Re: [Boost-bugs] [Boost C++ Libraries] #2788: boost::uniform_01<> template parameter mistake

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #2788: boost::uniform_01<> template parameter mistake
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-02-21 16:08:27

#2788: boost::uniform_01<> template parameter mistake
--------------------------------------+-------------------------------------
  Reporter:  rick68_at_[hidden]         |       Owner:  steven_watanabe
      Type:  Patches                  |      Status:  closed         
 Milestone:  Boost 1.39.0             |   Component:  random         
   Version:  Boost Development Trunk  |    Severity:  Problem        
Resolution:  invalid                  |    Keywords:                 
--------------------------------------+-------------------------------------
Changes (by steven_watanabe):

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

Comment:

 Yes.  That's expected.  The code shouldn't have compiled before my changes
 either.

 {{{
 #include <boost/random.hpp>

 int main(void) {
     boost::uniform_01<boost::mt19937> rng; // illegal--no default
 constructor

     boost::mt19937 rng;

     // ok.  Old implementation.  Copies rng.
     boost::uniform_01<boost::mt19937> dist(rng);
     double x = dist();

     // ok.  Modification of old implementation.
     // stores a reference to rng.
     boost::uniform_01<boost::mt19937&> dist(rng);
     double x = dist();

     // ok.  new implementation
     boost::uniform_01<> dist;
     double x = dist(rng);

     return 0;
 }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2788#comment:2>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.