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

1 files changed, 66 insertions, 0 deletions

diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.pass.cpp
new file mode 100644
index 0000000000000..e21768cb6f5fd
--- /dev/null
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const.pass.cpp
@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+//   typename tuple_element<I, tuple<Types...> >::type const&
+//   get(const tuple<Types...>& t);
+
+// UNSUPPORTED: c++98, c++03
+
+#include <tuple>
+#include <string>
+#include <cassert>
+
+struct Empty {};
+
+int main()
+{
+    {
+        typedef std::tuple<int> T;
+        const T t(3);
+        assert(std::get<0>(t) == 3);
+    }
+    {
+        typedef std::tuple<std::string, int> T;
+        const T t("high", 5);
+        assert(std::get<0>(t) == "high");
+        assert(std::get<1>(t) == 5);
+    }
+#if _LIBCPP_STD_VER > 11 
+    {
+        typedef std::tuple<double, int> T;
+        constexpr T t(2.718, 5);
+        static_assert(std::get<0>(t) == 2.718, "");
+        static_assert(std::get<1>(t) == 5, "");
+    }
+    {
+        typedef std::tuple<Empty> T;
+        constexpr T t{Empty()};
+        constexpr Empty e = std::get<0>(t);
+        ((void)e); // Prevent unused warning
+    }
+#endif
+    {
+        typedef std::tuple<double&, std::string, int> T;
+        double d = 1.5;
+        const T t(d, "high", 5);
+        assert(std::get<0>(t) == 1.5);
+        assert(std::get<1>(t) == "high");
+        assert(std::get<2>(t) == 5);
+        std::get<0>(t) = 2.5;
+        assert(std::get<0>(t) == 2.5);
+        assert(std::get<1>(t) == "high");
+        assert(std::get<2>(t) == 5);
+        assert(d == 2.5);
+    }
+}