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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: what's wrong with random
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Date: 2002-12-22T20:56:31+00:00
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see@messagebody.com (Jan) writes:

> On Sun, 22 Dec 2002 18:38:33 GMT, Robert A Duff
> <bobduff@shell01.TheWorld.com> wrote:
> 
> >I think you want the generator to be global to Generate_FileName.
> >Otherwise, it will be reinitialized each time Generate_FileName
> >is called.
> >
> >- Bob
> 
> What do you mean? Can you give an example?

This is what I mean:

with Ada.Text_IO, Ada.Numerics.Discrete_Random;
use  Ada.Text_IO;

procedure Random_Test is 

   valid_chars : String :=
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
                     & "0123456789!�$%&()=@+-;_#";  

   subtype Int_Slice is Integer range valid_chars'range;
   package My_Random is new Ada.Numerics.Discrete_Random (Int_Slice);

   G      : My_Random.Generator;  

   function Generate_FileName (Length : Positive) return String is 
      I      : Int_Slice;  
      Result : String (1 .. Length);  
   begin
      for X in 1..Length
            loop
         I := My_Random.Random(G);
         Result(X) := valid_chars(I);
      end loop;
      return Result;
   end Generate_FileName;

begin
   My_Random.Reset(G);

   for X in 1..10
   loop
      Put_Line(Generate_Filename(8));
   end loop;

end Random_Test;