Re: [Boost-bugs] [Boost C++ Libraries] #3446: [boost] [fusion] transform does not return a mutable view

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3446: [boost] [fusion] transform does not return a mutable view
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-09-21 18:13:34

#3446: [boost] [fusion] transform does not return a mutable view
--------------------------------+-------------------------------------------
 Reporter:  jhellrung@…         |       Owner:  djowel      
     Type:  Feature Requests    |      Status:  new         
Milestone:  Boost 1.41.0        |   Component:  fusion      
  Version:  Boost 1.40.0        |    Severity:  Optimization
 Keywords:                      |  
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Comment(by Jeffrey Hellrung <jhellrung@…>):

 I'm not sure I understand your question, but here's an attempt at an
 answer ;)

 If you have a function, e.g., that takes any Boost.Fusion conforming
 sequence as a parameter, and whose return type or intermediate types must
 be deduced from the types in the sequence, it is often convenient to use
 the Boost.MPL metafunctions on this type sequence.  However, although all
 the containers in the Boost.Fusion library are (conveniently, via an
 include) conforming MPL sequences, a Boost.Fusion conforming sequence is
 not generally required to be a Boost.MPL conforming sequence (think
 boost::array), so the use of Boost.MPL metafunctions on the type sequence
 generally requires a conversion to a Boost.MPL vector (or other Boost.MPL
 sequence).

 Thanks for the code reference.  I still need to find some downtime to add
 these proposals to the current Boost.Fusion version :/

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3446#comment:13>
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