Re: [Boost-bugs] [Boost C++ Libraries] #4847: tweaking the memoized fibonnacci to produce > 40 number give strange results

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4847: tweaking the memoized fibonnacci to produce > 40 number give strange results
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-11-13 10:31:09

#4847: tweaking the memoized fibonnacci to produce > 40 number give strange
results
----------------------------------------------------------+-----------------
  Reporter:  sylvain foubert <sylvain.foubert@…>          |       Owner:  joaquin          
      Type:  Bugs                                         |      Status:  closed           
 Milestone:  To Be Determined                             |   Component:  flyweight        
   Version:  Boost 1.44.0                                 |    Severity:  Problem          
Resolution:  invalid                                      |    Keywords:  example fibonacci
----------------------------------------------------------+-----------------
Changes (by joaquin):

  * status:  new => closed
  * resolution:  => invalid

Comment:

 Hi Sylvain,

 Looks like in your platform `unsigned long` is 32 bits, and since F(48) >
 2^32^ you're incurring overflow, hence the bogus results.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4847#comment:1>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.