vendor/libc++/libc++-release_370-r246257

1 files changed, 49 insertions, 0 deletions

diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
new file mode 100644
index 0000000000000..42e4fab88ffa2
--- /dev/null
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
@@ -0,0 +1,49 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <tuple>
+
+// template <class... Types> class tuple;
+
+// template <size_t I, class... Types>
+// class tuple_element<I, tuple<Types...> >
+// {
+// public:
+//     typedef Ti type;
+// };
+
+// UNSUPPORTED: c++98, c++03
+
+#include <tuple>
+#include <type_traits>
+
+template <class T, std::size_t N, class U>
+void test()
+{
+    static_assert((std::is_same<typename std::tuple_element<N, T>::type, U>::value), "");
+    static_assert((std::is_same<typename std::tuple_element<N, const T>::type, const U>::value), "");
+    static_assert((std::is_same<typename std::tuple_element<N, volatile T>::type, volatile U>::value), "");
+    static_assert((std::is_same<typename std::tuple_element<N, const volatile T>::type, const volatile U>::value), "");
+#if _LIBCPP_STD_VER > 11
+    static_assert((std::is_same<typename std::tuple_element_t<N, T>, U>::value), "");
+    static_assert((std::is_same<typename std::tuple_element_t<N, const T>, const U>::value), "");
+    static_assert((std::is_same<typename std::tuple_element_t<N, volatile T>, volatile U>::value), "");
+    static_assert((std::is_same<typename std::tuple_element_t<N, const volatile T>, const volatile U>::value), "");
+#endif
+}
+
+int main()
+{
+    test<std::tuple<int>, 0, int>();
+    test<std::tuple<char, int>, 0, char>();
+    test<std::tuple<char, int>, 1, int>();
+    test<std::tuple<int*, char, int>, 0, int*>();
+    test<std::tuple<int*, char, int>, 1, char>();
+    test<std::tuple<int*, char, int>, 2, int>();
+}