| //===----------------------------------------------------------------------===// |
| // |
| // 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 <size_t I, class... Types> |
| // struct tuple_element<I, tuple<Types...> > |
| // { |
| // typedef Ti type; |
| // }; |
| |
| // UNSUPPORTED: c++98, c++03 |
| |
| #include <tuple> |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| |
| template <class T, std::size_t N, class U> |
| void test() |
| { |
| static_assert((std::is_same<typename std::tuple_element<N, T>::type, U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element<N, const T>::type, const U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element<N, volatile T>::type, volatile U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element<N, const volatile T>::type, const volatile U>::value), ""); |
| #if TEST_STD_VER > 11 |
| static_assert((std::is_same<typename std::tuple_element_t<N, T>, U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element_t<N, const T>, const U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element_t<N, volatile T>, volatile U>::value), ""); |
| static_assert((std::is_same<typename std::tuple_element_t<N, const volatile T>, const volatile U>::value), ""); |
| #endif |
| } |
| |
| int main(int, char**) |
| { |
| test<std::tuple<int>, 0, int>(); |
| test<std::tuple<char, int>, 0, char>(); |
| test<std::tuple<char, int>, 1, int>(); |
| test<std::tuple<int*, char, int>, 0, int*>(); |
| test<std::tuple<int*, char, int>, 1, char>(); |
| test<std::tuple<int*, char, int>, 2, int>(); |
| |
| return 0; |
| } |