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#include <tuple>
19#include <type_traits>
20
21template <class T, std::size_t N>
22void test()
23{
24    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
25                                   std::tuple_size<T> >::value), "");
26    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
27                                   std::tuple_size<const T> >::value), "");
28    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
29                                   std::tuple_size<volatile T> >::value), "");
30    static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
31                                   std::tuple_size<const volatile T> >::value), "");
32}
33
34int main()
35{
36    test<std::tuple<>, 0>();
37    test<std::tuple<int>, 1>();
38    test<std::tuple<char, int>, 2>();
39    test<std::tuple<char, char*, int>, 3>();
40}
41