1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <tuple> 11 12 // template <class... Types> class tuple; 13 14 // template <size_t I, class... Types> 15 // class tuple_element<I, tuple<Types...> > 16 // { 17 // public: 18 // typedef Ti type; 19 // }; 20 // 21 // LWG #2212 says that tuple_size and tuple_element must be 22 // available after including <utility> 23 24 #include <array> 25 #include <type_traits> 26 27 template <class T, std::size_t N, class U, size_t idx> 28 void test() 29 { 30 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 31 std::tuple_size<T> >::value), ""); 32 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 33 std::tuple_size<const T> >::value), ""); 34 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 35 std::tuple_size<volatile T> >::value), ""); 36 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 37 std::tuple_size<const volatile T> >::value), ""); 38 static_assert((std::is_same<typename std::tuple_element<idx, T>::type, U>::value), ""); 39 static_assert((std::is_same<typename std::tuple_element<idx, const T>::type, const U>::value), ""); 40 static_assert((std::is_same<typename std::tuple_element<idx, volatile T>::type, volatile U>::value), ""); 41 static_assert((std::is_same<typename std::tuple_element<idx, const volatile T>::type, const volatile U>::value), ""); 42 } 43 44 int main() 45 { 46 test<std::array<int, 5>, 5, int, 0>(); 47 test<std::array<int, 5>, 5, int, 1>(); 48 test<std::array<const char *, 4>, 4, const char *, 3>(); 49 test<std::array<volatile int, 4>, 4, volatile int, 3>(); 50 test<std::array<char *, 3>, 3, char *, 1>(); 51 test<std::array<char *, 3>, 3, char *, 2>(); 52 } 53
