id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
3516,lagged fibonacci cannot be seeded with a value 0 - fails with assertion error,Paul H. Isaacson <paul.isaacson@…>,No-Maintainer,"When using the lagged_fibonacci607 and attempting to seed, the attached test program will either stop with an assertion error at line 57 of boost/random/linear_congruential.hpp, or if -DNDEBUG is used during compilation to disable assertions, the returned values are not in range.

Seeding with a zero value should not cause such problems.


{{{
#include <stdlib.h>
#include <stdio.h>
#include <boost/random/lagged_fibonacci.hpp>

using namespace std;

boost::lagged_fibonacci607 lfrand;

inline int fastrand (int range)
{
  return ((int) range * lfrand());
}

main (int argc, char **argv)
{
   unsigned int seed;

   if (argc < 2)
   {
     printf (""Usage lftest <seed>\n"");
     exit (1);
   }

   sscanf (argv[1], ""%d"", &seed);
   printf (""using seed value %d\n"", seed);

   lfrand.seed (seed);

   for (int n = 0; n < 1000000; n++)
   {
     int x = fastrand (10);
     if (x < 0 || x > 9)
       printf (""out of range random number[%d] = %d\n"", n, x);
   }
}
}}}
",Bugs,closed,Boost 1.41.0,random,Boost 1.40.0,Problem,fixed,lagged fibonacci seed 0,