[Boost-bugs] [Boost C++ Libraries] #2787: boost::random::detail::uniform_int_float constructor

Subject: [Boost-bugs] [Boost C++ Libraries] #2787: boost::random::detail::uniform_int_float constructor
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-02-21 11:08:20

#2787: boost::random::detail::uniform_int_float constructor
------------------------------+---------------------------------------------
 Reporter:  rick68_at_[hidden]  |       Owner:  steven_watanabe
     Type:  Patches           |      Status:  new            
Milestone:  Boost 1.39.0      |   Component:  random         
  Version:  Boost 1.38.0      |    Severity:  Problem        
 Keywords:                    |  
------------------------------+---------------------------------------------
 Hi,

 In <boost/random/detail/uniform_int_float.hpp>

 line32:  uniform_int_float(base_type rng, IntType min_arg = 0, IntType
 max_arg = 0xffffffff)[[BR]]
 line33:    : _rng(rng), _min(min_arg), _max(max_arg)[[BR]]
 line34:  {[[BR]]
 line35:    init();[[BR]]
 line36:  }[[BR]]

 line68:  void init()[[BR]]
 line69:  {[[BR]]
 line70:    _range = static_cast<base_result>(_max-_min)+1;[[BR]]
 line71:  }[[BR]]

 If IntType is "unsigned long" and "min_arg = 0", "max_arg = 0xffffffff";
 after call constructor, _range will be zero.
 Becouse "0 + 0xffffffff + 1" is 0, so when we call operator() anytime, it
 always return 0.
 Is it normal?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2787>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.