Implement LWG issue 2301: Mark std::tie as constexpr
llvm-svn: 202158
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 0d1560e10e79f2d75a8fe09b07e40218d84f0ae5
diff --git a/include/tuple b/include/tuple
index 24e086d..30a958a 100644
--- a/include/tuple
+++ b/include/tuple
@@ -74,7 +74,7 @@
template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14
template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
-template <class... T> tuple<T&...> tie(T&...) noexcept;
+template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
// 20.4.1.4, tuple helper classes:
@@ -796,7 +796,7 @@
// tie
template <class ..._Tp>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple<_Tp&...>
tie(_Tp&... __t) _NOEXCEPT
{