[PATCH] [libcxx] SFINAE-friendly common_type

[Agustín Bergé]

================
Comment at: include/type_traits:216
@@ -215,3 +215,3 @@
 template <class...> 
 struct __void_t { typedef void type; };
 #endif
----------------
This patch seems to be the first to make use of `__void_t`. I would rather have this named `__void` instead as it is not an alias, would that name potentially clash?

================
Comment at: include/type_traits:1489
@@ +1488,3 @@
+
+template <class ...Tp> struct __common_types;
+
----------------
Here `__common_types` is used merely to carry a pack of types, very much like the existing `__tuple_types`. Perhaps a generic one could be introduced to replace both uses.

http://reviews.llvm.org/D6964

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