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Diffstat (limited to 'boost/outcome/experimental/status_outcome.hpp')
| -rw-r--r-- | boost/outcome/experimental/status_outcome.hpp | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/boost/outcome/experimental/status_outcome.hpp b/boost/outcome/experimental/status_outcome.hpp new file mode 100644 index 0000000000..8609c790b5 --- /dev/null +++ b/boost/outcome/experimental/status_outcome.hpp @@ -0,0 +1,149 @@ +/* A less simple result type +(C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (59 commits) +File Created: Apr 2018 + + +Boost Software License - Version 1.0 - August 17th, 2003 + +Permission is hereby granted, free of charge, to any person or organization +obtaining a copy of the software and accompanying documentation covered by +this license (the "Software") to use, reproduce, display, distribute, +execute, and transmit the Software, and to prepare derivative works of the +Software, and to permit third-parties to whom the Software is furnished to +do so, all subject to the following: + +The copyright notices in the Software and this entire statement, including +the above license grant, this restriction and the following disclaimer, +must be included in all copies of the Software, in whole or in part, and +all derivative works of the Software, unless such copies or derivative +works are solely in the form of machine-executable object code generated by +a source language processor. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT +SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE +FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. +*/ + +#ifndef BOOST_OUTCOME_EXPERIMENTAL_STATUS_OUTCOME_HPP +#define BOOST_OUTCOME_EXPERIMENTAL_STATUS_OUTCOME_HPP + +#include "../basic_outcome.hpp" + +#include "../detail/trait_std_exception.hpp" +#include "status_result.hpp" + +#include "boost/exception_ptr.hpp" + +BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN +template <class DomainType> inline std::exception_ptr basic_outcome_failure_exception_from_error(const status_code<DomainType> &sc) +{ + (void) sc; +#ifndef BOOST_NO_EXCEPTIONS + try + { + sc.throw_exception(); + } + catch(...) + { + return std::current_exception(); + } +#endif + return {}; +} +BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END + +BOOST_OUTCOME_V2_NAMESPACE_EXPORT_BEGIN + +namespace trait +{ + namespace detail + { + // Shortcut this for lower build impact + template <class DomainType> struct _is_error_code_available<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>> + { + static constexpr bool value = true; + }; + template <class DomainType> struct _is_error_code_available<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errored_status_code<DomainType>> + { + static constexpr bool value = true; + }; + } // namespace detail +#if 0 + template <class DomainType> struct is_error_type<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>> + { + static constexpr bool value = true; + }; + template <> struct is_error_type<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::errc> + { + static constexpr bool value = true; + }; + template <class DomainType, class Enum> struct is_error_type_enum<BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::status_code<DomainType>, Enum> + { + static constexpr bool value = boost::system::is_error_condition_enum<Enum>::value; + }; +#endif +} // namespace trait + + +namespace experimental +{ + namespace policy + { + template <class T, class EC, class E> + using default_status_outcome_policy = std::conditional_t< // + std::is_void<EC>::value && std::is_void<E>::value, // + BOOST_OUTCOME_V2_NAMESPACE::policy::terminate, // + std::conditional_t<(is_status_code<EC>::value || is_errored_status_code<EC>::value) && (std::is_void<E>::value || BOOST_OUTCOME_V2_NAMESPACE::trait::is_exception_ptr_available<E>::value), // + status_code_throw<T, EC, E>, // + BOOST_OUTCOME_V2_NAMESPACE::policy::fail_to_compile_observers // + >>; + } // namespace policy + + /*! AWAITING HUGO JSON CONVERSION TOOL +SIGNATURE NOT RECOGNISED +*/ + template <class R, class S = system_code, class P = std::exception_ptr, class NoValuePolicy = policy::default_status_outcome_policy<R, S, P>> // + using status_outcome = basic_outcome<R, S, P, NoValuePolicy>; + + namespace policy + { + template <class T, class DomainType, class E> struct status_code_throw<T, status_code<DomainType>, E> : base + { + using _base = base; + template <class Impl> static constexpr void wide_value_check(Impl &&self) + { + if(!base::_has_value(static_cast<Impl &&>(self))) + { + if(base::_has_exception(static_cast<Impl &&>(self))) + { + BOOST_OUTCOME_V2_NAMESPACE::policy::detail::_rethrow_exception<trait::is_exception_ptr_available<E>::value>(base::_exception<T, status_code<DomainType>, E, status_code_throw>(static_cast<Impl &&>(self))); // NOLINT + } + if(base::_has_error(static_cast<Impl &&>(self))) + { +#ifndef BOOST_NO_EXCEPTIONS + base::_error(static_cast<Impl &&>(self)).throw_exception(); +#else + BOOST_OUTCOME_THROW_EXCEPTION("wide value check failed"); +#endif + } + } + } + template <class Impl> static constexpr void wide_error_check(Impl &&self) { _base::narrow_error_check(static_cast<Impl &&>(self)); } + template <class Impl> static constexpr void wide_exception_check(Impl &&self) { _base::narrow_exception_check(static_cast<Impl &&>(self)); } + }; + template <class T, class DomainType, class E> struct status_code_throw<T, errored_status_code<DomainType>, E> : status_code_throw<T, status_code<DomainType>, E> + { + status_code_throw() = default; + using status_code_throw<T, status_code<DomainType>, E>::status_code_throw; + }; + } // namespace policy + +} // namespace experimental + +BOOST_OUTCOME_V2_NAMESPACE_END + +#endif |