943 lines
23 KiB
Ada
943 lines
23 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 . F O R M A L _ H A S H E D _ M A P S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2010-2015, 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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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.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.Formal_Hashed_Maps with
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SPARK_Mode => Off
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is
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-----------------------
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-- Local Subprograms --
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-----------------------
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-- All local subprograms require comments ???
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function Equivalent_Keys
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(Key : Key_Type;
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Node : Node_Type) return Boolean;
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pragma Inline (Equivalent_Keys);
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procedure Free
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(HT : in out Map;
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X : Count_Type);
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generic
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with procedure Set_Element (Node : in out Node_Type);
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procedure Generic_Allocate
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(HT : in out Map;
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Node : out Count_Type);
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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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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 (Container : Map; 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
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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 Key_Ops is
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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 => Key_Type,
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Hash => Hash,
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Equivalent_Keys => Equivalent_Keys);
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---------
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-- "=" --
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---------
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function "=" (Left, Right : Map) return Boolean is
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begin
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if Length (Left) /= Length (Right) then
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return False;
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end if;
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if Length (Left) = 0 then
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return True;
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end if;
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declare
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Node : Count_Type;
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ENode : Count_Type;
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begin
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Node := Left.First.Node;
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while Node /= 0 loop
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ENode := Find (Container => Right,
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Key => Left.Nodes (Node).Key).Node;
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if ENode = 0 or else
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Right.Nodes (ENode).Element /= Left.Nodes (Node).Element
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then
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return False;
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end if;
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Node := HT_Ops.Next (Left, Node);
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end loop;
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return True;
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end;
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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 Map; Source : Map) is
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procedure Insert_Element (Source_Node : Count_Type);
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pragma Inline (Insert_Element);
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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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begin
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Insert (Target, N.Key, N.Element);
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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 Target.Capacity < Length (Source) then
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raise Constraint_Error with -- correct exception ???
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"Source length exceeds Target capacity";
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end if;
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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 : Map) return Count_Type is
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begin
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return Container.Nodes'Length;
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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 Map) 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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-- Contains --
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--------------
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function Contains (Container : Map; Key : Key_Type) return Boolean is
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begin
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return Find (Container, Key) /= 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 : Map;
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Capacity : Count_Type := 0) return Map
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is
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C : constant Count_Type :=
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Count_Type'Max (Capacity, Source.Capacity);
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H : Hash_Type;
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N : Count_Type;
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Target : Map (C, Source.Modulus);
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Cu : Cursor;
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begin
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if 0 < Capacity and then Capacity < Source.Capacity then
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raise Capacity_Error;
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end if;
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Target.Length := Source.Length;
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Target.Free := Source.Free;
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H := 1;
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while H <= Source.Modulus loop
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Target.Buckets (H) := Source.Buckets (H);
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H := H + 1;
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end loop;
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N := 1;
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while N <= Source.Capacity loop
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Target.Nodes (N) := Source.Nodes (N);
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N := N + 1;
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end loop;
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while N <= C loop
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Cu := (Node => N);
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Free (Target, Cu.Node);
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N := N + 1;
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end loop;
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return Target;
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end Copy;
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---------------------
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-- Current_To_Last --
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---------------------
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function Current_To_Last (Container : Map; Current : Cursor) return Map is
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Curs : Cursor := First (Container);
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C : Map (Container.Capacity, Container.Modulus) :=
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Copy (Container, Container.Capacity);
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Node : Count_Type;
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begin
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if Curs = No_Element then
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Clear (C);
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return C;
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elsif Current /= No_Element and not Has_Element (Container, Current) then
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raise Constraint_Error;
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else
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while Curs.Node /= Current.Node loop
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Node := Curs.Node;
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Delete (C, Curs);
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Curs := Next (Container, (Node => Node));
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end loop;
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return C;
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end if;
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end Current_To_Last;
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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 (Container : in out Map; Key : Key_Type) is
