gcc/ada/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) 1992-2010, 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 is
  33
  34    package SRN renames System.Random_Numbers;
  35    use SRN;
  36
  37    -----------
  38    -- Image --
  39    -----------
  40
  41    function Image (Of_State : State) return String is
  42    begin
  43       return Image (SRN.State (Of_State));
  44    end Image;
  45
  46    ------------
  47    -- Random --
  48    ------------
  49
  50    function Random (Gen : Generator) return Uniformly_Distributed is
  51    begin
  52       return Random (SRN.Generator (Gen));
  53    end Random;
  54
  55    -----------
  56    -- Reset --
  57    -----------
  58
  59    --  Version that works from calendar
  60
  61    procedure Reset (Gen : Generator) is
  62    begin
  63       Reset (SRN.Generator (Gen));
  64    end Reset;
  65
  66    --  Version that works from given initiator value
  67
  68    procedure Reset (Gen : Generator; Initiator : Integer) is
  69    begin
  70       Reset (SRN.Generator (Gen), Initiator);
  71    end Reset;
  72
  73    --  Version that works from specific saved state
  74
  75    procedure Reset (Gen : Generator; From_State : State) is
  76    begin
  77       Reset (SRN.Generator (Gen), From_State);
  78    end Reset;
  79
  80    ----------
  81    -- Save --
  82    ----------
  83
  84    procedure Save  (Gen : Generator; To_State : out State) is
  85    begin
  86       Save (SRN.Generator (Gen), To_State);
  87    end Save;
  88
  89    -----------
  90    -- Value --
  91    -----------
  92
  93    function Value (Coded_State : String) return State is
  94       G : SRN.Generator;
  95       S : SRN.State;
  96    begin
  97       Reset (G, Coded_State);
  98       Save (G, S);
  99       return State (S);
 100    end Value;
 101
 102 end Ada.Numerics.Float_Random;