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

Subject: [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 12:20:29

#5279: [Foreach] Compile-time const rvalue detection fails with gcc 4.6
-------------------------------------+--------------------------------------
 Reporter:  mimomorin@…              |       Owner:  eric_niebler
     Type:  Patches                  |      Status:  new         
Milestone:  To Be Determined         |   Component:  foreach     
  Version:  Boost Development Trunk  |    Severity:  Problem     
 Keywords:                           |  
-------------------------------------+--------------------------------------
 Recently, gcc 4.6 changed the behavior of rvalue conversions (from
 gcc-4.6-20110305).
 You can see the related info here:
 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47851


 This breaks compile-time const rvalue detection in Boost.Foreach;
 Const rvalues are incorrectly treated as lvalues, and so a segmentation
 fault occurs in the following code:

 {{{
 #include <list>
 #include <boost/foreach.hpp>

 typedef const std::list<int> clist;

 int main (int argc, char* argv[])
 {
     BOOST_FOREACH(int x, clist(3)) {}
     return 0;
 }
 }}}

 Though gcc 4.6 is not yet released, I think this behavior is highly likely
 to happen in the release version. So I reported this problem here.

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