tree 36613ace2fda9939010fd3c12f75c927eeadaddf
parent b0651b603e9aaa6d532ce72f6fcac98e88d10fe0
author Louis Dionne <ldionne@apple.com> 1569509470 +0000
committer Louis Dionne <ldionne@apple.com> 1569509470 +0000

[libc++] Take 2: Implement LWG 2510

Summary:
LWG2510 makes tag types like allocator_arg_t explicitly default
constructible instead of implicitly default constructible. It also
makes the constructors for std::pair and std::tuple conditionally
explicit based on the explicit-ness of the default constructibility
for the pair/tuple's elements.

This was previously committed as r372777 and reverted in r372832 due to
the commit breaking LLVM's build in C++14 mode. This issue has now been
addressed.

Reviewers: mclow.lists

Subscribers: christof, jkorous, dexonsmith, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D65161

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@372983 91177308-0d34-0410-b5e6-96231b3b80d8