id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
4847,tweaking the memoized fibonnacci to produce > 40 number give strange results,sylvain foubert <sylvain.foubert@…>,Joaquín M López Muñoz,"I changed the integer type for numbers from int to unsigned long for higher precision and I got erroneous computed values after F(47) :

F(46)=1836311903
F(47)=2971215073
F(48)=512559680
F(49)=3483774753


{{{
typedef flyweight<key_value<unsigned long,compute_fibonacci>,no_tracking> fibonacci;

struct compute_fibonacci:private boost::noncopyable
{
  compute_fibonacci(unsigned long n):
    result(n==0?0:n==1?1:fibonacci(n-2).get()+fibonacci(n-1).get())
  {}

  operator unsigned long()const{return result;}
  unsigned long result;
};

}}}


Internal bug or unprecautious use of the API ?",Bugs,closed,To Be Determined,flyweight,Boost 1.44.0,Problem,invalid,example fibonacci,