http://d.puremagic.com/issues/show_bug.cgi?id=1831

           Summary: Random seeding appears not to work
           Product: D
           Version: 2.010
          Platform: PC
               URL: http://www.digitalmars.com/d/2.0/phobos/std_random.html
        OS/Version: Windows
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: ig405@zepler.net


unpredictableSeed always returns the same value, across multiple runs and when run in a loop.

seeding with rand() instead should in theory work, but my Random is always returning the same sequence across multiple program runs. I have tried all the methods in the documentation (see url) to no avail so I'd like to know if anyone else has issues with this.

import std.random;
class Die{
  Random rnd;
  int value;
  int maxValue
  ...

  this()
  {
    ...
    Random rnd = Random(<seed>);
    roll();
  }
  int roll()
  {
    value = rnd.next() % maxValue;
    return value;
  }
}


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http://d.puremagic.com/issues/show_bug.cgi?id=1831


andrei@metalanguage.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




------- Comment #1 from andrei@metalanguage.com  2008-02-13 12:43 -------
unpredictableSeed works properly (except that it will be changed to return uint instead of ulong in the next releast). You should just change your constructor to:

this()
  {
    ...
    rnd = Random(<seed>);
    roll();
  }

so it doesn't define an automatic variable of the same name as the member.


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