File : a-nuflra.ads
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 -- S p e c --
8 -- --
9 -- Copyright (C) 1992-2015, 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 -- --
23 -- --
24 -- --
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
39 with System.Random_Numbers;
40
41 package Ada.Numerics.Float_Random with
42 SPARK_Mode => Off
43 is
44
45 -- Basic facilities
46
47 type Generator is limited private;
48
49 subtype Uniformly_Distributed is Float range 0.0 .. 1.0;
50
51 function Random (Gen : Generator) return Uniformly_Distributed;
52
53 procedure Reset (Gen : Generator);
54 procedure Reset (Gen : Generator; Initiator : Integer);
55
56 -- Advanced facilities
57
58 type State is private;
59
60 procedure Save (Gen : Generator; To_State : out State);
61 procedure Reset (Gen : Generator; From_State : State);
62
63 Max_Image_Width : constant := System.Random_Numbers.Max_Image_Width;
64
65 function Image (Of_State : State) return String;
66 function Value (Coded_State : String) return State;
67
68 private
69
70 type Generator is new System.Random_Numbers.Generator;
71
72 type State is new System.Random_Numbers.State;
73
74 end Ada.Numerics.Float_Random;