Re: [Boost-bugs] [Boost C++ Libraries] #3225: boost::fusion sequence throws compiler error when used with boost::mpl::is_sequence

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3225: boost::fusion sequence throws compiler error when used with boost::mpl::is_sequence
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-06-27 00:49:38

#3225: boost::fusion sequence throws compiler error when used with
boost::mpl::is_sequence
---------------------------------------------------+------------------------
 Reporter:  Jeffrey Hellrung <jhellrung@…>         |       Owner:  djowel 
     Type:  Bugs                                   |      Status:  new    
Milestone:  Boost 1.40.0                           |   Component:  fusion 
  Version:  Boost 1.39.0                           |    Severity:  Problem
 Keywords:  fusion mpl is_sequence                 |  
---------------------------------------------------+------------------------

Comment(by djowel):

 You should probably ask the MPL authors. The thing is:
 boost::mpl::is_sequence is
 not a requirement to be a valid MPL sequence:

     http://www.boost.org/doc/libs/1_39_0/libs/mpl/doc/refmanual/forward-

 sequence.html

 as for fold and find_if, you need to provide a test case, add another trac
 ticket for those.

 I would suggest though to work initially with mpl sequences and only
 convert to a fusion sequence (e.g using fusion::as_vector) only when
 necessary. Fusion sequences have more overhead compared with mpl sequences
 because of its runtime aspects.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3225#comment:2>
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