1 files changed, 241 insertions, 0 deletions
diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
new file mode 100644
index 0000000000000..770edcaca5e19
--- /dev/null
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.creation/tuple_cat.pass.cpp
@@ -0,0 +1,241 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls);
+
+// UNSUPPORTED: c++98, c++03
+
+#include <tuple>
+#include <utility>
+#include <array>
+#include <string>
+#include <cassert>
+
+#include "MoveOnly.h"
+
+int main()
+{
+    {
+        std::tuple<> t = std::tuple_cat();
+        ((void)t); // Prevent unused warning
+    }
+    {
+        std::tuple<> t1;
+        std::tuple<> t2 = std::tuple_cat(t1);
+        ((void)t2); // Prevent unused warning
+    }
+    {
+        std::tuple<> t = std::tuple_cat(std::tuple<>());
+        ((void)t); // Prevent unused warning
+    }
+    {
+        std::tuple<> t = std::tuple_cat(std::array<int, 0>());
+        ((void)t); // Prevent unused warning
+    }
+    {
+        std::tuple<int> t1(1);
+        std::tuple<int> t = std::tuple_cat(t1);
+        assert(std::get<0>(t) == 1);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+        constexpr std::tuple<> t = std::tuple_cat();
+        ((void)t); // Prevent unused warning
+    }
+    {
+        constexpr std::tuple<> t1;
+        constexpr std::tuple<> t2 = std::tuple_cat(t1);
+        ((void)t2); // Prevent unused warning
+    }
+    {
+        constexpr std::tuple<> t = std::tuple_cat(std::tuple<>());
+        ((void)t); // Prevent unused warning
+    }
+    {
+        constexpr std::tuple<> t = std::tuple_cat(std::array<int, 0>());
+        ((void)t); // Prevent unused warning
+    }
+    {
+        constexpr std::tuple<int> t1(1);
+        constexpr std::tuple<int> t = std::tuple_cat(t1);
+        static_assert(std::get<0>(t) == 1, "");
+    }
+    {
+        constexpr std::tuple<int> t1(1);
+        constexpr std::tuple<int, int> t = std::tuple_cat(t1, t1);
+        static_assert(std::get<0>(t) == 1, "");
+        static_assert(std::get<1>(t) == 1, "");
+    }
+#endif
+    {
+        std::tuple<int, MoveOnly> t =
+                                std::tuple_cat(std::tuple<int, MoveOnly>(1, 2));
+        assert(std::get<0>(t) == 1);
+        assert(std::get<1>(t) == 2);
+    }
+    {
+        std::tuple<int, int, int> t = std::tuple_cat(std::array<int, 3>());
+        assert(std::get<0>(t) == 0);
+        assert(std::get<1>(t) == 0);
+        assert(std::get<2>(t) == 0);
+    }
+    {
+        std::tuple<int, MoveOnly> t = std::tuple_cat(std::pair<int, MoveOnly>(2, 1));
+        assert(std::get<0>(t) == 2);
+        assert(std::get<1>(t) == 1);
+    }
+
+    {
+        std::tuple<> t1;
+        std::tuple<> t2;
+        std::tuple<> t3 = std::tuple_cat(t1, t2);
+        ((void)t3); // Prevent unused warning
+    }
+    {
+        std::tuple<> t1;
+        std::tuple<int> t2(2);
+        std::tuple<int> t3 = std::tuple_cat(t1, t2);
+        assert(std::get<0>(t3) == 2);
+    }
+    {
+        std::tuple<> t1;
+        std::tuple<int> t2(2);
+        std::tuple<int> t3 = std::tuple_cat(t2, t1);
+        assert(std::get<0>(t3) == 2);
+    }
+    {
+        std::tuple<int*> t1;
+        std::tuple<int> t2(2);
+        std::tuple<int*, int> t3 = std::tuple_cat(t1, t2);
+        assert(std::get<0>(t3) == nullptr);
+        assert(std::get<1>(t3) == 2);
+    }
+    {
+        std::tuple<int*> t1;
+        std::tuple<int> t2(2);
+        std::tuple<int, int*> t3 = std::tuple_cat(t2, t1);
+        assert(std::get<0>(t3) == 2);
+        assert(std::get<1>(t3) == nullptr);
+    }
+    {
+        std::tuple<int*> t1;
+        std::tuple<int, double> t2(2, 3.5);
+        std::tuple<int*, int, double> t3 = std::tuple_cat(t1, t2);
+        assert(std::get<0>(t3) == nullptr);
+        assert(std::get<1>(t3) == 2);
+        assert(std::get<2>(t3) == 3.5);
+    }
+    {
+        std::tuple<int*> t1;
+        std::tuple<int, double> t2(2, 3.5);
+        std::tuple<int, double, int*> t3 = std::tuple_cat(t2, t1);
