1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // UNSUPPORTED: c++98, c++03, c++11
11 
12 // <experimental/tuple>
13 
14 // template <class T> constexpr size_t tuple_size_v = tuple_size<T>::value;
15 
16 #include <experimental/tuple>
17 #include <utility>
18 #include <array>
19 
20 namespace ex = std::experimental;
21 
22 template <class Tuple, int Expect>
test()23 void test()
24 {
25     static_assert(ex::tuple_size_v<Tuple> == Expect, "");
26     static_assert(ex::tuple_size_v<Tuple> == std::tuple_size<Tuple>::value, "");
27     static_assert(ex::tuple_size_v<Tuple const> == std::tuple_size<Tuple>::value, "");
28     static_assert(ex::tuple_size_v<Tuple volatile> == std::tuple_size<Tuple>::value, "");
29     static_assert(ex::tuple_size_v<Tuple const volatile> == std::tuple_size<Tuple>::value, "");
30 }
31 
main()32 int main()
33 {
34     test<std::tuple<>, 0>();
35 
36     test<std::tuple<int>, 1>();
37     test<std::array<int, 1>, 1>();
38 
39     test<std::tuple<int, int>, 2>();
40     test<std::pair<int, int>, 2>();
41     test<std::array<int, 2>, 2>();
42 
43     test<std::tuple<int, int, int>, 3>();
44     test<std::array<int, 3>, 3>();
45 }
46