[PATCH] D31515: [libc++] Implement LWG 2911 - add an is_aggregate type-trait

[Eric Fiselier via Phabricator via cfe-commits]

EricWF created this revision.

This patch implements http://cplusplus.github.io/LWG/lwg-defects.html#2911.

I'm putting this up for review until __is_aggregate is added to clang (See https://reviews.llvm.org/D31513)


https://reviews.llvm.org/D31515

Files:
  include/__config
  include/type_traits
  test/libcxx/utilities/meta/meta.unary/meta.unary.prop/missing_is_aggregate_trait.fail.cpp
  test/std/utilities/meta/meta.unary/meta.unary.prop/is_aggregate.pass.cpp
  www/cxx1z_status.html

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