[PATCH] [libcxx] SFINAE-friendly common_type

[Agustín Bergé]

Hi mclow.lists, EricWF,

Implement a SFINAE-friendly `common_type` as per LWG2408 for the variadic case, and fixes the no-variadic case to work with `void` as per LWG1255.

http://reviews.llvm.org/D6964

Files:
  include/type_traits
  test/std/utilities/meta/meta.trans/meta.trans.other/common_type.pass.cpp

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