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- /* Pointer to a SG14 status_code
- (C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
- File Created: Sep 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_STATUS_CODE_PTR_HPP
- #define BOOST_OUTCOME_SYSTEM_ERROR2_STATUS_CODE_PTR_HPP
- #include "status_code.hpp"
- BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
- namespace detail
- {
- template <class StatusCode> class indirecting_domain : public status_code_domain
- {
- template <class DomainType> friend class status_code;
- using _base = status_code_domain;
- public:
- using value_type = StatusCode *;
- using _base::string_ref;
- constexpr indirecting_domain() noexcept : _base(0xc44f7bdeb2cc50e9 ^ typename StatusCode::domain_type().id() /* unique-ish based on domain's unique id */) {}
- indirecting_domain(const indirecting_domain &) = default;
- indirecting_domain(indirecting_domain &&) = default; // NOLINT
- indirecting_domain &operator=(const indirecting_domain &) = default;
- indirecting_domain &operator=(indirecting_domain &&) = default; // NOLINT
- ~indirecting_domain() = default;
- #if __cplusplus < 201402L && !defined(_MSC_VER)
- static inline const indirecting_domain &get()
- {
- static indirecting_domain v;
- return v;
- }
- #else
- static inline constexpr const indirecting_domain &get();
- #endif
- virtual string_ref name() const noexcept override { return typename StatusCode::domain_type().name(); } // NOLINT
- protected:
- using _mycode = status_code<indirecting_domain>;
- virtual bool _do_failure(const status_code<void> &code) const noexcept override // NOLINT
- {
- assert(code.domain() == *this);
- const auto &c = static_cast<const _mycode &>(code); // NOLINT
- return typename StatusCode::domain_type()._do_failure(*c.value());
- }
- virtual bool _do_equivalent(const status_code<void> &code1, const status_code<void> &code2) const noexcept override // NOLINT
- {
- assert(code1.domain() == *this);
- const auto &c1 = static_cast<const _mycode &>(code1); // NOLINT
- return typename StatusCode::domain_type()._do_equivalent(*c1.value(), code2);
- }
- virtual generic_code _generic_code(const status_code<void> &code) const noexcept override // NOLINT
- {
- assert(code.domain() == *this);
- const auto &c = static_cast<const _mycode &>(code); // NOLINT
- return typename StatusCode::domain_type()._generic_code(*c.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 _mycode &>(code); // NOLINT
- return typename StatusCode::domain_type()._do_message(*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 _mycode &>(code); // NOLINT
- typename StatusCode::domain_type()._do_throw_exception(*c.value());
- }
- #endif
- virtual void _do_erased_copy(status_code<void> &dst, const status_code<void> &src, size_t /*unused*/) const override // NOLINT
- {
- assert(dst.domain() == *this);
- assert(src.domain() == *this);
- auto &d = static_cast<_mycode &>(dst); // NOLINT
- const auto &_s = static_cast<const _mycode &>(src); // NOLINT
- const StatusCode &s = *_s.value();
- new(&d) _mycode(in_place, new StatusCode(s));
- }
- virtual void _do_erased_destroy(status_code<void> &code, size_t /*unused*/) const noexcept override // NOLINT
- {
- assert(code.domain() == *this);
- auto &c = static_cast<_mycode &>(code); // NOLINT
- delete c.value(); // NOLINT
- }
- };
- #if __cplusplus >= 201402L || defined(_MSC_VER)
- template <class StatusCode> constexpr indirecting_domain<StatusCode> _indirecting_domain{};
- template <class StatusCode> inline constexpr const indirecting_domain<StatusCode> &indirecting_domain<StatusCode>::get() { return _indirecting_domain<StatusCode>; }
- #endif
- } // namespace detail
- /*! Make an erased status code which indirects to a dynamically allocated status code.
- This is useful for shoehorning a rich status code with large value type into a small
- erased status code like `system_code`, with which the status code generated by this
- function is compatible. Note that this function can throw due to `bad_alloc`.
- */
- template <class T, typename std::enable_if<is_status_code<T>::value, bool>::type = true> //
- inline status_code<erased<typename std::add_pointer<typename std::decay<T>::type>::type>> make_status_code_ptr(T &&v)
- {
- using status_code_type = typename std::decay<T>::type;
- return status_code<detail::indirecting_domain<status_code_type>>(in_place, new status_code_type(static_cast<T &&>(v)));
- }
- BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END
- #endif
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