libcxx/include/__cxx03/__expected/unexpect.h

   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 <__cxx03/__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