[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
llvm-svn: 372983
diff --git a/libcxx/src/mutex.cpp b/libcxx/src/mutex.cpp
index 1827857..7e979cd 100644
--- a/libcxx/src/mutex.cpp
+++ b/libcxx/src/mutex.cpp
@@ -21,9 +21,9 @@
_LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_HAS_NO_THREADS
-const defer_lock_t defer_lock = {};
-const try_to_lock_t try_to_lock = {};
-const adopt_lock_t adopt_lock = {};
+const defer_lock_t defer_lock{};
+const try_to_lock_t try_to_lock{};
+const adopt_lock_t adopt_lock{};
// ~mutex is defined elsewhere
