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
20namespace ex = std::experimental;
21
22template <class Tuple, int Expect>
23void 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
32int 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