Implement LWG issue 2301: Mark std::tie as constexpr

llvm-svn: 202158

1 files changed, 9 insertions, 0 deletions

diff --git a/libcxx/test/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp b/libcxx/test/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp
index 112ee39a367..e6ebf958e6f 100644
--- a/libcxx/test/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp
+++ b/libcxx/test/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp
@@ -27,4 +27,13 @@ int main()
         assert(i == 42);
         assert(s == "C++");
     }
+#if _LIBCPP_STD_VER > 11
+    {
+        static constexpr int i = 42;
+        static constexpr double f = 1.1;
+        constexpr std::tuple<const int &, const double &> t = std::tie(i, f);
+        static_assert ( std::get<0>(t) == 42, "" );
+        static_assert ( std::get<1>(t) == 1.1, "" );
+    }
+#endif
 }