On Thu, Jul 30, 2009 at 10:20 AM, Mathias Gaunard<mathias.gaunard@ens-lyon.org> wrote:
It would be very nice if Boost.Config provided the BOOST_NO_SFINAE_EXPR macro, that would be defined if the compiler does not support SFINAE applied to expressions. http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2634.html
GCC supports this feature since 4.4 both for C++03 and C++0x for example.
Yes, such a macro is needed Also, it turns out that the ability to provide a default template parameter for function templates markedly clarifies code using enable_if. (I learned this Howard Hinnant, but I think he may have gotten the idea from Peter Dimov.) Thus we need a BOOST_NO_DEFAULT_TEMPLATE_ARGUMENT_FOR_FUNCTION_TEMPLATE. Or maybe BOOST_NO_FUNCTION_TEMPLATE_DEFAULT_PARAMETER. (or is the correct term "argument"? Need to look that up. I'm overloaded. If you'd like to submit a patch, that would be great. Thanks, --Beman