Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/utilities/tuple/tuple.tuple/tuple.elem/get_non_const.pass.cpp

@@ -0,0 +1,81 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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&
+//   get(tuple<Types...>& t);
+
+#include <tuple>
+#include <string>
+#include <cassert>
+
+#if __cplusplus > 201103L
+
+struct Empty {};
+
+struct S {
+   std::tuple<int, Empty> a;
+   int k;
+   Empty e;
+   constexpr S() : a{1,Empty{}}, k(std::get<0>(a)), e(std::get<1>(a)) {}
+   };
+
+constexpr std::tuple<int, int> getP () { return { 3, 4 }; }
+#endif
+
+int main()
+{
+    {
+        typedef std::tuple<int> T;
+        T t(3);
+        assert(std::get<0>(t) == 3);
+        std::get<0>(t) = 2;
+        assert(std::get<0>(t) == 2);
+    }
+    {
+        typedef std::tuple<std::string, int> T;
+        T t("high", 5);
+        assert(std::get<0>(t) == "high");
+        assert(std::get<1>(t) == 5);
+        std::get<0>(t) = "four";
+        std::get<1>(t) = 4;
+        assert(std::get<0>(t) == "four");
+        assert(std::get<1>(t) == 4);
+    }
+    {
+        typedef std::tuple<double&, std::string, int> T;
+        double d = 1.5;
+        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;
+        std::get<1>(t) = "four";
+        std::get<2>(t) = 4;
+        assert(std::get<0>(t) == 2.5);
+        assert(std::get<1>(t) == "four");
+        assert(std::get<2>(t) == 4);
+        assert(d == 2.5);
+    }
+#if _LIBCPP_STD_VER > 11 
+    { // get on an rvalue tuple
+        static_assert ( std::get<0> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 0, "" );
+        static_assert ( std::get<1> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 1, "" );
+        static_assert ( std::get<2> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 2, "" );
+        static_assert ( std::get<3> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 3, "" );
+        static_assert(S().k == 1, "");
+        static_assert(std::get<1>(getP()) == 4, "");
+    }
+#endif
+
+}