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
23 template <class T, std::size_t N>
test()24 void 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
main()36 int 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