1/* Finaliser for a very simple result type
2(C) 2017-2024 Niall Douglas <http://www.nedproductions.biz/> (5 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_FINAL_HPP
32#define BOOST_OUTCOME_BASIC_RESULT_FINAL_HPP
33
34#include "basic_result_error_observers.hpp"
35#include "basic_result_value_observers.hpp"
36
37BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
38
39namespace detail
40{
41 template <class R, class EC, class NoValuePolicy> using select_basic_result_impl = basic_result_error_observers<basic_result_value_observers<basic_result_storage<R, EC, NoValuePolicy>, R, NoValuePolicy>, EC, NoValuePolicy>;
42
43 template <class R, class S, class NoValuePolicy>
44 class basic_result_final
45#if defined(BOOST_OUTCOME_DOXYGEN_IS_IN_THE_HOUSE)
46 : public basic_result_error_observers<basic_result_value_observers<basic_result_storage<R, S, NoValuePolicy>, R, NoValuePolicy>, S, NoValuePolicy>
47#else
48 : public select_basic_result_impl<R, S, NoValuePolicy>
49#endif
50 {
51 using base = select_basic_result_impl<R, S, NoValuePolicy>;
52
53 public:
54 using base::base;
55
56 constexpr explicit operator bool() const noexcept { return this->_state._status.have_value(); }
57 constexpr bool has_value() const noexcept { return this->_state._status.have_value(); }
58 constexpr bool has_error() const noexcept { return this->_state._status.have_error(); }
59 constexpr bool has_exception() const noexcept { return this->_state._status.have_exception(); }
60 constexpr bool has_lost_consistency() const noexcept { return this->_state._status.have_lost_consistency(); }
61 constexpr bool has_failure() const noexcept { return this->_state._status.have_error() || this->_state._status.have_exception(); }
62
63 BOOST_OUTCOME_TEMPLATE(class T, class U, class V)
64 BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<R>>() == std::declval<detail::devoid<T>>()), //
65 BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<S>>() == std::declval<detail::devoid<U>>()))
66 constexpr bool operator==(const basic_result_final<T, U, V> &o) const noexcept( //
67 noexcept(std::declval<detail::devoid<R>>() == std::declval<detail::devoid<T>>()) && noexcept(std::declval<detail::devoid<S>>() == std::declval<detail::devoid<U>>()))
68 {
69 if(this->_state._status.have_value() && o._state._status.have_value())
70 {
71 return this->_state._value == o._state._value; // NOLINT
72 }
73 if(this->_state._status.have_error() && o._state._status.have_error())
74 {
75 return this->_state._error == o._state._error;
76 }
77 return false;
78 }
79 BOOST_OUTCOME_TEMPLATE(class T)
80 BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<R>() == std::declval<T>()))
81 constexpr bool operator==(const success_type<T> &o) const noexcept( //
82 noexcept(std::declval<R>() == std::declval<T>()))
83 {
84 if(this->_state._status.have_value())
85 {
86 return this->_state._value == o.value();
87 }
88 return false;
89 }
90 constexpr bool operator==(const success_type<void> &o) const noexcept
91 {
92 (void) o;
93 return this->_state._status.have_value();
94 }
95 BOOST_OUTCOME_TEMPLATE(class T)
96 BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<S>() == std::declval<T>()))
97 constexpr bool operator==(const failure_type<T, void> &o) const noexcept( //
98 noexcept(std::declval<S>() == std::declval<T>()))
99 {
100 if(this->_state._status.have_error())
101 {
102 return this->_state._error == o.error();
103 }
104 return false;
105 }
106 BOOST_OUTCOME_TEMPLATE(class T, class U, class V)
107 BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<R>>() != std::declval<detail::devoid<T>>()), //
108 BOOST_OUTCOME_TEXPR(std::declval<detail::devoid<S>>() != std::declval<detail::devoid<U>>()))
109 constexpr bool operator!=(const basic_result_final<T, U, V> &o) const noexcept( //
110 noexcept(std::declval<detail::devoid<R>>() != std::declval<detail::devoid<T>>()) && noexcept(std::declval<detail::devoid<S>>() != std::declval<detail::devoid<U>>()))
111 {
112 if(this->_state._status.have_value() && o._state._status.have_value())
113 {
114 return this->_state._value != o._state._value;
115 }
116 if(this->_state._status.have_error() && o._state._status.have_error())
117 {
118 return this->_state._error != o._state._error;
119 }
120 return true;
121 }
122 BOOST_OUTCOME_TEMPLATE(class T)
123 BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<R>() != std::declval<T>()))
124 constexpr bool operator!=(const success_type<T> &o) const noexcept( //
125 noexcept(std::declval<R>() != std::declval<T>()))
126 {
127 if(this->_state._status.have_value())
128 {
129 return this->_state._value != o.value();
130 }
131 return false;
132 }
133 constexpr bool operator!=(const success_type<void> &o) const noexcept
134 {
135 (void) o;
136 return !this->_state._status.have_value();
137 }
138 BOOST_OUTCOME_TEMPLATE(class T)
139 BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TEXPR(std::declval<S>() != std::declval<T>()))
140 constexpr bool operator!=(const failure_type<T, void> &o) const noexcept( //
141 noexcept(std::declval<S>() != std::declval<T>()))
142 {
143 if(this->_state._status.have_error())
144 {
145 return this->_state._error != o.error();
146 }
147 return true;
148 }
149 };
150 template <class T, class U, class V, class W> constexpr inline bool operator==(const success_type<W> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b == a; }
151 template <class T, class U, class V, class W> constexpr inline bool operator==(const failure_type<W, void> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b == a; }
152 template <class T, class U, class V, class W> constexpr inline bool operator!=(const success_type<W> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b != a; }
153 template <class T, class U, class V, class W> constexpr inline bool operator!=(const failure_type<W, void> &a, const basic_result_final<T, U, V> &b) noexcept(noexcept(b == a)) { return b != a; }
154} // namespace detail
155
156BOOST_OUTCOME_V2_NAMESPACE_END
157
158#endif
159

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