1/* Error observers for a very simple basic_result type
2(C) 2017-2024 Niall Douglas <http://www.nedproductions.biz/> (2 commits)
3File Created: Oct 2017
4
5
6Boost Software License - Version 1.0 - August 17th, 2003
7
8Permission is hereby granted, free of charge, to any person or organization
9obtaining a copy of the software and accompanying documentation covered by
10this license (the "Software") to use, reproduce, display, distribute,
11execute, and transmit the Software, and to prepare derivative works of the
12Software, and to permit third-parties to whom the Software is furnished to
13do so, all subject to the following:
14
15The copyright notices in the Software and this entire statement, including
16the above license grant, this restriction and the following disclaimer,
17must be included in all copies of the Software, in whole or in part, and
18all derivative works of the Software, unless such copies or derivative
19works are solely in the form of machine-executable object code generated by
20a source language processor.
21
22THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
25SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
26FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
27ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
28DEALINGS IN THE SOFTWARE.
29*/
30
31#ifndef BOOST_OUTCOME_BASIC_RESULT_ERROR_OBSERVERS_HPP
32#define BOOST_OUTCOME_BASIC_RESULT_ERROR_OBSERVERS_HPP
33
34#include "basic_result_storage.hpp"
35
36BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
37
38namespace detail
39{
40 template <class Base, class EC, class NoValuePolicy> class basic_result_error_observers : public Base
41 {
42 public:
43 using error_type = EC;
44 using Base::Base;
45
46 constexpr error_type &assume_error() & noexcept
47 {
48 NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &>(*this));
49 return this->_state._error;
50 }
51 constexpr const error_type &assume_error() const & noexcept
52 {
53 NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &>(*this));
54 return this->_state._error;
55 }
56 constexpr error_type &&assume_error() && noexcept
57 {
58 NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &&>(*this));
59 return static_cast<error_type &&>(this->_state._error);
60 }
61 constexpr const error_type &&assume_error() const && noexcept
62 {
63 NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &&>(*this));
64 return static_cast<const error_type &&>(this->_state._error);
65 }
66
67 constexpr error_type &error() &
68 {
69 NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &>(*this));
70 return this->_state._error;
71 }
72 constexpr const error_type &error() const &
73 {
74 NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &>(*this));
75 return this->_state._error;
76 }
77 constexpr error_type &&error() &&
78 {
79 NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &&>(*this));
80 return static_cast<error_type &&>(this->_state._error);
81 }
82 constexpr const error_type &&error() const &&
83 {
84 NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &&>(*this));
85 return static_cast<const error_type &&>(this->_state._error);
86 }
87 };
88 template <class Base, class NoValuePolicy> class basic_result_error_observers<Base, void, NoValuePolicy> : public Base
89 {
90 public:
91 using Base::Base;
92
93 constexpr void assume_error() & noexcept { NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &>(*this)); }
94 constexpr void assume_error() const & noexcept { NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &>(*this)); }
95 constexpr void assume_error() && noexcept { NoValuePolicy::narrow_error_check(static_cast<basic_result_error_observers &&>(*this)); }
96 constexpr void assume_error() const && noexcept { NoValuePolicy::narrow_error_check(static_cast<const basic_result_error_observers &&>(*this)); }
97
98 constexpr void error() & { NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &>(*this)); }
99 constexpr void error() const & { NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &>(*this)); }
100 constexpr void error() && { NoValuePolicy::wide_error_check(static_cast<basic_result_error_observers &&>(*this)); }
101 constexpr void error() const && { NoValuePolicy::wide_error_check(static_cast<const basic_result_error_observers &&>(*this)); }
102 };
103} // namespace detail
104BOOST_OUTCOME_V2_NAMESPACE_END
105
106#endif
107

source code of boost/libs/outcome/include/boost/outcome/detail/basic_result_error_observers.hpp