1// -*- C++ -*-
 2//===----------------------------------------------------------------------===//
 3//
 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 5// See https://llvm.org/LICENSE.txt for license information.
 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 7//
 8//===----------------------------------------------------------------------===//
 9#ifndef _LIBCPP___EXPECTED_UNEXPECT_H
10#define _LIBCPP___EXPECTED_UNEXPECT_H
11
12#include <__config>
13
14#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15#  pragma GCC system_header
16#endif
17
18#if _LIBCPP_STD_VER >= 23
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22struct unexpect_t {
23  explicit unexpect_t() = default;
24};
25
26inline constexpr unexpect_t unexpect{};
27
28_LIBCPP_END_NAMESPACE_STD
29
30#endif // _LIBCPP_STD_VER >= 23
31
32#endif // _LIBCPP___EXPECTED_UNEXPECT_H