[boost] [config] BOOST_NO_SFINAE_EXPR and GCC 4.6.4

Subject: [boost] [config] BOOST_NO_SFINAE_EXPR and GCC 4.6.4
From: Agustín K-ballo Bergé (kaballo86_at_[hidden])
Date: 2013-08-24 21:00:59

According to this table http://gcc.gnu.org/projects/cxx0x.html, GCC 
supports "Solving the SFINAE problem for expressions" since 4.4. 
According to Boost.Config, it is since 4.5. The following test case 
works fine with 4.8.1, but fails miserably with 4.6.4: 
http://ideone.com/RzgXKM
Errors include invalid conversion from X const* to X*, and use of 
non-member-ptr in member-ptr expression. GCC 4.7.3 (tested by zao at 
#boost) shows similar results: https://www.acc.umu.se/~zao/kbsfinae11.txt

Should BOOST_NO_SFINAE_EXPR be adjusted according to the results of this 
test case?

Regards,
-- 
Agustín K-ballo Bergé.-
http://talesofcpp.fusionfenix.com