Re: [boost] [config] defining __has_extension in suffix.hpp?

It's useful to have

#ifndef __has_feature #define __has_feature(x) 0 #endif

#ifndef __has_extension #define __has_extension __has_feature #endif

in suffix.hpp so that one can then use __has_extension(foo) everywhere without fear. Otherwise, even

#if defined(__clang__) && defined(__has_extension) && __has_extension(foo)

is a preprocessor error when __has_extension is not defined (which it isn't when not on Clang.)

Good point. However, aren't those reserved symbols? If we're being pedantic.... John.