gcc/ada/a-nudira.adb

   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) 1992-2010, 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.Discrete_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 Result_Subtype is
  51       function Random is
  52         new SRN.Random_Discrete (Result_Subtype, Result_Subtype'First);
  53    begin
  54       return Random (SRN.Generator (Gen));
  55    end Random;
  56
  57    -----------
  58    -- Reset --
  59    -----------
  60
  61    procedure Reset (Gen : Generator) is
  62    begin
  63       Reset (SRN.Generator (Gen));
  64    end Reset;
  65
  66    procedure Reset (Gen : Generator; Initiator : Integer) is
  67    begin
  68       Reset (SRN.Generator (Gen), Initiator);
  69    end Reset;
  70
  71    procedure Reset (Gen : Generator; From_State : State) is
  72    begin
  73       Reset (SRN.Generator (Gen), SRN.State (From_State));
  74    end Reset;
  75
  76    ----------
  77    -- Save --
  78    ----------
  79
  80    procedure Save (Gen : Generator; To_State   : out State) is
  81    begin
  82       Save (SRN.Generator (Gen), SRN.State (To_State));
  83    end Save;
  84
  85    -----------
  86    -- Value --
  87    -----------
  88
  89    function Value (Coded_State : String) return State is
  90    begin
  91       return State (SRN.State'(Value (Coded_State)));
  92    end Value;
  93
  94 end Ada.Numerics.Discrete_Random;