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