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X : Count_Type;
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begin
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Key_Ops.Delete_Key_Sans_Free (Container, Key, X);
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if X = 0 then
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raise Constraint_Error with "attempt to delete key not in map";
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end if;
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Free (Container, X);
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end Delete;
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procedure Delete (Container : in out Map; Position : in out Cursor) is
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begin
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if not Has_Element (Container, Position) then
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raise Constraint_Error with
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"Position cursor of Delete has no element";
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end if;
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pragma Assert (Vet (Container, Position), "bad cursor in Delete");
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HT_Ops.Delete_Node_Sans_Free (Container, Position.Node);
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Free (Container, Position.Node);
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end Delete;
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-------------
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-- Element --
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-------------
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function Element (Container : Map; Key : Key_Type) return Element_Type is
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Node : constant Count_Type := Find (Container, Key).Node;
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begin
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if Node = 0 then
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raise Constraint_Error with
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"no element available because key not in map";
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end if;
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return Container.Nodes (Node).Element;
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end Element;
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function Element (Container : Map; Position : Cursor) return Element_Type is
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begin
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if not Has_Element (Container, Position) 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 (Container, Position),
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"bad cursor in function Element");
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return Container.Nodes (Position.Node).Element;
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end Element;
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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 : Key_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_Keys (Key, Node.Key);
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end Equivalent_Keys;
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function Equivalent_Keys
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(Left : Map;
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CLeft : Cursor;
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Right : Map;
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CRight : Cursor) return Boolean
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is
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begin
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if not Has_Element (Left, CLeft) then
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raise Constraint_Error with
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"Left cursor of Equivalent_Keys has no element";
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end if;
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if not Has_Element (Right, CRight) then
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raise Constraint_Error with
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"Right cursor of Equivalent_Keys has no element";
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end if;
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pragma Assert (Vet (Left, CLeft),
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"Left cursor of Equivalent_Keys is bad");
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pragma Assert (Vet (Right, CRight),
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"Right cursor of Equivalent_Keys is bad");
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declare
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LN : Node_Type renames Left.Nodes (CLeft.Node);
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RN : Node_Type renames Right.Nodes (CRight.Node);
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begin
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return Equivalent_Keys (LN.Key, RN.Key);
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end;
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end Equivalent_Keys;
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function Equivalent_Keys
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(Left : Map;
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CLeft : Cursor;
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Right : Key_Type) return Boolean
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is
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begin
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if not Has_Element (Left, CLeft) then
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raise Constraint_Error with
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"Left cursor of Equivalent_Keys has no element";
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end if;
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pragma Assert (Vet (Left, CLeft),
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"Left cursor in Equivalent_Keys is bad");
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declare
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LN : Node_Type renames Left.Nodes (CLeft.Node);
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begin
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return Equivalent_Keys (LN.Key, Right);
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end;
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end Equivalent_Keys;
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function Equivalent_Keys
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(Left : Key_Type;
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Right : Map;
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CRight : Cursor) return Boolean
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is
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begin
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if Has_Element (Right, CRight) then
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raise Constraint_Error with
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"Right cursor of Equivalent_Keys has no element";
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end if;
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pragma Assert (Vet (Right, CRight),
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"Right cursor of Equivalent_Keys is bad");
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declare
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RN : Node_Type renames Right.Nodes (CRight.Node);
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begin
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return Equivalent_Keys (Left, RN.Key);
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end;
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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 (Container : in out Map; Key : Key_Type) is
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X : Count_Type;
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begin
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Key_Ops.Delete_Key_Sans_Free (Container, Key, X);
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Free (Container, X);
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end Exclude;
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----------
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-- Find --
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----------
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function Find (Container : Map; Key : Key_Type) return Cursor is
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Node : constant Count_Type := Key_Ops.Find (Container, Key);
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begin
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if Node = 0 then
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return No_Element;
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end if;
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return (Node => Node);
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end Find;
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-----------
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-- First --
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-----------
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function First (Container : Map) return Cursor is
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Node : constant Count_Type := HT_Ops.First (Container);
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begin
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if Node = 0 then
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return No_Element;
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end if;
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return (Node => Node);
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end First;
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-----------------------
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-- First_To_Previous --
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-----------------------
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function First_To_Previous
