130 lines
4.7 KiB
C++
130 lines
4.7 KiB
C++
/* Traits for Outcome
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(C) 2018-2024 Niall Douglas <http://www.nedproductions.biz/> (6 commits)
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File Created: March 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_TRAIT_STD_ERROR_CODE_HPP
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#define BOOST_OUTCOME_TRAIT_STD_ERROR_CODE_HPP
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#include "../config.hpp"
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#include <system_error>
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BOOST_OUTCOME_V2_NAMESPACE_BEGIN
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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 std::error_code &error)
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{
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if(error.category() == std::generic_category()
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#ifndef _WIN32
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|| error.category() == std::system_category()
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#endif
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)
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{
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state._status.set_have_error_is_errno(true);
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}
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}
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template <class State> constexpr inline void _set_error_is_errno(State &state, const std::error_condition &error)
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{
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if(error.category() == std::generic_category()
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#ifndef _WIN32
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|| error.category() == std::system_category()
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#endif
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)
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{
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state._status.set_have_error_is_errno(true);
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}
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}
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template <class State> constexpr inline void _set_error_is_errno(State &state, const std::errc & /*unused*/) {
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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 policy
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{
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namespace detail
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{
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/* Pass through `make_error_code` function for `std::error_code`.
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*/
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inline std::error_code make_error_code(std::error_code v) { return v; }
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// Try ADL, if not use fall backs above
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template <class T> constexpr inline decltype(auto) error_code(T &&v) { return make_error_code(std::forward<T>(v)); }
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struct std_enum_overload_tag
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{
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};
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} // namespace detail
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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 T> constexpr inline decltype(auto) error_code(T &&v) { return detail::error_code(std::forward<T>(v)); }
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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// inline void outcome_throw_as_system_error_with_payload(...) = delete; // To use the error_code_throw_as_system_error policy with a custom Error type, you must define a outcome_throw_as_system_error_with_payload() free function to say how to handle the payload
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inline void outcome_throw_as_system_error_with_payload(const std::error_code &error) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(error)); } // NOLINT
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BOOST_OUTCOME_TEMPLATE(class Error)
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BOOST_OUTCOME_TREQUIRES(BOOST_OUTCOME_TPRED(std::is_error_code_enum<std::decay_t<Error>>::value || std::is_error_condition_enum<std::decay_t<Error>>::value))
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inline void outcome_throw_as_system_error_with_payload(Error &&error, detail::std_enum_overload_tag /*unused*/ = detail::std_enum_overload_tag()) { BOOST_OUTCOME_THROW_EXCEPTION(std::system_error(make_error_code(error))); } // NOLINT
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} // namespace policy
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namespace trait
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{
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namespace detail
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{
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template <> struct _is_error_code_available<std::error_code>
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{
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// Shortcut this for lower build impact
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static constexpr bool value = true;
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using type = std::error_code;
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};
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} // namespace detail
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// std::error_code is an error type
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template <> struct is_error_type<std::error_code>
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{
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static constexpr bool value = true;
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};
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// For std::error_code, std::is_error_condition_enum<> is the trait we want.
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template <class Enum> struct is_error_type_enum<std::error_code, Enum>
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{
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static constexpr bool value = std::is_error_condition_enum<Enum>::value;
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};
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} // namespace trait
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BOOST_OUTCOME_V2_NAMESPACE_END
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#endif
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