30 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// <utility>10 11// template <class T> typename add_rvalue_reference<T>::type declval() noexcept;12 13#include <utility>14#include <type_traits>15 16#include "test_macros.h"17 18class A19{20 A(const A&);21 A& operator=(const A&);22};23 24int main(int, char**)25{26 static_assert((std::is_same<decltype(std::declval<A>()), A&&>::value), "");27 28 return 0;29}30