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_BAD_EXPECTED_ACCESS_H
10#define _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H
11
12#include <__config>
13#include <__exception/exception.h>
14#include <__utility/move.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17#  pragma GCC system_header
18#endif
19
20_LIBCPP_PUSH_MACROS
21#include <__undef_macros>
22
23#if _LIBCPP_STD_VER >= 23
24
25_LIBCPP_BEGIN_NAMESPACE_STD
26
27template <class _Err>
28class bad_expected_access;
29
30_LIBCPP_DIAGNOSTIC_PUSH
31#  if !_LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION
32_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables")
33#  endif
34template <>
35class _LIBCPP_EXPORTED_FROM_ABI bad_expected_access<void> : public exception {
36protected:
37  _LIBCPP_HIDE_FROM_ABI bad_expected_access() noexcept                                      = default;
38  _LIBCPP_HIDE_FROM_ABI bad_expected_access(const bad_expected_access&) noexcept            = default;
39  _LIBCPP_HIDE_FROM_ABI bad_expected_access(bad_expected_access&&) noexcept                 = default;
40  _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(const bad_expected_access&) noexcept = default;
41  _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(bad_expected_access&&) noexcept      = default;
42  _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~bad_expected_access() override                             = default;
43
44public:
45#  if _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION
46  const char* what() const noexcept override;
47#  else
48  _LIBCPP_HIDE_FROM_ABI_VIRTUAL const char* what() const noexcept override { return "bad access to std::expected"; }
49#  endif
50};
51_LIBCPP_DIAGNOSTIC_POP
52
53template <class _Err>
54class bad_expected_access : public bad_expected_access<void> {
55public:
56  _LIBCPP_HIDE_FROM_ABI explicit bad_expected_access(_Err __e) : __unex_(std::move(__e)) {}
57
58  _LIBCPP_HIDE_FROM_ABI _Err& error() & noexcept { return __unex_; }
59  _LIBCPP_HIDE_FROM_ABI const _Err& error() const& noexcept { return __unex_; }
60  _LIBCPP_HIDE_FROM_ABI _Err&& error() && noexcept { return std::move(__unex_); }
61  _LIBCPP_HIDE_FROM_ABI const _Err&& error() const&& noexcept { return std::move(__unex_); }
62
63private:
64  _Err __unex_;
65};
66
67_LIBCPP_END_NAMESPACE_STD
68
69#endif // _LIBCPP_STD_VER >= 23
70
71_LIBCPP_POP_MACROS
72
73#endif // _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H