52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <tuple>
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// template <class... Types> class tuple;
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// template <size_t I, class... Types>
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// class tuple_element<I, tuple<Types...> >
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// {
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// public:
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// typedef Ti type;
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// };
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// UNSUPPORTED: c++98, c++03
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#include <tuple>
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#include <type_traits>
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#include "test_macros.h"
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template <class T, std::size_t N, class U>
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void test()
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{
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static_assert((std::is_same<typename std::tuple_element<N, T>::type, U>::value), "");
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static_assert((std::is_same<typename std::tuple_element<N, const T>::type, const U>::value), "");
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static_assert((std::is_same<typename std::tuple_element<N, volatile T>::type, volatile U>::value), "");
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static_assert((std::is_same<typename std::tuple_element<N, const volatile T>::type, const volatile U>::value), "");
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#if TEST_STD_VER > 11
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static_assert((std::is_same<typename std::tuple_element_t<N, T>, U>::value), "");
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static_assert((std::is_same<typename std::tuple_element_t<N, const T>, const U>::value), "");
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static_assert((std::is_same<typename std::tuple_element_t<N, volatile T>, volatile U>::value), "");
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static_assert((std::is_same<typename std::tuple_element_t<N, const volatile T>, const volatile U>::value), "");
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#endif
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}
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int main()
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{
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test<std::tuple<int>, 0, int>();
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test<std::tuple<char, int>, 0, char>();
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test<std::tuple<char, int>, 1, int>();
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test<std::tuple<int*, char, int>, 0, int*>();
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test<std::tuple<int*, char, int>, 1, char>();
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test<std::tuple<int*, char, int>, 2, int>();
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}
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