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 // UNSUPPORTED: c++98, c++03 19 20 #include <tuple> 21 #include <type_traits> 22 23 template <class T, std::size_t N> 24 void test() 25 { 26 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 27 std::tuple_size<T> >::value), ""); 28 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 29 std::tuple_size<const T> >::value), ""); 30 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 31 std::tuple_size<volatile T> >::value), ""); 32 static_assert((std::is_base_of<std::integral_constant<std::size_t, N>, 33 std::tuple_size<const volatile T> >::value), ""); 34 } 35 36 int main() 37 { 38 test<std::tuple<>, 0>(); 39 test<std::tuple<int>, 1>(); 40 test<std::tuple<char, int>, 2>(); 41 test<std::tuple<char, char*, int>, 3>(); 42 } 43
