1197 lines
31 KiB
Ada
1197 lines
31 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 . 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) 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.Unchecked_Deallocation;
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with Ada.Containers.Hash_Tables.Generic_Operations;
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pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Operations);
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with Ada.Containers.Hash_Tables.Generic_Keys;
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pragma Elaborate_All (Ada.Containers.Hash_Tables.Generic_Keys);
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with Ada.Containers.Helpers; use Ada.Containers.Helpers;
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with System; use type System.Address;
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package body Ada.Containers.Hashed_Maps 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 Copy_Node
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(Source : Node_Access) return Node_Access;
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pragma Inline (Copy_Node);
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function Equivalent_Key_Node
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(Key : Key_Type;
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Node : Node_Access) return Boolean;
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pragma Inline (Equivalent_Key_Node);
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procedure Free (X : in out Node_Access);
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function Find_Equal_Key
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(R_HT : Hash_Table_Type;
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L_Node : Node_Access) return Boolean;
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function Hash_Node (Node : Node_Access) return Hash_Type;
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pragma Inline (Hash_Node);
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function Next (Node : Node_Access) return Node_Access;
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pragma Inline (Next);
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function Read_Node
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(Stream : not null access Root_Stream_Type'Class) return Node_Access;
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pragma Inline (Read_Node);
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procedure Set_Next (Node : Node_Access; Next : Node_Access);
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pragma Inline (Set_Next);
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function Vet (Position : Cursor) return Boolean;
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procedure Write_Node
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(Stream : not null access Root_Stream_Type'Class;
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Node : Node_Access);
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pragma Inline (Write_Node);
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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_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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Copy_Node => Copy_Node,
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Free => Free);
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package Key_Ops is new Hash_Tables.Generic_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_Key_Node);
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function Is_Equal is new HT_Ops.Generic_Equal (Find_Equal_Key);
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procedure Read_Nodes is new HT_Ops.Generic_Read (Read_Node);
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procedure Write_Nodes is new HT_Ops.Generic_Write (Write_Node);
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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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return Is_Equal (Left.HT, Right.HT);
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end "=";
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------------
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-- Adjust --
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------------
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procedure Adjust (Container : in out Map) is
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begin
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HT_Ops.Adjust (Container.HT);
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end Adjust;
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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_Item (Node : Node_Access);
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pragma Inline (Insert_Item);
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procedure Insert_Items is new HT_Ops.Generic_Iteration (Insert_Item);
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-----------------
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-- Insert_Item --
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-----------------
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procedure Insert_Item (Node : Node_Access) is
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begin
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Target.Insert (Key => Node.Key, New_Item => Node.Element);
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end Insert_Item;
