Vadim Zhukov wrote: > While working on getting Boost & its friends work under Clang, > I've stumbled upon the code that looks like the following: > > decltype(x, y) z = w;
why not espie's fix from earlier? >>>> but clang++ has variadic macros, like C99... the following patch allows macro decltype() to work a lot more like builtin __decltype in pre-C++11 (note that still works with -std=c++98 -pedantic, much to my surprise, but which is cool) Index: __config =================================================================== RCS file: /cvs/src/lib/libcxx/include/__config,v retrieving revision 1.3 diff -u -p -r1.3 __config --- __config 19 Sep 2016 22:17:22 -0000 1.3 +++ __config 5 May 2017 15:21:58 -0000 @@ -670,7 +670,7 @@ template <unsigned> struct __static_asse #ifdef _LIBCPP_HAS_NO_DECLTYPE // GCC 4.6 provides __decltype in all standard modes. #if !__is_identifier(__decltype) || _GNUC_VER >= 406 -# define decltype(__x) __decltype(__x) +# define decltype(__x, ...) __decltype(__x, ##__VA_ARGS__) #else # define decltype(__x) __typeof__(__x) #endif
