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___SYSTEM_ERROR_ERROR_CATEGORY_H
11 #define _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H
12 
13 #include <__compare/ordering.h>
14 #include <__config>
15 #include <string>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 class _LIBCPP_EXPORTED_FROM_ABI error_condition;
24 class _LIBCPP_EXPORTED_FROM_ABI error_code;
25 
26 class _LIBCPP_HIDDEN __do_message;
27 
28 class _LIBCPP_EXPORTED_FROM_ABI error_category {
29 public:
30   virtual ~error_category() _NOEXCEPT;
31 
32 #if defined(_LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS)
33   error_category() noexcept;
34 #else
35   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 error_category() _NOEXCEPT = default;
36 #endif
37   error_category(const error_category&)            = delete;
38   error_category& operator=(const error_category&) = delete;
39 
40   virtual const char* name() const _NOEXCEPT = 0;
41   virtual error_condition default_error_condition(int __ev) const _NOEXCEPT;
42   virtual bool equivalent(int __code, const error_condition& __condition) const _NOEXCEPT;
43   virtual bool equivalent(const error_code& __code, int __condition) const _NOEXCEPT;
44   virtual string message(int __ev) const = 0;
45 
46   _LIBCPP_HIDE_FROM_ABI bool operator==(const error_category& __rhs) const _NOEXCEPT { return this == &__rhs; }
47 
48 #if _LIBCPP_STD_VER >= 20
49 
50   _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const error_category& __rhs) const noexcept {
51     return compare_three_way()(this, std::addressof(__rhs));
52   }
53 
54 #else // _LIBCPP_STD_VER >= 20
55 
56   _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_category& __rhs) const _NOEXCEPT { return !(*this == __rhs); }
57 
58   _LIBCPP_HIDE_FROM_ABI bool operator<(const error_category& __rhs) const _NOEXCEPT { return this < &__rhs; }
59 
60 #endif // _LIBCPP_STD_VER >= 20
61 
62   friend class _LIBCPP_HIDDEN __do_message;
63 };
64 
65 class _LIBCPP_HIDDEN __do_message : public error_category {
66 public:
67   string message(int __ev) const override;
68 };
69 
70 _LIBCPP_EXPORTED_FROM_ABI const error_category& generic_category() _NOEXCEPT;
71 _LIBCPP_EXPORTED_FROM_ABI const error_category& system_category() _NOEXCEPT;
72 
73 _LIBCPP_END_NAMESPACE_STD
74 
75 #endif // _LIBCPP___SYSTEM_ERROR_ERROR_CATEGORY_H
76