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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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Target.Clear;
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if Target.Capacity < Source.Length then
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Target.Reserve_Capacity (Source.Length);
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end if;
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Insert_Items (Source.HT);
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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 HT_Ops.Capacity (Container.HT);
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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.HT);
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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 Map;
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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
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"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 map";
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end if;
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pragma Assert
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(Vet (Position),
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"Position cursor in Constant_Reference is bad");
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declare
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HT : Hash_Table_Type renames Container'Unrestricted_Access.all.HT;
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TC : constant Tamper_Counts_Access :=
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HT.TC'Unrestricted_Access;
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begin
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return R : constant Constant_Reference_Type :=
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(Element => Position.Node.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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function Constant_Reference
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(Container : aliased Map;
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Key : Key_Type) return Constant_Reference_Type
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is
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HT : Hash_Table_Type renames Container'Unrestricted_Access.HT;
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Node : constant Node_Access := Key_Ops.Find (HT, Key);
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begin
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if Checks and then Node = null then
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raise Constraint_Error with "key not in map";
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end if;
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declare
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TC : constant Tamper_Counts_Access :=
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HT.TC'Unrestricted_Access;
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begin
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return R : constant Constant_Reference_Type :=
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(Element => Node.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 : 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 : Count_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
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with "Requested capacity is less than Source length";
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end if;
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return Target : Map do
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Target.Reserve_Capacity (C);
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Target.Assign (Source);
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end return;
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end Copy;
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---------------
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-- Copy_Node --
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---------------
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function Copy_Node
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(Source : Node_Access) return Node_Access
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is
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Target : constant Node_Access :=
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new Node_Type'(Key => Source.Key,
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Element => Source.Element,
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Next => null);
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begin
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return Target;
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end Copy_Node;
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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 : Node_Access;
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begin
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Key_Ops.Delete_Key_Sans_Free (Container.HT, Key, X);
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if Checks and then X = null 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 (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 Checks and then Position.Node = null then
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raise Constraint_Error with
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"Position cursor of Delete 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
