[Boost-bugs] [Boost C++ Libraries] #8148: mpl::is_lambda_expression bug

Subject: [Boost-bugs] [Boost C++ Libraries] #8148: mpl::is_lambda_expression bug
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-02-22 23:03:46

#8148: mpl::is_lambda_expression bug
---------------------------------------------------------+------------------
 Reporter:  James Hirschorn <James.Hirschorn@…>          |       Owner:  agurtovoy
     Type:  Bugs                                         |      Status:  new      
Milestone:  To Be Determined                             |   Component:  mpl      
  Version:  Boost 1.53.0                                 |    Severity:  Problem  
 Keywords:  is_lambda_expression                         |  
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 The metafunction boost::mpl::is_lambda_expression does not work correctly.

 My attached code example give a metafunction class for which
 is_lambda_expression evaluates as false.

 While is_lambda_expression is not a documented feature of boost::mpl, it
 is available in the boost::mpl namespace. Moreover, it is used in the
 implementation of boost::mpl::transform, and presumably results in
 unintended behaviour there.

 The package boost::tti (in the boost/trunk) has
 boost::tti::detail::is_lambda_expression. I have confirmed that this works
 correctly on my example (see attached file). The tti author has informed
 me that tti depends on mpl. Perhaps then, boost::mpl::is_lambda_expression
 should be replaced by tti's.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/8148>
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