197 lines
8.0 KiB
C++
197 lines
8.0 KiB
C++
/* A very simple result type
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(C) 2018-2022 Niall Douglas <http://www.nedproductions.biz/> (11 commits)
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File Created: Apr 2018
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef BOOST_OUTCOME_EXPERIMENTAL_STATUS_RESULT_HPP
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#define BOOST_OUTCOME_EXPERIMENTAL_STATUS_RESULT_HPP
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#include "../basic_result.hpp"
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#include "../policy/fail_to_compile_observers.hpp"
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#if !BOOST_OUTCOME_USE_SYSTEM_STATUS_CODE && __has_include("status-code/system_error2.hpp")
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#include "status-code/system_error2.hpp"
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#else
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#include <status-code/system_error2.hpp>
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#endif
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BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN
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namespace trait
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{
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namespace detail
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{
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// Shortcut this for lower build impact. Used to tell outcome's converting constructors
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// that they can do E => EC or E => EP as necessary.
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template <class DomainType> struct _is_error_code_available<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>>
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{
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static constexpr bool value = true;
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using type = BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>;
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};
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template <class DomainType> struct _is_error_code_available<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errored_status_code<DomainType>>
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{
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static constexpr bool value = true;
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using type = BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errored_status_code<DomainType>;
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};
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} // namespace detail
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#if 0 // Do NOT enable weakened implicit construction for these types
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template <class DomainType> struct is_error_type<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>>
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{
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static constexpr bool value = true;
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};
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template <> struct is_error_type<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errc>
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{
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static constexpr bool value = true;
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};
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template <class DomainType, class Enum> struct is_error_type_enum<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>, Enum>
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{
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static constexpr bool value = boost::system::is_error_condition_enum<Enum>::value;
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};
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#endif
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template <class DomainType> struct is_move_bitcopying<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>>
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{
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static constexpr bool value = BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::traits::is_move_bitcopying<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>>::value;
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};
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template <class DomainType> struct is_move_bitcopying<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errored_status_code<DomainType>>
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{
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static constexpr bool value = BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::traits::is_move_bitcopying<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errored_status_code<DomainType>>::value;
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};
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} // namespace trait
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namespace detail
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{
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// Customise _set_error_is_errno
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template <class State> constexpr inline void _set_error_is_errno(State &state, const BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::generic_code & /*unused*/)
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{
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state._status.set_have_error_is_errno(true);
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}
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#ifndef BOOST_OUTCOME_SYSTEM_ERROR2_NOT_POSIX
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template <class State> constexpr inline void _set_error_is_errno(State &state, const BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::posix_code & /*unused*/)
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{
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state._status.set_have_error_is_errno(true);
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}
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#endif
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template <class State> constexpr inline void _set_error_is_errno(State &state, const BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errc & /*unused*/)
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{
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state._status.set_have_error_is_errno(true);
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}
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} // namespace detail
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namespace experimental
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{
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using namespace BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE;
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using BOOST_OUTCOME_V2_NAMESPACE::failure;
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using BOOST_OUTCOME_V2_NAMESPACE::success;
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namespace policy
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{
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using namespace BOOST_OUTCOME_V2_NAMESPACE::policy;
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template <class T, class EC, class E> struct status_code_throw
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{
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static_assert(!std::is_same<T, T>::value,
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"policy::status_code_throw not specialised for these types, did you use status_result<T, status_code<DomainType>, E>?");
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};
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template <class T, class DomainType> struct status_code_throw<T, status_code<DomainType>, void> : base
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{
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using _base = base;
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template <class Impl> static constexpr void wide_value_check(Impl &&self)
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{
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if(!base::_has_value(static_cast<Impl &&>(self)))
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{
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if(base::_has_error(static_cast<Impl &&>(self)))
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{
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#ifndef BOOST_NO_EXCEPTIONS
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base::_error(static_cast<Impl &&>(self)).throw_exception();
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#else
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BOOST_OUTCOME_THROW_EXCEPTION("wide value check failed");
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#endif
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}
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}
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}
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template <class Impl> static constexpr void wide_error_check(Impl &&self) { _base::narrow_error_check(static_cast<Impl &&>(self)); }
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};
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template <class T, class DomainType>
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struct status_code_throw<T, errored_status_code<DomainType>, void> : status_code_throw<T, status_code<DomainType>, void>
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{
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status_code_throw() = default;
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using status_code_throw<T, status_code<DomainType>, void>::status_code_throw;
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};
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template <class T, class EC>
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using default_status_result_policy = std::conditional_t< //
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std::is_void<EC>::value, //
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BOOST_OUTCOME_V2_NAMESPACE::policy::terminate, //
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std::conditional_t<is_status_code<EC>::value || is_errored_status_code<EC>::value, //
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status_code_throw<T, EC, void>, //
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BOOST_OUTCOME_V2_NAMESPACE::policy::fail_to_compile_observers //
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>>;
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} // namespace policy
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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template <class R, class S = errored_status_code<erased<typename system_code::value_type>>,
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class NoValuePolicy = policy::default_status_result_policy<R, S>> //
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using status_result = basic_result<R, S, NoValuePolicy>;
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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BOOST_OUTCOME_TEMPLATE(class R, class S, class NoValuePolicy)
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BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(std::is_copy_constructible<R>::value && (is_status_code<S>::value || is_errored_status_code<S>::value)))
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inline basic_result<R, S, NoValuePolicy> clone(const basic_result<R, S, NoValuePolicy> &v)
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{
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if(v)
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{
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return success_type<R>(v.assume_value());
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}
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return failure_type<S>(v.assume_error().clone(), hooks::spare_storage(&v));
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}
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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BOOST_OUTCOME_TEMPLATE(class S, class NoValuePolicy)
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BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(is_status_code<S>::value || is_errored_status_code<S>::value))
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inline basic_result<void, S, NoValuePolicy> clone(const basic_result<void, S, NoValuePolicy> &v)
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{
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if(v)
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{
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return success_type<void>();
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}
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return failure_type<S>(v.assume_error().clone(), hooks::spare_storage(&v));
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}
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} // namespace experimental
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BOOST_OUTCOME_V2_NAMESPACE_END
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#endif
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