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"Position cursor of Delete designates wrong map";
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end if;
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TC_Check (Container.HT.TC);
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pragma Assert (Vet (Position), "bad cursor in Delete");
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HT_Ops.Delete_Node_Sans_Free (Container.HT, Position.Node);
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Free (Position.Node);
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Position.Container := null;
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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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HT : Hash_Table_Type renames Container'Unrestricted_Access.HT;
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Node : constant Node_Access := Key_Ops.Find (HT, Key);
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begin
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if Checks and then Node = null 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 Node.Element;
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end Element;
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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 = null then
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raise Constraint_Error with
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"Position cursor of function Element 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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return Position.Node.Element;
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end Element;
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-------------------------
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-- Equivalent_Key_Node --
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-------------------------
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function Equivalent_Key_Node
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(Key : Key_Type;
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Node : Node_Access) return Boolean is
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begin
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return Equivalent_Keys (Key, Node.Key);
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end Equivalent_Key_Node;
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---------------------
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-- Equivalent_Keys --
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---------------------
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function Equivalent_Keys (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 = null then
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raise Constraint_Error with
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"Left cursor of Equivalent_Keys equals No_Element";
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end if;
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if Checks and then Right.Node = null then
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raise Constraint_Error with
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"Right cursor of Equivalent_Keys equals No_Element";
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end if;
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pragma Assert (Vet (Left), "Left cursor of Equivalent_Keys is bad");
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pragma Assert (Vet (Right), "Right cursor of Equivalent_Keys is bad");
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return Equivalent_Keys (Left.Node.Key, Right.Node.Key);
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end Equivalent_Keys;
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function Equivalent_Keys (Left : Cursor; Right : Key_Type) return Boolean is
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begin
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if Checks and then Left.Node = null then
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raise Constraint_Error with
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"Left cursor of Equivalent_Keys equals No_Element";
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end if;
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pragma Assert (Vet (Left), "Left cursor in Equivalent_Keys is bad");
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return Equivalent_Keys (Left.Node.Key, Right);
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end Equivalent_Keys;
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function Equivalent_Keys (Left : Key_Type; Right : Cursor) return Boolean is
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begin
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if Checks and then Right.Node = null then
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raise Constraint_Error with
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"Right cursor of Equivalent_Keys equals No_Element";
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end if;
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pragma Assert (Vet (Right), "Right cursor of Equivalent_Keys is bad");
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return Equivalent_Keys (Left, Right.Node.Key);
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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 : Node_Access;
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begin
