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 <class... Types> 15 // class tuple_size<tuple<Types...>> 16 // : public integral_constant<size_t, sizeof...(Types)> { }; 17 18 #include <tuple> 19 #include <type_traits> 20 21 template <class T, std::size_t N> 22 void test() 23 { 24 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 25 std::tuple_size<T> >::value), ""); 26 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 27 std::tuple_size<const T> >::value), ""); 28 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 29 std::tuple_size<volatile T> >::value), ""); 30 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 31 std::tuple_size<const volatile T> >::value), ""); 32 } 33 34 int main() 35 { 36 test<std::tuple<>, 0>(); 37 test<std::tuple<int>, 1>(); 38 test<std::tuple<char, int>, 2>(); 39 test<std::tuple<char, char*, int>, 3>(); 40 } 41
