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 // <variant> 11 // UNSUPPORTED: c++98, c++03, c++11, c++14 12 13 14 // template <size_t I, class T> struct variant_alternative; // undefined 15 // template <size_t I, class T> struct variant_alternative<I, const T>; 16 // template <size_t I, class T> struct variant_alternative<I, volatile T>; 17 // template <size_t I, class T> struct variant_alternative<I, const volatile T>; 18 // template <size_t I, class T> 19 // using variant_alternative_t = typename variant_alternative<I, T>::type; 20 // 21 // template <size_t I, class... Types> 22 // struct variant_alternative<I, variant<Types...>>; 23 24 25 #include <variant> 26 #include <cassert> 27 28 29 int main() 30 { 31 { 32 typedef std::variant<int, double> T; 33 std::variant_alternative<2, T>::type foo; // expected-note {{requested here}} 34 // expected-error@variant:* {{static_assert failed "Index out of bounds in std::variant_alternative<>"}} 35 } 36 } 37