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Key_Ops.Delete_Key_Sans_Free (Container.HT, Key, X);
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Free (X);
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end Exclude;
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--------------
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-- Finalize --
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--------------
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procedure Finalize (Container : in out Map) is
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begin
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HT_Ops.Finalize (Container.HT);
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end Finalize;
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procedure Finalize (Object : in out Iterator) is
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begin
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if Object.Container /= null then
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Unbusy (Object.Container.HT.TC);
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end if;
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end Finalize;
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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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HT : Hash_Table_Type renames Container'Unrestricted_Access.HT;
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Node : constant Node_Access := Key_Ops.Find (HT, Key);
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begin
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if Node = null then
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return No_Element;
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end if;
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return Cursor'(Container'Unrestricted_Access, Node);
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end Find;
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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;
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L_Node : Node_Access) return Boolean
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is
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R_Index : constant Hash_Type := Key_Ops.Index (R_HT, L_Node.Key);
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R_Node : Node_Access := R_HT.Buckets (R_Index);
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begin
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while R_Node /= null loop
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if Equivalent_Keys (L_Node.Key, R_Node.Key) then
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return L_Node.Element = R_Node.Element;
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end if;
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R_Node := R_Node.Next;
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end loop;
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return False;
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end Find_Equal_Key;
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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 Node_Access := HT_Ops.First (Container.HT);
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begin
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if Node = null then
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return No_Element;
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end if;
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return Cursor'(Container'Unrestricted_Access, Node);
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end First;
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function First (Object : Iterator) return Cursor is
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begin
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return Object.Container.First;
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end First;
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----------
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-- Free --
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----------
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procedure Free (X : in out Node_Access) is
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procedure Deallocate is
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new Ada.Unchecked_Deallocation (Node_Type, Node_Access);
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begin
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if X /= null then
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X.Next := X; -- detect mischief (in Vet)
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Deallocate (X);
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end if;
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end Free;
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------------------------
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-- Get_Element_Access --
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------------------------
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function Get_Element_Access
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(Position : Cursor) return not null Element_Access is
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begin
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return Position.Node.Element'Access;
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end Get_Element_Access;
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|
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-----------------
