From 53a420fba21cf1644972b34dcd811a43cdb8368d Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Mon, 2 Jan 2017 19:18:58 +0000
Subject: Vendor import of libc++ trunk r290819:
 https://llvm.org/svn/llvm-project/libcxx/trunk@290819

---
 .../tuple.tuple/tuple.helper/tuple_size.pass.cpp   | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp')

diff --git a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp
index 49b4215a1956..40214f632e75 100644
--- a/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp
+++ b/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size.pass.cpp
@@ -18,19 +18,36 @@
 // UNSUPPORTED: c++98, c++03
 
 #include <tuple>
+#include <utility>
+#include <array>
 #include <type_traits>
 
+template <class T, class = decltype(std::tuple_size<T>::value)>
+constexpr bool has_value(int) { return true; }
+template <class> constexpr bool has_value(long) { return false; }
+template <class T> constexpr bool has_value() { return has_value<T>(0); }
+
+
 template <class T, std::size_t N>
 void test()
 {
+    static_assert(has_value<T>(), "");
     static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
                                    std::tuple_size<T> >::value), "");
+    static_assert(has_value<const T>(), "");
     static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
                                    std::tuple_size<const T> >::value), "");
+    static_assert(has_value<volatile T>(), "");
     static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
                                    std::tuple_size<volatile T> >::value), "");
+
+    static_assert(has_value<const volatile T>(), "");
     static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
                                    std::tuple_size<const volatile T> >::value), "");
+    {
+        static_assert(!has_value<T &>(), "");
+        static_assert(!has_value<T *>(), "");
+    }
 }
 
 int main()
@@ -39,4 +56,13 @@ int main()
     test<std::tuple<int>, 1>();
     test<std::tuple<char, int>, 2>();
     test<std::tuple<char, char*, int>, 3>();
+    test<std::pair<int, void*>, 2>();
+    test<std::array<int, 42>, 42>();
+    {
+        static_assert(!has_value<void>(), "");
+        static_assert(!has_value<void*>(), "");
+        static_assert(!has_value<int>(), "");
+        static_assert(!has_value<std::pair<int, int>*>(), "");
+        static_assert(!has_value<std::array<int, 42>&>(), "");
+    }
 }
-- 
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