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--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2020, 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-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32package body Ada.Numerics.Discrete_Random with
33  SPARK_Mode => Off
34is
35
36   package SRN renames System.Random_Numbers;
37   use SRN;
38
39   -----------
40   -- Image --
41   -----------
42
43   function Image (Of_State : State) return String is
44   begin
45      return Image (SRN.State (Of_State));
46   end Image;
47
48   ------------
49   -- Random --
50   ------------
51
52   function Random (Gen : Generator) return Result_Subtype is
53      function Random is
54        new SRN.Random_Discrete (Result_Subtype, Result_Subtype'First);
55   begin
56      return Random (SRN.Generator (Gen));
57   end Random;
58
59   function Random
60     (Gen   : Generator;
61      First : Result_Subtype;
62      Last  : Result_Subtype) return Result_Subtype
63   is
64      subtype Local_Subtype is Result_Subtype range First .. Last;
65      function Random is new SRN.Random_Discrete (Local_Subtype, First);
66   begin
67      return Random (SRN.Generator (Gen));
68   end Random;
69
70   -----------
71   -- Reset --
72   -----------
73
74   procedure Reset (Gen : Generator) is
75   begin
76      Reset (SRN.Generator (Gen));
77   end Reset;
78
79   procedure Reset (Gen : Generator; Initiator : Integer) is
80   begin
81      Reset (SRN.Generator (Gen), Initiator);
82   end Reset;
83
84   procedure Reset (Gen : Generator; From_State : State) is
85   begin
86      Reset (SRN.Generator (Gen), SRN.State (From_State));
87   end Reset;
88
89   ----------
90   -- Save --
91   ----------
92
93   procedure Save (Gen : Generator; To_State   : out State) is
94   begin
95      Save (SRN.Generator (Gen), SRN.State (To_State));
96   end Save;
97
98   -----------
99   -- Value --
100   -----------
101
102   function Value (Coded_State : String) return State is
103   begin
104      return State (SRN.State'(Value (Coded_State)));
105   end Value;
106
107end Ada.Numerics.Discrete_Random;
108