Re: [Boost-bugs] [Boost C++ Libraries] #7503: for_each does not compile with g++-4.7.1

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7503: for_each does not compile with g++-4.7.1
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-10-15 05:34:54

#7503: for_each does not compile with g++-4.7.1
------------------------------------------+---------------------------------
  Reporter:  veso <vveesskkoo@…>          |       Owner:  djowel 
      Type:  Bugs                         |      Status:  closed 
 Milestone:  Boost 1.52.0                 |   Component:  fusion 
   Version:  Boost 1.51.0                 |    Severity:  Problem
Resolution:  fixed                        |    Keywords:         
------------------------------------------+---------------------------------
Changes (by djowel):

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

Comment:

 Better wrap your expression in an mpl::lambda to avoid eager evaluation
 (typename Pair_T::first_type). Here's how you do it:

     typedef is_same_key< double, boost::mpl::_1> expr;
     typedef boost::mpl::lambda<expr>::type func;
     fusion::for_each( fusion::filter_if<func>(map_sequence),
 print_ftor());

 See http://www.mywikinet.com/mpl/paper/html/lambda.html for details.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7503#comment:1>
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