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(Container : Map;
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Current : Cursor) return Map is
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Curs : Cursor;
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C : Map (Container.Capacity, Container.Modulus) :=
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Copy (Container, Container.Capacity);
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Node : Count_Type;
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begin
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Curs := Current;
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if Curs = No_Element then
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return C;
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elsif not Has_Element (Container, Curs) then
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raise Constraint_Error;
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else
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while Curs.Node /= 0 loop
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Node := Curs.Node;
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Delete (C, Curs);
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Curs := Next (Container, (Node => Node));
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end loop;
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return C;
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end if;
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end First_To_Previous;
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----------
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-- Free --
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----------
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procedure Free (HT : in out Map; X : Count_Type) is
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begin
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HT.Nodes (X).Has_Element := False;
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HT_Ops.Free (HT, X);
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end Free;
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----------------------
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-- Generic_Allocate --
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----------------------
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procedure Generic_Allocate (HT : in out Map; Node : out Count_Type) is
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procedure Allocate is
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new HT_Ops.Generic_Allocate (Set_Element);
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begin
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Allocate (HT, Node);
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HT.Nodes (Node).Has_Element := True;
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end Generic_Allocate;
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-----------------
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-- Has_Element --
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-----------------
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function Has_Element (Container : Map; Position : Cursor) return Boolean is
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begin
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if Position.Node = 0
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or else not Container.Nodes (Position.Node).Has_Element
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then
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return False;
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else
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return True;
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end if;
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end Has_Element;
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|
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---------------
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-- Hash_Node --
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---------------
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function Hash_Node (Node : Node_Type) return Hash_Type is
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begin
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return Hash (Node.Key);
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end Hash_Node;
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|
|
-------------
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-- Include --
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-------------
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procedure Include
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(Container : in out Map;
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Key : Key_Type;
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New_Item : Element_Type)
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is
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Position : Cursor;
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Inserted : Boolean;
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begin
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Insert (Container, Key, New_Item, Position, Inserted);
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if not Inserted then
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declare
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N : Node_Type renames Container.Nodes (Position.Node);
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begin
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N.Key := Key;
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N.Element := New_Item;
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end;
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end if;
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end Include;
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|
|
------------
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-- Insert --
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------------
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|
|
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procedure Insert
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(Container : in out Map;
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Key : Key_Type;
|
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New_Item : Element_Type;
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Position : out Cursor;
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Inserted : out Boolean)
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|
is
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procedure Assign_Key (Node : in out Node_Type);
|
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pragma Inline (Assign_Key);
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|
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function New_Node return Count_Type;
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pragma Inline (New_Node);
|
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|
|
procedure Local_Insert is
|
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new Key_Ops.Generic_Conditional_Insert (New_Node);
|
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|
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procedure Allocate is
|
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new Generic_Allocate (Assign_Key);
|
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|
|
-----------------
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-- Assign_Key --
|
|
-----------------
|
|
|
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procedure Assign_Key (Node : in out Node_Type) is
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begin
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Node.Key := Key;
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Node.Element := New_Item;
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end Assign_Key;
|
|
|
|
--------------
|
|
-- New_Node --
|
|
--------------
|
|
|
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function New_Node return Count_Type is
|
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Result : Count_Type;
|
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begin
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Allocate (Container, Result);
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return Result;
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end New_Node;
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|
|
-- Start of processing for Insert
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|
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begin
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Local_Insert (Container, Key, Position.Node, Inserted);
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end Insert;
|
|
|
|
procedure Insert
|
|
(Container : in out Map;
|
|
Key : Key_Type;
|
|
New_Item : Element_Type)
|
|
is
|
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Position : Cursor;
|
|
pragma Unreferenced (Position);
|
|
|
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Inserted : Boolean;
|
|
|
|
begin
|
|
Insert (Container, Key, New_Item, Position, Inserted);
|
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|
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if 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 Length (Container) = 0;
|
|
end Is_Empty;
|
|
|
|
---------
|
|
-- Key --
|
|
---------
|
|
|
|
function Key (Container : Map; Position : Cursor) return Key_Type is
|
|
begin
|
|
if not Has_Element (Container, Position) then
|
|
raise Constraint_Error with
|
|
"Position cursor of function Key has no element";
|
|
end if;
|
|
|
|
pragma Assert (Vet (Container, Position), "bad cursor in function Key");
|
|
|
|
return Container.Nodes (Position.Node).Key;
|
|
end Key;
|
|
|
|
------------
|
|
-- Length --
|
|
------------
|
|
|
|
function Length (Container : Map) return Count_Type is
|
|
begin
|
|
return Container.Length;
|
|
end Length;
|
|
|
|
----------
|
|
-- Move --
|
|
----------
|
|
|
|
procedure Move
|
|
(Target : in out Map;
|
|
Source : in out Map)
|
|
is
|
|
NN : HT_Types.Nodes_Type renames Source.Nodes;
|
|
X, Y : Count_Type;
|
|
|
|
begin
|
|
if Target'Address = Source'Address then
|
|
return;
|
|
end if;
|
|
|
|
if Target.Capacity < Length (Source) then
|
|
raise Constraint_Error with -- ???
