BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
-namespace detail
+class _std_error_code_domain;
+//! A `status_code` representing exactly a `std::error_code`
+using std_error_code = status_code<_std_error_code_domain>;
+
+namespace mixins
{
- struct make_std_categories
+ template <class Base> struct mixin<Base, _std_error_code_domain> : public Base
{
- static const std::error_category &generic_category() { return std::generic_category(); }
- static const std::error_category &system_category() { return std::system_category(); }
+ using Base::Base;
+
+ //! Implicit constructor from a `std::error_code`
+ inline mixin(std::error_code ec);
+
+ //! Returns the error code category
+ inline const std::error_category &category() const noexcept;
};
-}
+} // namespace mixins
-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
+ */
+class _std_error_code_domain final : 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>;
+ using _error_code_type = std::error_code;
+ using _error_category_type = std::error_category;
+
+ std::string _name;
- static _base::string_ref _make_string_ref(error_code_type c) noexcept
+ static _base::string_ref _make_string_ref(_error_code_type c) noexcept
{
try
{
}
public:
- //! The value type of the `std::error_code` code, which is the `std::error_code`
- using value_type = error_code_type;
+ //! The value type of the `std::error_code` code, which stores the `int` from the `std::error_code`
+ using value_type = int;
using _base::string_ref;
+ //! Returns the error category singleton pointer this status code domain represents
+ const _error_category_type &error_category() const noexcept
+ {
+ auto ptr = 0x223a160d20de97b4 ^ this->id();
+ return *reinterpret_cast<const _error_category_type *>(ptr);
+ }
+
//! 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;
+ explicit _std_error_code_domain(const _error_category_type &category) noexcept
+ : _base(0x223a160d20de97b4 ^ reinterpret_cast<_base::unique_id_type>(&category))
+ , _name("std_error_code_domain(")
+ {
+ _name.append(category.name());
+ _name.push_back(')');
+ }
+ _std_error_code_domain(const _std_error_code_domain &) = default;
+ _std_error_code_domain(_std_error_code_domain &&) = default;
+ _std_error_code_domain &operator=(const _std_error_code_domain &) = default;
+ _std_error_code_domain &operator=(_std_error_code_domain &&) = default;
+ ~_std_error_code_domain() = default;
- //! Constexpr singleton getter. Returns constexpr error_code_domain variable.
- static inline constexpr const _error_code_domain &get();
+ static inline const _std_error_code_domain *get(_error_code_type ec);
- virtual string_ref name() const noexcept override { return string_ref("error_code compatibility domain"); } // NOLINT
+ virtual string_ref name() const noexcept override { return string_ref(_name.c_str(), _name.size()); } // 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
+ virtual bool _do_failure(const status_code<void> &code) const noexcept override;
+ virtual bool _do_equivalent(const status_code<void> &code1, const status_code<void> &code2) const noexcept override;
+ virtual generic_code _generic_code(const status_code<void> &code) const noexcept override;
+ virtual string_ref _do_message(const status_code<void> &code) const noexcept override;
+#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;
+#endif
+};
+
+namespace detail
+{
+ extern inline _std_error_code_domain *std_error_code_domain_from_category(const std::error_category &category)
{
- 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)
+ static constexpr size_t max_items = 64;
+ static struct storage_t
{
- 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)
+ std::atomic<unsigned> _lock;
+ union item_t {
+ int _init;
+ _std_error_code_domain domain;
+ constexpr item_t()
+ : _init(0)
+ {
+ }
+ ~item_t() {}
+ } items[max_items];
+ size_t count{0};
+
+ void lock()
{
- return c1.value().value() == c2.value().value();
+ while(_lock.exchange(1, std::memory_order_acquire) != 0)
+ ;
}
- // 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());
- return _c1 == code2;
-#elif !defined(BOOST_OUTCOME_SYSTEM_ERROR2_NOT_POSIX)
- posix_code _c1(c1.value().value());
- return _c1 == code2;
-#endif
- }
- return false;
+ void unlock() { _lock.store(0, std::memory_order_release); }
+
+ storage_t() {}
+ ~storage_t()
+ {
+ lock();
+ for(size_t n = 0; n < count; n++)
+ {
+ items[n].domain.~_std_error_code_domain();
+ }
+ unlock();
+ }
+ _std_error_code_domain *add(const std::error_category &category)
+ {
+ _std_error_code_domain *ret = nullptr;
+ lock();
+ for(size_t n = 0; n < count; n++)
+ {
+ if(items[n].domain.error_category() == category)
+ {
+ ret = &items[n].domain;
+ break;
+ }
+ }
+ if(ret == nullptr && count < max_items)
+ {