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-- Has_Element --
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-----------------
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function Has_Element (Position : Cursor) return Boolean is
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begin
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pragma Assert (Vet (Position), "bad cursor in Has_Element");
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return Position.Node /= null;
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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_Access) 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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|
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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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|
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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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TE_Check (Container.HT.TC);
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Position.Node.Key := Key;
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Position.Node.Element := New_Item;
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end if;
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end Include;
|
|
|
|
------------
|
|
-- Insert --
|
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------------
|
|
|
|
procedure Insert
|
|
(Container : in out Map;
|
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Key : Key_Type;
|
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Position : out Cursor;
|
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Inserted : out Boolean)
|
|
is
|
|
function New_Node (Next : Node_Access) return Node_Access;
|
|
pragma Inline (New_Node);
|
|
|
|
procedure Local_Insert is
|
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new Key_Ops.Generic_Conditional_Insert (New_Node);
|
|
|
|
--------------
|
|
-- New_Node --
|
|
--------------
|
|
|
|
function New_Node (Next : Node_Access) return Node_Access is
|
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begin
|
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return new Node_Type'(Key => Key,
|
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Element => <>,
|
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Next => Next);
|
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end New_Node;
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|
|
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HT : Hash_Table_Type renames Container.HT;
|
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|
|
-- Start of processing for Insert
|
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|
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begin
|
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if HT_Ops.Capacity (HT) = 0 then
|
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HT_Ops.Reserve_Capacity (HT, 1);
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|
end if;
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|
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Local_Insert (HT, Key, Position.Node, Inserted);
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|
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if Inserted
|
|
and then HT.Length > HT_Ops.Capacity (HT)
|
|
then
|
|
HT_Ops.Reserve_Capacity (HT, HT.Length);
|
|
end if;
|
|
|
|
Position.Container := Container'Unrestricted_Access;
|
|
end Insert;
|
|
|
|
procedure Insert
|
|
(Container : in out Map;
|
|
Key : Key_Type;
|
|
New_Item : Element_Type;
|
|
Position : out Cursor;
|
|
Inserted : out Boolean)
|
|
is
|
|
function New_Node (Next : Node_Access) return Node_Access;
|
|
pragma Inline (New_Node);
|
|
|
|
procedure Local_Insert is
|
|
new Key_Ops.Generic_Conditional_Insert (New_Node);
|
|
|
|
--------------
|
|
-- New_Node --
|
|
--------------
|
|
|
|
function New_Node (Next : Node_Access) return Node_Access is
|
|
begin
|
|
return new Node_Type'(Key, New_Item, Next);
|
|
end New_Node;
|
|
|
|
HT : Hash_Table_Type renames Container.HT;
|
|
|
|
-- Start of processing for Insert
|
|
|
|
begin
|
|
if HT_Ops.Capacity (HT) = 0 then
|
|
HT_Ops.Reserve_Capacity (HT, 1);
|
|
end if;
|
|
|
|
Local_Insert (HT, Key, Position.Node, Inserted);
|
|
|
|
if Inserted
|
|
and then HT.Length > HT_Ops.Capacity (HT)
|
|
then
|
|
HT_Ops.Reserve_Capacity (HT, HT.Length);
|
|
end if;
|
|
|
|
Position.Container := Container'Unrestricted_Access;
|
|
end Insert;
|
|
|
|
procedure Insert
|
|
(Container : in out Map;
|
|
Key : Key_Type;
|
|
New_Item : Element_Type)
|
|
is
|
|
Position : Cursor;
|
|
pragma Unreferenced (Position);
|
|
|
|
Inserted : Boolean;
|
|
|
|
begin
|
|
Insert (Container, Key, New_Item, Position, Inserted);
|
|
|
|
if Checks and then not Inserted then
|
|
raise Constraint_Error with
|
|
"attempt to insert key already in map";
|
|
end if;
|
|
end Insert;
|
|
|
|
--------------
|
|
-- Is_Empty --
|
|
--------------
|
|
|
|
function Is_Empty (Container : Map) return Boolean is
|
|
begin
|
|
return Container.HT.Length = 0;
|
|
end Is_Empty;
|
|
|
|
-------------
|
|
-- Iterate --
|
|
-------------
|
|
|
|
procedure Iterate
|
|
(Container : Map;
|
|
Process : not null access procedure (Position : Cursor))
|
|
is
|
|
procedure Process_Node (Node : Node_Access);
|
|
pragma Inline (Process_Node);
|
|
|
|
procedure Local_Iterate is new HT_Ops.Generic_Iteration (Process_Node);
|
|
|
|
------------------
|
|
-- Process_Node --
|
|
------------------
|
|
|
|
