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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT LIBRARY COMPONENTS                          --
   4 --                                                                          --
   5 --            A D A . C O N T A I N E R S . H A S H _ T A B L E S           --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2004-2011, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- This unit was originally developed by Matthew J Heaney.                  --
  28 ------------------------------------------------------------------------------
  29
  30 --  This package declares the hash-table type used to implement hashed
  31 --  containers.
  32
  33 package Ada.Containers.Hash_Tables is
  34    pragma Pure;
  35    --  Declare Pure so this can be imported by Remote_Types packages
  36
  37    generic
  38       type Node_Type (<>) is limited private;
  39
  40       type Node_Access is access Node_Type;
  41
  42    package Generic_Hash_Table_Types is
  43       type Buckets_Type is array (Hash_Type range <>) of Node_Access;
  44
  45       type Buckets_Access is access all Buckets_Type;
  46       for Buckets_Access'Storage_Size use 0;
  47       --  Storage_Size of zero so this package can be Pure
  48
  49       type Hash_Table_Type is tagged record
  50          Buckets : Buckets_Access;
  51          Length  : Count_Type := 0;
  52          Busy    : Natural    := 0;
  53          Lock    : Natural    := 0;
  54       end record;
  55    end Generic_Hash_Table_Types;
  56
  57    generic
  58       type Node_Type is private;
  59    package Generic_Bounded_Hash_Table_Types is
  60       type Nodes_Type is array (Count_Type range <>) of Node_Type;
  61       type Buckets_Type is array (Hash_Type range <>) of Count_Type;
  62
  63       type Hash_Table_Type
  64         (Capacity : Count_Type;
  65          Modulus  : Hash_Type) is
  66       tagged record
  67          Length  : Count_Type                  := 0;
  68          Busy    : Natural                     := 0;
  69          Lock    : Natural                     := 0;
  70          Free    : Count_Type'Base             := -1;
  71          Nodes   : Nodes_Type (1 .. Capacity)  := (others => <>);
  72          Buckets : Buckets_Type (1 .. Modulus) := (others => 0);
  73       end record;
  74    end Generic_Bounded_Hash_Table_Types;
  75
  76 end Ada.Containers.Hash_Tables;