libcxx/test/std/utilities/utility/declval/declval.verify.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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <utility>
  10
  11 // template <class T> typename add_rvalue_reference<T>::type declval() noexcept;
  12
  13 #include <utility>
  14
  15 int x = std::declval<
  16     int>(); // expected-error-re@*:* {{static assertion failed{{.*}}std::declval can only be used in an unevaluated context.}}