procedure Process_Node (Node : Node_Access) is
|
|
begin
|
|
Process (Cursor'(Container'Unrestricted_Access, Node));
|
|
end Process_Node;
|
|
|
|
Busy : With_Busy (Container.HT.TC'Unrestricted_Access);
|
|
|
|
-- Start of processing for Iterate
|
|
|
|
begin
|
|
Local_Iterate (Container.HT);
|
|
end Iterate;
|
|
|
|
function Iterate
|
|
(Container : Map) return Map_Iterator_Interfaces.Forward_Iterator'Class
|
|
is
|
|
begin
|
|
return It : constant Iterator :=
|
|
(Limited_Controlled with Container => Container'Unrestricted_Access)
|
|
do
|
|
Busy (Container.HT.TC'Unrestricted_Access.all);
|
|
end return;
|
|
end Iterate;
|
|
|
|
---------
|
|
-- Key --
|
|
---------
|
|
|
|
function Key (Position : Cursor) return Key_Type is
|
|
begin
|
|
if Checks and then Position.Node = null then
|
|
raise Constraint_Error with
|
|
"Position cursor of function Key equals No_Element";
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in function Key");
|
|
|
|
return Position.Node.Key;
|
|
end Key;
|
|
|
|
------------
|
|
-- Length --
|
|
------------
|
|
|
|
function Length (Container : Map) return Count_Type is
|
|
begin
|
|
return Container.HT.Length;
|
|
end Length;
|
|
|
|
----------
|
|
-- Move --
|
|
----------
|
|
|
|
procedure Move
|
|
(Target : in out Map;
|
|
Source : in out Map)
|
|
is
|
|
begin
|
|
HT_Ops.Move (Target => Target.HT, Source => Source.HT);
|
|
end Move;
|
|
|
|
----------
|
|
-- Next --
|
|
----------
|
|
|
|
function Next (Node : Node_Access) return Node_Access is
|
|
begin
|
|
return Node.Next;
|
|
end Next;
|
|
|
|
function Next (Position : Cursor) return Cursor is
|
|
begin
|
|
if Position.Node = null then
|
|
return No_Element;
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in function Next");
|
|
|
|
declare
|
|
HT : Hash_Table_Type renames Position.Container.HT;
|
|
Node : constant Node_Access := HT_Ops.Next (HT, Position.Node);
|
|
|
|
begin
|
|
if Node = null then
|
|
return No_Element;
|
|
end if;
|
|
|
|
return Cursor'(Position.Container, Node);
|
|
end;
|
|
end Next;
|
|
|
|
procedure Next (Position : in out Cursor) is
|
|
begin
|
|
Position := Next (Position);
|
|
end Next;
|
|
|
|
function Next
|
|
(Object : Iterator;
|
|
Position : Cursor) return Cursor
|
|
is
|
|
begin
|
|
if Position.Container = null then
|
|
return No_Element;
|
|
end if;
|
|
|
|
if Checks and then Position.Container /= Object.Container then
|
|
raise Program_Error with
|
|
"Position cursor of Next designates wrong map";
|
|
end if;
|
|
|
|
return Next (Position);
|
|
end Next;
|
|
|
|
----------------------
|
|
-- Pseudo_Reference --
|
|
----------------------
|
|
|
|
function Pseudo_Reference
|
|
(Container : aliased Map'Class) return Reference_Control_Type
|
|
is
|
|
TC : constant Tamper_Counts_Access :=
|
|
Container.HT.TC'Unrestricted_Access;
|
|
begin
|
|
return R : constant Reference_Control_Type := (Controlled with TC) do
|
|
Lock (TC.all);
|
|
end return;
|
|
end Pseudo_Reference;
|
|
|
|
-------------------
|
|
-- Query_Element --
|
|
-------------------
|
|
|
|
procedure Query_Element
|
|
(Position : Cursor;
|
|
Process : not null access
|
|
procedure (Key : Key_Type; Element : Element_Type))
|
|
is
|
|
begin
|
|
if Checks and then Position.Node = null then
|
|
raise Constraint_Error with
|
|
"Position cursor of Query_Element equals No_Element";
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Query_Element");
|
|
|
|
declare
|
|
M : Map renames Position.Container.all;
|
|
HT : Hash_Table_Type renames M.HT'Unrestricted_Access.all;
|
|
Lock : With_Lock (HT.TC'Unrestricted_Access);
|
|
K : Key_Type renames Position.Node.Key;
|
|
E : Element_Type renames Position.Node.Element;
|
|
begin
|
|
Process (K, E);
|
|
end;
|
|
end Query_Element;
|
|
|
|
----------
|
|
-- Read --
|
|
----------
|
|
|
|
procedure Read
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Container : out Map)
|
|
is
|
|
begin
|
|
Read_Nodes (Stream, Container.HT);
|
|
end Read;
|
|
|
|
procedure Read
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Item : out Cursor)
|
|
is
|
|
begin
|
|
raise Program_Error with "attempt to stream map cursor";
|
|
end Read;
|
|
|
|
procedure Read
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Item : out Reference_Type)
|
|
is
|
|
begin
|
|
raise Program_Error with "attempt to stream reference";
|
|
end Read;
|
|
|
|
procedure Read
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Item : out Constant_Reference_Type)
|
|
is
|
|
begin
|
|
raise Program_Error with "attempt to stream reference";
|
|
end Read;
|
|
|
|
---------------
|
|
-- Reference --
|
|
---------------
|
|
|
|
function Reference
|
|
(Container : aliased in out Map;
|
|
Position : Cursor) return Reference_Type
|
|
is
|
|
begin
|
|
if Checks and then Position.Container = null then
|
|
raise Constraint_Error with
|
|
"Position cursor has no element";
|
|
end if;
|
|
|
|
if Checks and then Position.Container /= Container'Unrestricted_Access
|
|
then
|
|
raise Program_Error with
|
|
"Position cursor designates wrong map";
|
|
end if;
|
|
|
|
pragma Assert
|
|
(Vet (Position),
|
|
"Position cursor in function Reference is bad");
|
|
|
|
declare
|
|
HT : Hash_Table_Type renames Container'Unrestricted_Access.all.HT;
|
|
TC : constant Tamper_Counts_Access :=
|
|
HT.TC'Unrestricted_Access;
|
|
begin
|
|
return R : constant Reference_Type :=
|
|
(Element => Position.Node.Element'Access,
|
|
Control => (Controlled with TC))
|
|
do
|
|
Lock (TC.all);
|
|
end return;
|
|
end;
|
|
end Reference;
|
|
|
|
function Reference
|
|
(Container : aliased in out Map;
|
|
Key : Key_Type) return Reference_Type
|
|
is
|
|
HT : Hash_Table_Type renames Container.HT;
|
|