+ ret = new(&items[count++].domain) _std_error_code_domain(category);
+ }
+ unlock();
+ return ret;
+ }
+ } storage;
+ return storage.add(category);
}
- virtual generic_code _generic_code(const status_code<void> &code) const noexcept override final // NOLINT
+} // namespace detail
+
+namespace mixins
+{
+ template <class Base>
+ inline mixin<Base, _std_error_code_domain>::mixin(std::error_code ec)
+ : Base(typename Base::_value_type_constructor{}, _std_error_code_domain::get(ec), ec.value())
{
- 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
+
+ template <class Base> inline const std::error_category &mixin<Base, _std_error_code_domain>::category() const noexcept
+ {
+ const auto &domain = static_cast<const _std_error_code_domain &>(this->domain());
+ return domain.error_category();
+ };
+} // namespace mixins
+
+inline const _std_error_code_domain *_std_error_code_domain::get(std::error_code ec)
+{
+ auto *p = detail::std_error_code_domain_from_category(ec.category());
+ assert(p != nullptr);
+ if(p == nullptr)
{
- assert(code.domain() == *this);
- const auto &c = static_cast<const _status_code &>(code); // NOLINT
- return _make_string_ref(c.value());
+ abort();
}
-#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
+ return p;
+}
+
+
+inline bool _std_error_code_domain::_do_failure(const status_code<void> &code) const noexcept
+{
+ assert(code.domain() == *this);
+ return static_cast<const std_error_code &>(code).value() != 0; // NOLINT
+}
+
+inline bool _std_error_code_domain::_do_equivalent(const status_code<void> &code1, const status_code<void> &code2) const noexcept
+{
+ assert(code1.domain() == *this);
+ const auto &c1 = static_cast<const std_error_code &>(code1); // NOLINT
+ const auto &cat1 = c1.category();
+ // Are we comparing to another wrapped error_code?
+ if(code2.domain() == *this)
{
- assert(code.domain() == *this);
- const auto &c = static_cast<const _status_code &>(code); // NOLINT
- throw std::system_error(c.value());
+ const auto &c2 = static_cast<const std_error_code &>(code2); // NOLINT
+ const auto &cat2 = c2.category();
+ // If the error code categories are identical, do literal comparison
+ if(cat1 == cat2)
+ {
+ return c1.value() == c2.value();
+ }
+ // Otherwise fall back onto the _generic_code comparison, which uses default_error_condition()
+ return false;
+ }
+ // Am I an error code with generic category?
+ if(cat1 == std::generic_category())
+ {
+ // Convert to generic code, and compare that
+ generic_code _c1(static_cast<errc>(c1.value()));
+ return _c1 == code2;
}
+ // Am I an error code with system category?
+ if(cat1 == std::system_category())
+ {
+// Convert to POSIX or Win32 code, and compare that
+#ifdef _WIN32
+ win32_code _c1((win32::DWORD) c1.value());
+ return _c1 == code2;
+#elif !defined(BOOST_OUTCOME_SYSTEM_ERROR2_NOT_POSIX)
+ posix_code _c1(c1.value());
+ return _c1 == code2;
#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 false;
+}
+
+inline generic_code _std_error_code_domain::_generic_code(const status_code<void> &code) const noexcept
{
- return std_error_code_domain;
+ assert(code.domain() == *this);
+ const auto &c = static_cast<const std_error_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.category().default_error_condition(c.value()).value()));
}
-// Enable implicit construction of `std_error_code` from `std::error_code`.
-inline std_error_code make_status_code(std::error_code c) noexcept
+
+inline _std_error_code_domain::string_ref _std_error_code_domain::_do_message(const status_code<void> &code) const noexcept
{
- return std_error_code(in_place, c);
+ assert(code.domain() == *this);
+ const auto &c = static_cast<const std_error_code &>(code); // NOLINT
+ return _make_string_ref(_error_code_type(c.value(), c.category()));
}
+#if defined(_CPPUNWIND) || defined(__EXCEPTIONS) || defined(BOOST_OUTCOME_STANDARDESE_IS_IN_THE_HOUSE)
+BOOST_OUTCOME_SYSTEM_ERROR2_NORETURN inline void _std_error_code_domain::_do_throw_exception(const status_code<void> &code) const
+{
+ assert(code.domain() == *this);
+ const auto &c = static_cast<const std_error_code &>(code); // NOLINT
+ throw std::system_error(std::error_code(c.value(), c.category()));
+}
+#endif
+
+static_assert(sizeof(std_error_code) <= sizeof(void *) * 2, "std_error_code does not fit into a system_code!");
+
BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END
+// Enable implicit construction of `std_error_code` from `std::error_code`.
+namespace std
+{
+ inline BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::std_error_code make_status_code(error_code c) noexcept { return BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE::std_error_code(c); }
+} // namespace std
+
#endif
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