Give tuple a constexpr default constructor.

llvm-svn: 159857

1 files changed, 14 insertions, 0 deletions

diff --git a/libcxx/test/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp b/libcxx/test/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp
index eb902ac683b..84ecd8d2cd1 100644
--- a/libcxx/test/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp
+++ b/libcxx/test/utilities/tuple/tuple.tuple/tuple.cnstr/default.pass.cpp
@@ -46,4 +46,18 @@ int main()
         assert(std::get<2>(t) == "");
         assert(std::get<3>(t) == DefaultOnly());
     }
+#ifndef _LIBCPP_HAS_NO_CONSTEXPR
+    {
+        constexpr std::tuple<> t;
+    }
+    {
+        constexpr std::tuple<int> t;
+        assert(std::get<0>(t) == 0);
+    }
+    {
+        constexpr std::tuple<int, char*> t;
+        assert(std::get<0>(t) == 0);
+        assert(std::get<1>(t) == nullptr);
+    }
+#endif
 }