33 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++1410 11// <variant>12 13// template <size_t I, class T> struct variant_alternative; // undefined14// template <size_t I, class T> struct variant_alternative<I, const T>;15// template <size_t I, class T> struct variant_alternative<I, volatile T>;16// template <size_t I, class T> struct variant_alternative<I, const volatile T>;17// template <size_t I, class T>18// using variant_alternative_t = typename variant_alternative<I, T>::type;19//20// template <size_t I, class... Types>21// struct variant_alternative<I, variant<Types...>>;22 23#include <memory>24#include <type_traits>25#include <variant>26 27int main(int, char**) {28 using V = std::variant<int, void *, const void *, long double>;29 std::variant_alternative<4, V>::type foo; // expected-error@variant:* {{Index out of bounds in std::variant_alternative<>}}30 31 return 0;32}33