From Jason Turner

[system_error.syn]

C++17 → C++20 6.8 KB 149 lines
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- ### Header `<system_error>` synopsis <a id="system_error.syn">[[system_error.syn]]</a>
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-
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- ``` cpp
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- namespace std {
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- class error_category;
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- const error_category& generic_category() noexcept;
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- const error_category& system_category() noexcept;
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-
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- class error_code;
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- class error_condition;
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- class system_error;
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-
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- template <class T>
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- struct is_error_code_enum : public false_type {};
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-
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- template <class T>
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- struct is_error_condition_enum : public false_type {};
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-
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- enum class errc {
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- address_family_not_supported, // EAFNOSUPPORT
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- address_in_use, // EADDRINUSE
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- address_not_available, // EADDRNOTAVAIL
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- already_connected, // EISCONN
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- argument_list_too_long, // E2BIG
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- argument_out_of_domain, // EDOM
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- bad_address, // EFAULT
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- bad_file_descriptor, // EBADF
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- bad_message, // EBADMSG
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- broken_pipe, // EPIPE
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- connection_aborted, // ECONNABORTED
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- connection_already_in_progress, // EALREADY
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- connection_refused, // ECONNREFUSED
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- connection_reset, // ECONNRESET
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- cross_device_link, // EXDEV
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- destination_address_required, // EDESTADDRREQ
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- device_or_resource_busy, // EBUSY
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- directory_not_empty, // ENOTEMPTY
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- executable_format_error, // ENOEXEC
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- file_exists, // EEXIST
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- file_too_large, // EFBIG
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- filename_too_long, // ENAMETOOLONG
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- function_not_supported, // ENOSYS
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- host_unreachable, // EHOSTUNREACH
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- identifier_removed, // EIDRM
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- illegal_byte_sequence, // EILSEQ
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- inappropriate_io_control_operation, // ENOTTY
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- interrupted, // EINTR
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- invalid_argument, // EINVAL
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- invalid_seek, // ESPIPE
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- io_error, // EIO
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- is_a_directory, // EISDIR
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- message_size, // EMSGSIZE
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- network_down, // ENETDOWN
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- network_reset, // ENETRESET
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- network_unreachable, // ENETUNREACH
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- no_buffer_space, // ENOBUFS
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- no_child_process, // ECHILD
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- no_link, // ENOLINK
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- no_lock_available, // ENOLCK
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- no_message_available, // ENODATA
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- no_message, // ENOMSG
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- no_protocol_option, // ENOPROTOOPT
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- no_space_on_device, // ENOSPC
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- no_stream_resources, // ENOSR
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- no_such_device_or_address, // ENXIO
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- no_such_device, // ENODEV
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- no_such_file_or_directory, // ENOENT
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- no_such_process, // ESRCH
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- not_a_directory, // ENOTDIR
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- not_a_socket, // ENOTSOCK
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- not_a_stream, // ENOSTR
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- not_connected, // ENOTCONN
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- not_enough_memory, // ENOMEM
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- not_supported, // ENOTSUP
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- operation_canceled, // ECANCELED
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- operation_in_progress, // EINPROGRESS
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- operation_not_permitted, // EPERM
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- operation_not_supported, // EOPNOTSUPP
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- operation_would_block, // EWOULDBLOCK
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- owner_dead, // EOWNERDEAD
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- permission_denied, // EACCES
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- protocol_error, // EPROTO
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- protocol_not_supported, // EPROTONOSUPPORT
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- read_only_file_system, // EROFS
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- resource_deadlock_would_occur, // EDEADLK
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- resource_unavailable_try_again, // EAGAIN
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- result_out_of_range, // ERANGE
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- state_not_recoverable, // ENOTRECOVERABLE
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- stream_timeout, // ETIME
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- text_file_busy, // ETXTBSY
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- timed_out, // ETIMEDOUT
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- too_many_files_open_in_system, // ENFILE
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- too_many_files_open, // EMFILE
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- too_many_links, // EMLINK
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- too_many_symbolic_link_levels, // ELOOP
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- value_too_large, // EOVERFLOW
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- wrong_protocol_type, // EPROTOTYPE
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- };
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-
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- template <> struct is_error_condition_enum<errc> : true_type {};
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-
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- // [syserr.errcode.nonmembers], non-member functions
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- error_code make_error_code(errc e) noexcept;
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-
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- template <class charT, class traits>
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- basic_ostream<charT, traits>&
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- operator<<(basic_ostream<charT, traits>& os, const error_code& ec);
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-
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- // [syserr.errcondition.nonmembers], non-member functions
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- error_condition make_error_condition(errc e) noexcept;
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-
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- // [syserr.compare], comparison functions
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- bool operator<(const error_code& lhs, const error_code& rhs) noexcept;
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- bool operator<(const error_condition& lhs, const error_condition& rhs) noexcept;
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- bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
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- bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
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- bool operator==(const error_condition& lhs, const error_code& rhs) noexcept;
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- bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
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- bool operator!=(const error_code& lhs, const error_code& rhs) noexcept;
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- bool operator!=(const error_code& lhs, const error_condition& rhs) noexcept;
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- bool operator!=(const error_condition& lhs, const error_code& rhs) noexcept;
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- bool operator!=(const error_condition& lhs, const error_condition& rhs) noexcept;
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-
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- // [syserr.hash], hash support
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- template <class T> struct hash;
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- template <> struct hash<error_code>;
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- template <> struct hash<error_condition>;
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-
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- // [syserr], system error support
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- template <class T> inline constexpr bool is_error_code_enum_v
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- = is_error_code_enum<T>::value;
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- template <class T> inline constexpr bool is_error_condition_enum_v
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- = is_error_condition_enum<T>::value;
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- }
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- ```
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-
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- The value of each `enum errc` constant shall be the same as the value of
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- the `<cerrno>` macro shown in the above synopsis. Whether or not the
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- `<system_error>` implementation exposes the `<cerrno>` macros is
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- unspecified.
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-
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- The `is_error_code_enum` and `is_error_condition_enum` may be
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- specialized for user-defined types to indicate that such types are
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- eligible for `class error_code` and `class error_condition` automatic
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- conversions, respectively.
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-