Re: [Boost-bugs] [Boost C++ Libraries] #5279: [Foreach] Compile-time const rvalue detection fails with gcc 4.6

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5279: [Foreach] Compile-time const rvalue detection fails with gcc 4.6
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-03-08 17:05:29

#5279: [Foreach] Compile-time const rvalue detection fails with gcc 4.6
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  Reporter:  mimomorin@…              |       Owner:  eric_niebler
      Type:  Patches                  |      Status:  assigned    
 Milestone:  Boost 1.47.0             |   Component:  foreach     
   Version:  Boost Development Trunk  |    Severity:  Problem     
Resolution:                           |    Keywords:              
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Comment (by mimomorin@…):

 Yeah, with the C++0x features (`-std=c++0x`), we can easily detect
 rvalueness.
 Personally, I use the following code for rvalue detection

 {{{
 #ifndef BOOST_NO_DECLTYPE

 #define BOOST_IS_LVALUE(xxx) boost::is_lvalue_reference<decltype( (xxx)
 )>::value
 #define BOOST_IS_RVALUE(xxx) (!BOOST_IS_LVALUE(xxx))

 #endif
 }}}

 Is it better to develop a method that only needs rvalue reference support
 (i.e. without using the decltype feature)?

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5279#comment:2>
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