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 
22 struct unexpect_t {
23   explicit unexpect_t() = default;
24 };
25 
26 inline constexpr unexpect_t unexpect{};
27 
28 _LIBCPP_END_NAMESPACE_STD
29 
30 #endif // _LIBCPP_STD_VER >= 23
31 
32 #endif // _LIBCPP___EXPECTED_UNEXPECT_H
33