gcc/ada/libgnat/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) 1992-2018, 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
  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;