| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <tuple> |
| |
| // template <class... Types> class tuple; |
| |
| // template <class... Types> |
| // class tuple_size<tuple<Types...>> |
| // : public integral_constant<size_t, sizeof...(Types)> { }; |
| // |
| // LWG #2212 says that tuple_size and tuple_element must be |
| // available after including <utility> |
| |
| #include <cstddef> |
| #include <utility> |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| |
| template <class T, std::size_t N, class U, size_t idx> |
| void test() |
| { |
| static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
| std::tuple_size<T> >::value), ""); |
| static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
| std::tuple_size<const T> >::value), ""); |
| static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
| std::tuple_size<volatile T> >::value), ""); |
| static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, |
| std::tuple_size<const volatile T> >::value), ""); |
| static_assert((std::is_same<typename std::tuple_element<idx, T>::type, U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element<idx, const T>::type, const U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element<idx, volatile T>::type, volatile U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element<idx, const volatile T>::type, const volatile U>::value), ""); |
| } |
| |
| int main(int, char**) |
| { |
| test<std::pair<int, int>, 2, int, 0>(); |
| test<std::pair<int, int>, 2, int, 1>(); |
| test<std::pair<const int, int>, 2, int, 1>(); |
| test<std::pair<int, volatile int>, 2, volatile int, 1>(); |
| test<std::pair<char *, int>, 2, char *, 0>(); |
| test<std::pair<char *, int>, 2, int, 1>(); |
| |
| return 0; |
| } |