File : a-nuflra.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . N U M E R I C S . F L O A T _ R A N D O M --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2015, 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 -- --
19 -- --
20 -- --
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
32 package body Ada.Numerics.Float_Random with
33 SPARK_Mode => Off
34 is
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 Uniformly_Distributed is
53 begin
54 return Random (SRN.Generator (Gen));
55 end Random;
56
57 -----------
58 -- Reset --
59 -----------
60
61 -- Version that works from calendar
62
63 procedure Reset (Gen : Generator) is
64 begin
65 Reset (SRN.Generator (Gen));
66 end Reset;
67
68 -- Version that works from given initiator value
69
70 procedure Reset (Gen : Generator; Initiator : Integer) is
71 begin
72 Reset (SRN.Generator (Gen), Initiator);
73 end Reset;
74
75 -- Version that works from specific saved state
76
77 procedure Reset (Gen : Generator; From_State : State) is
78 begin
79 Reset (SRN.Generator (Gen), From_State);
80 end Reset;
81
82 ----------
83 -- Save --
84 ----------
85
86 procedure Save (Gen : Generator; To_State : out State) is
87 begin
88 Save (SRN.Generator (Gen), To_State);
89 end Save;
90
91 -----------
92 -- Value --
93 -----------
94
95 function Value (Coded_State : String) return State is
96 G : SRN.Generator;
97 S : SRN.State;
98 begin
99 Reset (G, Coded_State);
100 Save (G, S);
101 return State (S);
102 end Value;
103
104 end Ada.Numerics.Float_Random;