1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <tuple>
10
11 // template <class... Types> class tuple;
12
13 // template <class... Types>
14 // class tuple_size<tuple<Types...>>
15 // : public integral_constant<size_t, sizeof...(Types)> { };
16
17 // UNSUPPORTED: c++03
18
19 #include <tuple>
20 #include <type_traits>
21
22 #include "test_macros.h"
23
24 template <class T, std::size_t N>
test()25 void test()
26 {
27 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
28 std::tuple_size<T> >::value), "");
29 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
30 std::tuple_size<const T> >::value), "");
31 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
32 std::tuple_size<volatile T> >::value), "");
33 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
34 std::tuple_size<const volatile T> >::value), "");
35 }
36
main(int,char **)37 int main(int, char**)
38 {
39 test<std::tuple<>, 0>();
40 test<std::tuple<int>, 1>();
41 test<std::tuple<char, int>, 2>();
42 test<std::tuple<char, char*, int>, 3>();
43
44 return 0;
45 }
46