libcxx/include/expected

   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
  10 #ifndef _LIBCPP_EXPECTED
  11 #define _LIBCPP_EXPECTED
  12
  13 /*
  14   Header <expected> synopsis
  15
  16 namespace std {
  17   // [expected.unexpected], class template unexpected
  18   template<class E> class unexpected;
  19
  20   // [expected.bad], class template bad_expected_access
  21   template<class E> class bad_expected_access;
  22
  23   // [expected.bad.void], specialization for void
  24   template<> class bad_expected_access<void>;
  25
  26   // in-place construction of unexpected values
  27   struct unexpect_t {
  28     explicit unexpect_t() = default;
  29   };
  30   inline constexpr unexpect_t unexpect{};
  31
  32   // [expected.expected], class template expected
  33   template<class T, class E> class expected;
  34
  35   // [expected.void], partial specialization of expected for void types
  36   template<class T, class E> requires is_void_v<T> class expected<T, E>;
  37 }
  38
  39 */
  40
  41 #if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
  42 #  include <__cxx03/expected>
  43 #else
  44 #  include <__config>
  45
  46 #  if _LIBCPP_STD_VER >= 23
  47 #    include <__expected/bad_expected_access.h>
  48 #    include <__expected/expected.h>
  49 #    include <__expected/unexpect.h>
  50 #    include <__expected/unexpected.h>
  51 #  endif
  52
  53 #  include <version>
  54
  55 #  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  56 #    pragma GCC system_header
  57 #  endif
  58 #endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
  59
  60 #endif // _LIBCPP_EXPECTED