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_LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
27
28template <class _Err>
29class bad_expected_access;
30
31_LIBCPP_DIAGNOSTIC_PUSH
32# if !_LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION
33_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables")
34# endif
35template <>
36class _LIBCPP_EXPORTED_FROM_ABI bad_expected_access<void> : public exception {
37protected:
38 _LIBCPP_HIDE_FROM_ABI bad_expected_access() noexcept = default;
39 _LIBCPP_HIDE_FROM_ABI bad_expected_access(const bad_expected_access&) noexcept = default;
40 _LIBCPP_HIDE_FROM_ABI bad_expected_access(bad_expected_access&&) noexcept = default;
41 _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(const bad_expected_access&) noexcept = default;
42 _LIBCPP_HIDE_FROM_ABI bad_expected_access& operator=(bad_expected_access&&) noexcept = default;
43 _LIBCPP_HIDE_FROM_ABI_VIRTUAL ~bad_expected_access() override = default;
44
45public:
46# if _LIBCPP_AVAILABILITY_HAS_BAD_EXPECTED_ACCESS_KEY_FUNCTION
47 [[nodiscard]] const char* what() const noexcept override;
48# else
49 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI_VIRTUAL const char* what() const noexcept override {
50 return "bad access to std::expected";
51 }
52# endif
53};
54_LIBCPP_DIAGNOSTIC_POP
55
56template <class _Err>
57class bad_expected_access : public bad_expected_access<void> {
58public:
59 _LIBCPP_HIDE_FROM_ABI explicit bad_expected_access(_Err __e) : __unex_(std::move(__e)) {}
60
61 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI _Err& error() & noexcept { return __unex_; }
62 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const _Err& error() const& noexcept { return __unex_; }
63 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI _Err&& error() && noexcept { return std::move(__unex_); }
64 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI const _Err&& error() const&& noexcept { return std::move(__unex_); }
65
66private:
67 _Err __unex_;
68};
69
70_LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
71_LIBCPP_END_NAMESPACE_STD
72
73#endif // _LIBCPP_STD_VER >= 23
74
75_LIBCPP_POP_MACROS
76
77#endif // _LIBCPP___EXPECTED_BAD_EXPECTED_ACCESS_H
78