|
|
"Source length exceeds Target capacity";
|
|
end if;
|
|
|
|
Clear (Target);
|
|
|
|
if Source.Length = 0 then
|
|
return;
|
|
end if;
|
|
|
|
X := HT_Ops.First (Source);
|
|
while X /= 0 loop
|
|
Insert (Target, NN (X).Key, NN (X).Element); -- optimize???
|
|
|
|
Y := HT_Ops.Next (Source, X);
|
|
|
|
HT_Ops.Delete_Node_Sans_Free (Source, X);
|
|
Free (Source, X);
|
|
|
|
X := Y;
|
|
end loop;
|
|
end Move;
|
|
|
|
----------
|
|
-- Next --
|
|
----------
|
|
|
|
function Next (Node : Node_Type) return Count_Type is
|
|
begin
|
|
return Node.Next;
|
|
end Next;
|
|
|
|
function Next (Container : Map; Position : Cursor) return Cursor is
|
|
begin
|
|
if Position.Node = 0 then
|
|
return No_Element;
|
|
end if;
|
|
|
|
if not Has_Element (Container, Position) then
|
|
raise Constraint_Error
|
|
with "Position has no element";
|
|
end if;
|
|
|
|
pragma Assert (Vet (Container, Position), "bad cursor in function Next");
|
|
|
|
declare
|
|
Node : constant Count_Type := HT_Ops.Next (Container, Position.Node);
|
|
|
|
begin
|
|
if Node = 0 then
|
|
return No_Element;
|
|
end if;
|
|
|
|
return (Node => Node);
|
|
end;
|
|
end Next;
|
|
|
|
procedure Next (Container : Map; Position : in out Cursor) is
|
|
begin
|
|
Position := Next (Container, Position);
|
|
end Next;
|
|
|
|
-------------
|
|
-- Overlap --
|
|
-------------
|
|
|
|
function Overlap (Left, Right : Map) return Boolean is
|
|
Left_Node : Count_Type;
|
|
Left_Nodes : Nodes_Type renames Left.Nodes;
|
|
|
|
begin
|
|
if Length (Right) = 0 or Length (Left) = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if Left'Address = Right'Address then
|
|
return True;
|
|
end if;
|
|
|
|
Left_Node := First (Left).Node;
|
|
while Left_Node /= 0 loop
|
|
declare
|
|
N : Node_Type renames Left_Nodes (Left_Node);
|
|
E : Key_Type renames N.Key;
|
|
begin
|
|
if Find (Right, E).Node /= 0 then
|
|
return True;
|
|
end if;
|
|
end;
|
|
|
|
Left_Node := HT_Ops.Next (Left, Left_Node);
|
|
end loop;
|
|
|
|
return False;
|
|
end Overlap;
|
|
|
|
-------------
|
|
-- Replace --
|
|
-------------
|
|
|
|
procedure Replace
|
|
(Container : in out Map;
|
|
Key : Key_Type;
|
|
New_Item : Element_Type)
|
|
is
|
|
Node : constant Count_Type := Key_Ops.Find (Container, Key);
|
|
|
|
begin
|
|
if Node = 0 then
|
|
raise Constraint_Error with
|
|
"attempt to replace key not in map";
|
|
end if;
|
|
|
|
declare
|
|
N : Node_Type renames Container.Nodes (Node);
|
|
begin
|
|
N.Key := Key;
|
|
N.Element := New_Item;
|
|
end;
|
|
end Replace;
|
|
|
|
---------------------
|
|
-- Replace_Element --
|
|
---------------------
|
|
|
|
procedure Replace_Element
|
|
(Container : in out Map;
|
|
Position : Cursor;
|
|
New_Item : Element_Type)
|
|
is
|
|
