Summary: Avoid buffer overflow by replacing the pointer interface with an array reference interface in C++2a. Tentatively ready on Batavia2018. https://wg21.link/lwg2499 https://wg21.link/p0487 Reviewers: mclow.lists, ldionne, EricWF Reviewed By: ldionne Subscribers: libcxx-commits, cfe-commits, christof Differential Revision: https://reviews.llvm.org/D51268 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@347377 91177308-0d34-0410-b5e6-96231b3b80d8