1/* Exception observers for outcome type
2(C) 2017-2024 Niall Douglas <http://www.nedproductions.biz/> (6 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_OUTCOME_EXCEPTION_OBSERVERS_IMPL_HPP
32#define BOOST_OUTCOME_BASIC_OUTCOME_EXCEPTION_OBSERVERS_IMPL_HPP
33
34#include "basic_outcome_exception_observers.hpp"
35
36#include "../policy/base.hpp"
37
38BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
39
40namespace policy
41{
42 template <class R, class S, class P, class NoValuePolicy, class Impl> inline constexpr auto &&base::_exception(Impl &&self) noexcept
43 {
44 // Impl will be some internal implementation class which has no knowledge of the _ptr stored
45 // beneath it. So statically cast, preserving rvalue and constness, to the derived class.
46 using Outcome = BOOST_OUTCOME_V2_NAMESPACE::detail::rebind_type<basic_outcome<R, S, P, NoValuePolicy>, decltype(self)>;
47#if defined(_MSC_VER) && _MSC_VER < 1920
48 // VS2017 tries a copy construction in the correct implementation despite that Outcome is always a rvalue or lvalue ref! :(
49 basic_outcome<R, S, P, NoValuePolicy> &_self = (basic_outcome<R, S, P, NoValuePolicy> &) (self); // NOLINT
50#else
51 Outcome _self = static_cast<Outcome>(self); // NOLINT
52#endif
53 return static_cast<Outcome>(_self)._ptr;
54 }
55} // namespace policy
56
57namespace detail
58{
59 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() & noexcept
60 {
61 NoValuePolicy::narrow_exception_check(*this);
62 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
63 }
64 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() const &noexcept
65 {
66 NoValuePolicy::narrow_exception_check(*this);
67 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
68 }
69 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() && noexcept
70 {
71 NoValuePolicy::narrow_exception_check(std::move(*this));
72 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
73 }
74 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::assume_exception() const &&noexcept
75 {
76 NoValuePolicy::narrow_exception_check(std::move(*this));
77 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
78 }
79
80 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() &
81 {
82 NoValuePolicy::wide_exception_check(*this);
83 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
84 }
85 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() const &
86 {
87 NoValuePolicy::wide_exception_check(*this);
88 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(*this);
89 }
90 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() &&
91 {
92 NoValuePolicy::wide_exception_check(std::move(*this));
93 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
94 }
95 template <class Base, class R, class S, class P, class NoValuePolicy> inline constexpr const typename basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception_type &&basic_outcome_exception_observers<Base, R, S, P, NoValuePolicy>::exception() const &&
96 {
97 NoValuePolicy::wide_exception_check(std::move(*this));
98 return NoValuePolicy::template _exception<R, S, P, NoValuePolicy>(std::move(*this));
99 }
100} // namespace detail
101
102BOOST_OUTCOME_V2_NAMESPACE_END
103
104#endif
105

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