1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--         A D A . N U M E R I C S . D I S C R E T E _ R A N D O M          --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2010, Free Software Foundation, Inc.         --
10--                                                                          --
11-- This specification is derived from the Ada Reference Manual for use with --
12-- GNAT. The copyright notice above, and the license provisions that follow --
13-- apply solely to the  contents of the part following the private keyword. --
14--                                                                          --
15-- GNAT is free software;  you can  redistribute it  and/or modify it under --
16-- terms of the  GNU General Public License as published  by the Free Soft- --
17-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
18-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
19-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
20-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
21--                                                                          --
22-- As a special exception under Section 7 of GPL version 3, you are granted --
23-- additional permissions described in the GCC Runtime Library Exception,   --
24-- version 3.1, as published by the Free Software Foundation.               --
25--                                                                          --
26-- You should have received a copy of the GNU General Public License and    --
27-- a copy of the GCC Runtime Library Exception along with this program;     --
28-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
29-- <http://www.gnu.org/licenses/>.                                          --
30--                                                                          --
31-- GNAT was originally developed  by the GNAT team at  New York University. --
32-- Extensive contributions were provided by Ada Core Technologies Inc.      --
33--                                                                          --
34------------------------------------------------------------------------------
35
36--  Note: the implementation used in this package is a version of the
37--  Mersenne Twister. See s-rannum.adb for details and references.
38
39with System.Random_Numbers;
40
41generic
42   type Result_Subtype is (<>);
43
44package Ada.Numerics.Discrete_Random is
45
46   --  Basic facilities
47
48   type Generator is limited private;
49
50   function Random (Gen : Generator) return Result_Subtype;
51
52   procedure Reset (Gen : Generator; Initiator : Integer);
53   procedure Reset (Gen : Generator);
54
55   --  Advanced facilities
56
57   type State is private;
58
59   procedure Save  (Gen : Generator; To_State   : out State);
60   procedure Reset (Gen : Generator; From_State : State);
61
62   Max_Image_Width : constant := System.Random_Numbers.Max_Image_Width;
63
64   function Image (Of_State    : State)  return String;
65   function Value (Coded_State : String) return State;
66
67private
68
69   type Generator is new System.Random_Numbers.Generator;
70
71   type State is new System.Random_Numbers.State;
72
73end Ada.Numerics.Discrete_Random;
74