51 lines
2.1 KiB
C++
51 lines
2.1 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 <class... Types>
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// class tuple_size<tuple<Types...>>
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// : public integral_constant<size_t, sizeof...(Types)> { };
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//
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// LWG #2212 says that tuple_size and tuple_element must be
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// available after including <utility>
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#include <cstddef>
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#include <utility>
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#include <type_traits>
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template <class T, std::size_t N, class U, size_t idx>
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void test()
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{
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<T> >::value), "");
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<const T> >::value), "");
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<volatile T> >::value), "");
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static_assert((std::is_base_of<std::integral_constant<std::size_t, N>,
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std::tuple_size<const volatile T> >::value), "");
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static_assert((std::is_same<typename std::tuple_element<idx, T>::type, U>::value), "");
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static_assert((std::is_same<typename std::tuple_element<idx, const T>::type, const U>::value), "");
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static_assert((std::is_same<typename std::tuple_element<idx, volatile T>::type, volatile U>::value), "");
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static_assert((std::is_same<typename std::tuple_element<idx, const volatile T>::type, const volatile U>::value), "");
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}
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int main()
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{
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test<std::pair<int, int>, 2, int, 0>();
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test<std::pair<int, int>, 2, int, 1>();
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test<std::pair<const int, int>, 2, int, 1>();
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test<std::pair<int, volatile int>, 2, volatile int, 1>();
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test<std::pair<char *, int>, 2, char *, 0>();
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test<std::pair<char *, int>, 2, int, 1>();
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}
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