Add constexpr to pair
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D80558
Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 737a4501e815d8dd57e5095dbbbede500dfa8ccb
diff --git a/include/tuple b/include/tuple
index 1f80b70..c3c7db5 100644
--- a/include/tuple
+++ b/include/tuple
@@ -1393,7 +1393,7 @@
template <class _T1, class _T2>
template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
pair<_T1, _T2>::pair(piecewise_construct_t,
tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
__tuple_indices<_I1...>, __tuple_indices<_I2...>)