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R_Node := Next (R_HT.Nodes (R_Node));
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end loop;
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end Find_Equivalent_Key;
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-- Start of processing for Equivalent_Sets
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begin
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return Is_Equivalent (Left, Right);
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end Equivalent_Sets;
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-------------------------
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-- Equivalent_Elements --
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-------------------------
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function Equivalent_Elements (Left, Right : Cursor)
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return Boolean is
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begin
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if Checks and then Left.Node = 0 then
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raise Constraint_Error with
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"Left cursor of Equivalent_Elements equals No_Element";
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end if;
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if Checks and then Right.Node = 0 then
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raise Constraint_Error with
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"Right cursor of Equivalent_Elements equals No_Element";
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end if;
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pragma Assert (Vet (Left), "bad Left cursor in Equivalent_Elements");
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pragma Assert (Vet (Right), "bad Right cursor in Equivalent_Elements");
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-- AI05-0022 requires that a container implementation detect element
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-- tampering by a generic actual subprogram. However, the following case
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-- falls outside the scope of that AI. Randy Brukardt explained on the
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-- ARG list on 2013/02/07 that:
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-- (Begin Quote):
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-- But for an operation like "<" [the ordered set analog of
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-- Equivalent_Elements], there is no need to "dereference" a cursor
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-- after the call to the generic formal parameter function, so nothing
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-- bad could happen if tampering is undetected. And the operation can
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-- safely return a result without a problem even if an element is
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-- deleted from the container.
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-- (End Quote).
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declare
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LN : Node_Type renames Left.Container.Nodes (Left.Node);
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RN : Node_Type renames Right.Container.Nodes (Right.Node);
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begin
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return Equivalent_Elements (LN.Element, RN.Element);
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end;
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end Equivalent_Elements;
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function Equivalent_Elements
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(Left : Cursor;
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Right : Element_Type) return Boolean
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is
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begin
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if Checks and then Left.Node = 0 then
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raise Constraint_Error with
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"Left cursor of Equivalent_Elements equals No_Element";
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end if;
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pragma Assert (Vet (Left), "Left cursor in Equivalent_Elements is bad");
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declare
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LN : Node_Type renames Left.Container.Nodes (Left.Node);
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begin
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return Equivalent_Elements (LN.Element, Right);
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end;
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end Equivalent_Elements;
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function Equivalent_Elements
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(Left : Element_Type;
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Right : Cursor) return Boolean
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is
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begin
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if Checks and then Right.Node = 0 then
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raise Constraint_Error with
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"Right cursor of Equivalent_Elements equals No_Element";
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end if;
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pragma Assert
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(Vet (Right),
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"Right cursor of Equivalent_Elements is bad");
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declare
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RN : Node_Type renames Right.Container.Nodes (Right.Node);
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begin
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return Equivalent_Elements (Left, RN.Element);
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end;
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end Equivalent_Elements;
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---------------------
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-- Equivalent_Keys --
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---------------------
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function Equivalent_Keys
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(Key : Element_Type;
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Node : Node_Type) return Boolean
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is
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begin
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return Equivalent_Elements (Key, Node.Element);
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end Equivalent_Keys;
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|
|
-------------
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-- Exclude --
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-------------
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procedure Exclude
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(Container : in out Set;
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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;
|
|
pragma Unreferenced (Position);
|
|
|
|
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
|
|
Lock (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;
|
|
|
|
----------
|
|
-- 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
|
|
if Checks and then Node = 0 then
|
|
raise Constraint_Error with
|
|
"attempt to replace element not in set";
|
|
end if;
|
|
|
|
TE_Check (Container.TC);
|
|
|
|
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
|
|
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;
|
|
|
|
declare
|
|
N : Node_Type renames Container.Nodes (Node);
|
|
TC : constant Tamper_Counts_Access :=
|
|
Container.TC'Unrestricted_Access;
|
|
begin
|
|
return R : constant Constant_Reference_Type :=
|
|
(Element => N.Element'Access,
|
|
Control => (Controlled with TC))
|
|
do
|
|
Lock (TC.all);
|
|
end return;
|
|
end;
|
|
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
|
|
Lock (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
|
|
Node : constant Count_Type := Key_Keys.Find (Container, Key);
|
|
|
|
begin
|
|
if Checks and then Node = 0 then
|
|
raise Constraint_Error with "key not in set";
|
|
end if;
|
|
|
|
declare
|
|
P : constant Cursor := Find (Container, Key);
|
|
begin
|
|
return R : constant Reference_Type :=
|
|
(Element => Container.Nodes (Node).Element'Unrestricted_Access,
|
|
Control =>
|
|
(Controlled with
|
|
Container.TC'Unrestricted_Access,
|
|
Container'Unrestricted_Access,
|
|
Index => Key_Keys.Index (Container, Key),
|
|
Old_Pos => P,
|
|
Old_Hash => Hash (Key)))
|
|
do
|
|
Lock (Container.TC);
|
|
end return;
|
|
end;
|
|
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;
|