begin
|
|
if not Has_Element (Container, Position) then
|
|
raise Constraint_Error with
|
|
"Position cursor of Replace_Element has no element";
|
|
end if;
|
|
|
|
pragma Assert (Vet (Container, Position),
|
|
"bad cursor in Replace_Element");
|
|
|
|
Container.Nodes (Position.Node).Element := New_Item;
|
|
end Replace_Element;
|
|
|
|
----------------------
|
|
-- Reserve_Capacity --
|
|
----------------------
|
|
|
|
procedure Reserve_Capacity
|
|
(Container : in out Map;
|
|
Capacity : Count_Type)
|
|
is
|
|
begin
|
|
if Capacity > Container.Capacity then
|
|
raise Capacity_Error with "requested capacity is too large";
|
|
end if;
|
|
end Reserve_Capacity;
|
|
|
|
--------------
|
|
-- Set_Next --
|
|
--------------
|
|
|
|
procedure Set_Next (Node : in out Node_Type; Next : Count_Type) is
|
|
begin
|
|
Node.Next := Next;
|
|
end Set_Next;
|
|
|
|
------------------
|
|
-- Strict_Equal --
|
|
------------------
|
|
|
|
function Strict_Equal (Left, Right : Map) return Boolean is
|
|
CuL : Cursor := First (Left);
|
|
CuR : Cursor := First (Right);
|
|
|
|
begin
|
|
if Length (Left) /= Length (Right) then
|
|
return False;
|
|
end if;
|
|
|
|
while CuL.Node /= 0 or else CuR.Node /= 0 loop
|
|
if CuL.Node /= CuR.Node
|
|
or else
|
|
Left.Nodes (CuL.Node).Element /= Right.Nodes (CuR.Node).Element
|
|
or else Left.Nodes (CuL.Node).Key /= Right.Nodes (CuR.Node).Key
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
CuL := Next (Left, CuL);
|
|
CuR := Next (Right, CuR);
|
|
end loop;
|
|
|
|
return True;
|
|
end Strict_Equal;
|
|
|
|
---------
|
|
-- Vet --
|
|
---------
|
|
|
|
function Vet (Container : Map; Position : Cursor) return Boolean is
|
|
begin
|
|
if Position.Node = 0 then
|
|
return True;
|
|
end if;
|
|
|
|
declare
|
|
X : Count_Type;
|
|
|
|
begin
|
|
if Container.Length = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if Container.Capacity = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if Container.Buckets'Length = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if Position.Node > Container.Capacity then
|
|
return False;
|
|
end if;
|
|
|
|
if Container.Nodes (Position.Node).Next = Position.Node then
|
|
return False;
|
|
end if;
|
|
|
|
X := Container.Buckets
|
|
(Key_Ops.Index (Container, Container.Nodes (Position.Node).Key));
|
|
|
|
for J in 1 .. Container.Length loop
|
|
if X = Position.Node then
|
|
return True;
|
|
end if;
|
|
|
|
if X = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if X = Container.Nodes (X).Next then
|
|
|
|
-- Prevent unnecessary looping
|
|
|
|
return False;
|
|
end if;
|
|
|
|
X := Container.Nodes (X).Next;
|
|
end loop;
|
|
|
|
return False;
|
|
end;
|
|
end Vet;
|
|
|
|
end Ada.Containers.Formal_Hashed_Maps;
|