commit 8bcf92aad2e5f1a39b6b59612a34b6e36207a2c0
author Louis Dionne <ldionne@apple.com> Tue Sep 24 20:22:34 2019
committer Louis Dionne <ldionne@apple.com> Tue Sep 24 20:22:34 2019
tree 9203c3d6cbb5f14b0ca319aef2236570b779ec91
parent 3d85029503b16a8f1dde1349cc15f669f6f820e8

[libc++] Implement LWG 3158

Summary:
LWG 3158 marks the allocator_arg_t constructor of std::tuple as
conditionnally explicit based on whether the default constructors
of the tuple's members are explicitly default constructible.

Reviewers: EricWF, mclow.lists

Subscribers: christof, jkorous, dexonsmith, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D65232

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@372778 91177308-0d34-0410-b5e6-96231b3b80d8