Node : constant Node_Access := Key_Ops.Find (HT, Key);
|
|
|
|
begin
|
|
if Checks and then Node = null then
|
|
raise Constraint_Error with "key not in map";
|
|
end if;
|
|
|
|
declare
|
|
TC : constant Tamper_Counts_Access :=
|
|
HT.TC'Unrestricted_Access;
|
|
begin
|
|
return R : constant Reference_Type :=
|
|
(Element => Node.Element'Access,
|
|
Control => (Controlled with TC))
|
|
do
|
|
Lock (TC.all);
|
|
end return;
|
|
end;
|
|
end Reference;
|
|
|
|
---------------
|
|
-- Read_Node --
|
|
---------------
|
|
|
|
function Read_Node
|
|
(Stream : not null access Root_Stream_Type'Class) return Node_Access
|
|
is
|
|
Node : Node_Access := new Node_Type;
|
|
|
|
begin
|
|
Key_Type'Read (Stream, Node.Key);
|
|
Element_Type'Read (Stream, Node.Element);
|
|
return Node;
|
|
|
|
exception
|
|
when others =>
|
|
Free (Node);
|
|
raise;
|
|
end Read_Node;
|
|
|
|
-------------
|
|
-- Replace --
|
|
-------------
|
|
|
|
procedure Replace
|
|
(Container : in out Map;
|
|
Key : Key_Type;
|
|
New_Item : Element_Type)
|
|
is
|
|
Node : constant Node_Access := Key_Ops.Find (Container.HT, Key);
|
|
|
|
begin
|
|
if Checks and then Node = null then
|
|
raise Constraint_Error with
|
|
"attempt to replace key not in map";
|
|
end if;
|
|
|
|
TE_Check (Container.HT.TC);
|
|
|
|
Node.Key := Key;
|
|
Node.Element := New_Item;
|
|
end Replace;
|
|
|
|
---------------------
|
|
-- Replace_Element --
|
|
---------------------
|
|
|
|
procedure Replace_Element
|
|
(Container : in out Map;
|
|
Position : Cursor;
|
|
New_Item : Element_Type)
|
|
is
|
|
begin
|
|
if Checks and then Position.Node = null then
|
|
raise Constraint_Error with
|
|
"Position cursor of Replace_Element equals No_Element";
|
|
end if;
|
|
|
|
if Checks and then Position.Container /= Container'Unrestricted_Access
|
|
then
|
|
raise Program_Error with
|
|
"Position cursor of Replace_Element designates wrong map";
|
|
end if;
|
|
|
|
TE_Check (Position.Container.HT.TC);
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Replace_Element");
|
|
|
|
Position.Node.Element := New_Item;
|
|
end Replace_Element;
|
|
|
|
----------------------
|
|
-- Reserve_Capacity --
|
|
----------------------
|
|
|
|
procedure Reserve_Capacity
|
|
(Container : in out Map;
|
|
Capacity : Count_Type)
|
|
is
|
|
begin
|
|
HT_Ops.Reserve_Capacity (Container.HT, Capacity);
|
|
end Reserve_Capacity;
|
|
|
|
--------------
|
|
-- Set_Next --
|
|
--------------
|
|
|
|
procedure Set_Next (Node : Node_Access; Next : Node_Access) is
|
|
begin
|
|
Node.Next := Next;
|
|
end Set_Next;
|
|
|
|
--------------------
|
|
-- Update_Element --
|
|
--------------------
|
|
|
|
procedure Update_Element
|
|
(Container : in out Map;
|
|
Position : Cursor;
|
|
Process : not null access procedure (Key : Key_Type;
|
|
Element : in out Element_Type))
|
|
is
|
|
begin
|
|
if Checks and then Position.Node = null then
|
|
raise Constraint_Error with
|
|
"Position cursor of Update_Element equals No_Element";
|
|
end if;
|
|
|
|
if Checks and then Position.Container /= Container'Unrestricted_Access
|
|
then
|
|
raise Program_Error with
|
|
"Position cursor of Update_Element designates wrong map";
|
|
end if;
|
|
|
|
pragma Assert (Vet (Position), "bad cursor in Update_Element");
|
|
|
|
declare
|
|
HT : Hash_Table_Type renames Container.HT;
|
|
Lock : With_Lock (HT.TC'Unrestricted_Access);
|
|
K : Key_Type renames Position.Node.Key;
|
|
E : Element_Type renames Position.Node.Element;
|
|
begin
|
|
Process (K, E);
|
|
end;
|
|
end Update_Element;
|
|
|
|
---------
|
|
-- Vet --
|
|
---------
|
|
|
|
function Vet (Position : Cursor) return Boolean is
|
|
begin
|
|
if Position.Node = null then
|
|
return Position.Container = null;
|
|
end if;
|
|
|
|
if Position.Container = null then
|
|
return False;
|
|
end if;
|
|
|
|
if Position.Node.Next = Position.Node then
|
|
return False;
|
|
end if;
|
|
|
|
declare
|
|
HT : Hash_Table_Type renames Position.Container.HT;
|
|
X : Node_Access;
|
|
|
|
begin
|
|
if HT.Length = 0 then
|
|
return False;
|
|
end if;
|
|
|
|
if HT.Buckets = null
|
|
or else HT.Buckets'Length = 0
|
|
then
|
|
return False;
|
|
end if;
|
|
|
|
X := HT.Buckets (Key_Ops.Checked_Index (HT, Position.Node.Key));
|
|
|
|
for J in 1 .. HT.Length loop
|
|
if X = Position.Node then
|
|
return True;
|
|
end if;
|
|
|
|
if X = null then
|
|
return False;
|
|
end if;
|
|
|
|
if X = X.Next then -- to prevent unnecessary looping
|
|
return False;
|
|
end if;
|
|
|
|
X := X.Next;
|
|
end loop;
|
|
|
|
return False;
|
|
end;
|
|
end Vet;
|
|
|
|
-----------
|
|
-- Write --
|
|
-----------
|
|
|
|
procedure Write
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Container : Map)
|
|
is
|
|
begin
|
|
Write_Nodes (Stream, Container.HT);
|
|
end Write;
|
|
|
|
procedure Write
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Item : Cursor)
|
|
is
|
|
begin
|
|
raise Program_Error with "attempt to stream map cursor";
|
|
end Write;
|
|
|
|
procedure Write
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Item : Reference_Type)
|
|
is
|
|
begin
|
|
raise Program_Error with "attempt to stream reference";
|
|
end Write;
|
|
|
|
procedure Write
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Item : Constant_Reference_Type)
|
|
is
|
|
begin
|
|
raise Program_Error with "attempt to stream reference";
|
|
end Write;
|
|
|
|
----------------
|
|
-- Write_Node --
|
|
----------------
|
|
|
|
procedure Write_Node
|
|
(Stream : not null access Root_Stream_Type'Class;
|
|
Node : Node_Access)
|
|
is
|
|
begin
|
|
Key_Type'Write (Stream, Node.Key);
|
|
Element_Type'Write (Stream, Node.Element);
|
|
end Write_Node;
|
|
|
|
end Ada.Containers.Hashed_Maps;
|