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92f5a8d4 | 1 | /* Traits for Outcome |
f67539c2 | 2 | (C) 2018-2020 Niall Douglas <http://www.nedproductions.biz/> (6 commits) |
92f5a8d4 TL |
3 | File Created: March 2018 |
4 | ||
5 | ||
6 | Boost Software License - Version 1.0 - August 17th, 2003 | |
7 | ||
8 | Permission is hereby granted, free of charge, to any person or organization | |
9 | obtaining a copy of the software and accompanying documentation covered by | |
10 | this license (the "Software") to use, reproduce, display, distribute, | |
11 | execute, and transmit the Software, and to prepare derivative works of the | |
12 | Software, and to permit third-parties to whom the Software is furnished to | |
13 | do so, all subject to the following: | |
14 | ||
15 | The copyright notices in the Software and this entire statement, including | |
16 | the above license grant, this restriction and the following disclaimer, | |
17 | must be included in all copies of the Software, in whole or in part, and | |
18 | all derivative works of the Software, unless such copies or derivative | |
19 | works are solely in the form of machine-executable object code generated by | |
20 | a source language processor. | |
21 | ||
22 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
23 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
24 | FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT | |
25 | SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE | |
26 | FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, | |
27 | ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
28 | DEALINGS IN THE SOFTWARE. | |
29 | */ | |
30 | ||
31 | #ifndef BOOST_OUTCOME_TRAIT_STD_ERROR_CODE_HPP | |
32 | #define BOOST_OUTCOME_TRAIT_STD_ERROR_CODE_HPP | |
33 | ||
34 | #include "../config.hpp" | |
35 | ||
36 | #include <system_error> | |
37 | ||
38 | BOOST_OUTCOME_V2_NAMESPACE_BEGIN | |
39 | ||
40 | namespace detail | |
41 | { | |
42 | // Customise _set_error_is_errno | |
43 | template <class State> constexpr inline void _set_error_is_errno(State &state, const std::error_code &error) | |
44 | { | |
45 | if(error.category() == std::generic_category() | |
46 | #ifndef _WIN32 | |
47 | || error.category() == std::system_category() | |
48 | #endif | |
49 | ) | |
50 | { | |
f67539c2 | 51 | state._status.set_have_error_is_errno(true); |
92f5a8d4 TL |
52 | } |
53 | } | |
54 | template <class State> constexpr inline void _set_error_is_errno(State &state, const std::error_condition &error) | |
55 | { | |
56 | if(error.category() == std::generic_category() | |
57 | #ifndef _WIN32 | |
58 | || error.category() == std::system_category() | |
59 | #endif | |
60 | ) | |
61 | { | |
f67539c2 | 62 | state._status.set_have_error_is_errno(true); |
92f5a8d4 TL |
63 | } |
64 | } | |
f67539c2 TL |
65 | template <class State> constexpr inline void _set_error_is_errno(State &state, const std::errc & /*unused*/) { |
66 | state._status.set_have_error_is_errno(true); | |
67 | } | |
92f5a8d4 TL |
68 | |
69 | } // namespace detail | |
70 | ||
71 | namespace policy | |
72 | { | |
73 | namespace detail | |
74 | { | |
75 | /* Pass through `make_error_code` function for `std::error_code`. | |
76 | */ | |
77 | inline std::error_code make_error_code(std::error_code v) { return v; } | |
78 | ||
79 | // Try ADL, if not use fall backs above | |
80 | template <class T> constexpr inline decltype(auto) error_code(T &&v) { return make_error_code(std::forward<T>(v)); } | |
81 | ||
82 | struct std_enum_overload_tag | |
83 | { | |
84 | }; | |
85 | } // namespace detail | |
86 | ||
87 | /*! AWAITING HUGO JSON CONVERSION TOOL | |
88 | SIGNATURE NOT RECOGNISED | |
89 | */ | |
90 | template <class T> constexpr inline decltype(auto) error_code(T &&v) { return detail::error_code(std::forward<T>(v)); } | |
91 | ||
92 | /*! AWAITING HUGO JSON CONVERSION TOOL | |
93 | SIGNATURE NOT RECOGNISED | |
94 | */ | |
95 | // inline void outcome_throw_as_system_error_with_payload(...) = delete; // To use the error_code_throw_as_system_error policy with a custom Error type, you must define a outcome_throw_as_system_error_with_payload() free function to say how to handle the payload | |
96 | inline void outcome_throw_as_system_error_with_payload(const std::error_code &error) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(error)); } // NOLINT | |
97 | BOOST_OUTCOME_TEMPLATE(class Error) | |
98 | BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(std::is_error_code_enum<std::decay_t<Error>>::value || std::is_error_condition_enum<std::decay_t<Error>>::value)) | |
99 | inline void outcome_throw_as_system_error_with_payload(Error &&error, detail::std_enum_overload_tag /*unused*/ = detail::std_enum_overload_tag()) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(make_error_code(error))); } // NOLINT | |
100 | } // namespace policy | |
101 | ||
102 | namespace trait | |
103 | { | |
104 | namespace detail | |
105 | { | |
106 | template <> struct _is_error_code_available<std::error_code> | |
107 | { | |
108 | // Shortcut this for lower build impact | |
109 | static constexpr bool value = true; | |
110 | using type = std::error_code; | |
111 | }; | |
112 | } // namespace detail | |
113 | ||
114 | // std::error_code is an error type | |
115 | template <> struct is_error_type<std::error_code> | |
116 | { | |
117 | static constexpr bool value = true; | |
118 | }; | |
119 | // For std::error_code, std::is_error_condition_enum<> is the trait we want. | |
120 | template <class Enum> struct is_error_type_enum<std::error_code, Enum> | |
121 | { | |
122 | static constexpr bool value = std::is_error_condition_enum<Enum>::value; | |
123 | }; | |
124 | ||
125 | } // namespace trait | |
126 | ||
127 | BOOST_OUTCOME_V2_NAMESPACE_END | |
128 | ||
129 | #endif |