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// <tuple>
11
12// template <class... Types> class tuple;
13
14// template <class... Types>
15//   class tuple_size<tuple<Types...>>
16//     : public integral_constant<size_t, sizeof...(Types)> { };
17
18// UNSUPPORTED: c++98, c++03
19
20#include <tuple>
21#include <type_traits>
22
23template <class T, std::size_t N>
24void test()
25{
26    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
27                                   std::tuple_size<T> >::value), "");
28    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
29                                   std::tuple_size<const T> >::value), "");
30    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
31                                   std::tuple_size<volatile T> >::value), "");
32    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
33                                   std::tuple_size<const volatile T> >::value), "");
34}
35
36int main()
37{
38    test<std::tuple<>, 0>();
39    test<std::tuple<int>, 1>();
40    test<std::tuple<char, int>, 2>();
41    test<std::tuple<char, char*, int>, 3>();
42}
43