+        assert(std::get<0>(t3) == 2);
+        assert(std::get<1>(t3) == 3.5);
+        assert(std::get<2>(t3) == nullptr);
+    }
+    {
+        std::tuple<int*, MoveOnly> t1(nullptr, 1);
+        std::tuple<int, double> t2(2, 3.5);
+        std::tuple<int*, MoveOnly, int, double> t3 =
+                                              std::tuple_cat(std::move(t1), t2);
+        assert(std::get<0>(t3) == nullptr);
+        assert(std::get<1>(t3) == 1);
+        assert(std::get<2>(t3) == 2);
+        assert(std::get<3>(t3) == 3.5);
+    }
+    {
+        std::tuple<int*, MoveOnly> t1(nullptr, 1);
+        std::tuple<int, double> t2(2, 3.5);
+        std::tuple<int, double, int*, MoveOnly> t3 =
+                                              std::tuple_cat(t2, std::move(t1));
+        assert(std::get<0>(t3) == 2);
+        assert(std::get<1>(t3) == 3.5);
+        assert(std::get<2>(t3) == nullptr);
+        assert(std::get<3>(t3) == 1);
+    }
+    {
+        std::tuple<MoveOnly, MoveOnly> t1(1, 2);
+        std::tuple<int*, MoveOnly> t2(nullptr, 4);
+        std::tuple<MoveOnly, MoveOnly, int*, MoveOnly> t3 =
+                                   std::tuple_cat(std::move(t1), std::move(t2));
+        assert(std::get<0>(t3) == 1);
+        assert(std::get<1>(t3) == 2);
+        assert(std::get<2>(t3) == nullptr);
+        assert(std::get<3>(t3) == 4);
+    }
+
+    {
+        std::tuple<MoveOnly, MoveOnly> t1(1, 2);
+        std::tuple<int*, MoveOnly> t2(nullptr, 4);
+        std::tuple<MoveOnly, MoveOnly, int*, MoveOnly> t3 =
+                                   std::tuple_cat(std::tuple<>(),
+                                                  std::move(t1),
+                                                  std::move(t2));
+        assert(std::get<0>(t3) == 1);
+        assert(std::get<1>(t3) == 2);
+        assert(std::get<2>(t3) == nullptr);
+        assert(std::get<3>(t3) == 4);
+    }
+    {
+        std::tuple<MoveOnly, MoveOnly> t1(1, 2);
+        std::tuple<int*, MoveOnly> t2(nullptr, 4);
+        std::tuple<MoveOnly, MoveOnly, int*, MoveOnly> t3 =
+                                   std::tuple_cat(std::move(t1),
+                                                  std::tuple<>(),
+                                                  std::move(t2));
+        assert(std::get<0>(t3) == 1);
+        assert(std::get<1>(t3) == 2);
+        assert(std::get<2>(t3) == nullptr);
+        assert(std::get<3>(t3) == 4);
+    }
+    {
+        std::tuple<MoveOnly, MoveOnly> t1(1, 2);
+        std::tuple<int*, MoveOnly> t2(nullptr, 4);
+        std::tuple<MoveOnly, MoveOnly, int*, MoveOnly> t3 =
+                                   std::tuple_cat(std::move(t1),
+                                                  std::move(t2),
+                                                  std::tuple<>());
+        assert(std::get<0>(t3) == 1);
+        assert(std::get<1>(t3) == 2);
+        assert(std::get<2>(t3) == nullptr);
+        assert(std::get<3>(t3) == 4);
+    }
+    {
+        std::tuple<MoveOnly, MoveOnly> t1(1, 2);
+        std::tuple<int*, MoveOnly> t2(nullptr, 4);
+        std::tuple<MoveOnly, MoveOnly, int*, MoveOnly, int> t3 =
+                                   std::tuple_cat(std::move(t1),
+                                                  std::move(t2),
+                                                  std::tuple<int>(5));
+        assert(std::get<0>(t3) == 1);
+        assert(std::get<1>(t3) == 2);
+        assert(std::get<2>(t3) == nullptr);
+        assert(std::get<3>(t3) == 4);
+        assert(std::get<4>(t3) == 5);
+    }
+    {
+        // See bug #19616.
+        auto t1 = std::tuple_cat(
+            std::make_tuple(std::make_tuple(1)),
+            std::make_tuple()
+        );
+        assert(t1 == std::make_tuple(std::make_tuple(1)));
+
+        auto t2 = std::tuple_cat(
+            std::make_tuple(std::make_tuple(1)),
+            std::make_tuple(std::make_tuple(2))
+        );
+        assert(t2 == std::make_tuple(std::make_tuple(1), std::make_tuple(2)));
+    }
+}