[libcxx-commits] [PATCH] D63574: Implement P0340R3: Make `underlying_type` SFINAE-friendly

[Eric Fiselier via Phabricator via libcxx-commits]

EricWF requested changes to this revision.
EricWF added inline comments.
This revision now requires changes to proceed.


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Comment at: libcxx/include/type_traits:4729
 
+template <class _Tp, bool = is_enum<_Tp>::value> struct underlying_type;
+
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This changes the mangling of `underlying_type`, and potentially it's usage as a "template template". 
The specialization trick should be done in a impl base class.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D63574/new/

https://reviews.llvm.org/D63574