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.creation/tie.pass.cpp

@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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<class... Types>
+//   tuple<Types&...> tie(Types&... t);
+
+#include <tuple>
+#include <string>
+#include <cassert>
+
+int main()
+{
+    {
+        int i = 0;
+        std::string s;
+        std::tie(i, std::ignore, s) = std::make_tuple(42, 3.14, "C++");
+        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
+}