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- /* Proposed SG14 status_code
- (C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
- File Created: Aug 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_SYSTEM_ERROR2_STD_ERROR_CODE_HPP
- #define BOOST_OUTCOME_SYSTEM_ERROR2_STD_ERROR_CODE_HPP
- #include "posix_code.hpp"
- #if defined(_WIN32) || defined(BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE)
- #include "win32_code.hpp"
- #endif
- #include <system_error>
- BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
- namespace detail
- {
- struct make_std_categories
- {
- static const std::error_category &generic_category() { return std::generic_category(); }
- static const std::error_category &system_category() { return std::system_category(); }
- };
- }
- template <class error_code_type, class make_category_types> class _error_code_domain;
- //! A wrapper of `std::error_code`.
- using std_error_code = status_code<_error_code_domain<std::error_code, detail::make_std_categories>>;
- /*! The implementation of the domain for `std::error_code` error codes.
- */
- template <class error_code_type, class make_categories_type> class _error_code_domain : public status_code_domain
- {
- template <class DomainType> friend class status_code;
- template <class StatusCode> friend class detail::indirecting_domain;
- using _base = status_code_domain;
- using _status_code = status_code<_error_code_domain>;
- static _base::string_ref _make_string_ref(error_code_type c) noexcept
- {
- try
- {
- std::string msg = c.message();
- auto *p = static_cast<char *>(malloc(msg.size() + 1)); // NOLINT
- if(p == nullptr)
- {
- return _base::string_ref("failed to allocate message");
- }
- memcpy(p, msg.c_str(), msg.size() + 1);
- return _base::atomic_refcounted_string_ref(p, msg.size());
- }
- catch(...)
- {
- return _base::string_ref("failed to allocate message");
- }
- }
- public:
- //! The value type of the `std::error_code` code, which is the `std::error_code`
- using value_type = error_code_type;
- using _base::string_ref;
- //! Default constructor
- constexpr explicit _error_code_domain(typename _base::unique_id_type id = 0x223a160d20de97b4) noexcept : _base(id) {}
- _error_code_domain(const _error_code_domain &) = default;
- _error_code_domain(_error_code_domain &&) = default;
- _error_code_domain &operator=(const _error_code_domain &) = default;
- _error_code_domain &operator=(_error_code_domain &&) = default;
- ~_error_code_domain() = default;
- //! Constexpr singleton getter. Returns constexpr error_code_domain variable.
- static inline constexpr const _error_code_domain &get();
- virtual string_ref name() const noexcept override { return string_ref("error_code compatibility domain"); } // NOLINT
- protected:
- virtual bool _do_failure(const status_code<void> &code) const noexcept override final // NOLINT
- {
- assert(code.domain() == *this);
- return static_cast<const _status_code &>(code).value().value() != 0; // NOLINT
- }
- virtual bool _do_equivalent(const status_code<void> &code1, const status_code<void> &code2) const noexcept override final // NOLINT
- {
- assert(code1.domain() == *this);
- const auto &c1 = static_cast<const _status_code &>(code1); // NOLINT
- const auto &cat1 = c1.value().category();
- // Are we comparing to another wrapped error_code?
- if(code2.domain() == *this)
- {
- const auto &c2 = static_cast<const _status_code &>(code2); // NOLINT
- const auto &cat2 = c2.value().category();
- // If the error code categories are identical, do literal comparison
- if(cat1 == cat2)
- {
- return c1.value().value() == c2.value().value();
- }
- // Otherwise fall back onto the _generic_code comparison, which uses default_error_condition()
- return false;
- }
- // Am I an error code with generic category?
- const auto &generic_category = make_categories_type::generic_category();
- if(cat1 == generic_category)
- {
- // Convert to generic code, and compare that
- generic_code _c1(static_cast<errc>(c1.value().value()));
- return _c1 == code2;
- }
- // Am I an error code with system category?
- const auto &system_category = make_categories_type::system_category();
- if(cat1 == system_category)
- {
- // Convert to POSIX or Win32 code, and compare that
- #ifdef _WIN32
- win32_code _c1((win32::DWORD) c1.value().value());
- #else
- posix_code _c1(c1.value().value());
- #endif
- return _c1 == code2;
- }
- return false;
- }
- virtual generic_code _generic_code(const status_code<void> &code) const noexcept override final // NOLINT
- {
- assert(code.domain() == *this);
- const auto &c = static_cast<const _status_code &>(code); // NOLINT
- // Ask my embedded error code for its mapping to std::errc, which is a subset of our generic_code errc.
- return generic_code(static_cast<errc>(c.value().default_error_condition().value()));
- }
- virtual string_ref _do_message(const status_code<void> &code) const noexcept override // NOLINT
- {
- assert(code.domain() == *this);
- const auto &c = static_cast<const _status_code &>(code); // NOLINT
- return _make_string_ref(c.value());
- }
- #if defined(_CPPUNWIND) || defined(__EXCEPTIONS) || defined(BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE)
- BOOST_OUTCOME_SYSTEM_ERROR2_NORETURN virtual void _do_throw_exception(const status_code<void> &code) const override // NOLINT
- {
- assert(code.domain() == *this);
- const auto &c = static_cast<const _status_code &>(code); // NOLINT
- throw std::system_error(c.value());
- }
- #endif
- };
- //! A constexpr source variable for the `std::error_code` code domain. Returned by `_error_code_domain<error_code_type, detail::make_std_categoriesy>::get()`.
- constexpr _error_code_domain<std::error_code, detail::make_std_categories> std_error_code_domain;
- template <class error_code_type, class make_categories_type> inline constexpr const _error_code_domain<error_code_type, make_categories_type> &_error_code_domain<error_code_type, make_categories_type>::get()
- {
- return std_error_code_domain;
- }
- // Enable implicit construction of `std_error_code` from `std::error_code`.
- inline std_error_code make_status_code(std::error_code c) noexcept
- {
- return std_error_code(in_place, c);
- }
- BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END
- #endif
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