enum class
<system_error>
std::errcGeneric error conditions
Thisenum class type defines the error conditions of the generic category.
The value of each label is the same as the value defined for the equivalent errno value.
errc label errno equivalent*address_family_not_supported EAFNOSUPPORT address_in_use EADDRINUSE address_not_available EADDRNOTAVAIL already_connected EISCONN argument_list_too_long E2BIG argument_out_of_domain EDOM bad_address EFAULT bad_file_descriptor EBADF bad_message EBADMSG broken_pipe EPIPE connection_aborted ECONNABORTED connection_already_in_progress EALREADY connection_refused ECONNREFUSED connection_reset ECONNRESET cross_device_link EXDEV destination_address_required EDESTADDRREQ device_or_resource_busy EBUSY directory_not_empty ENOTEMPTY executable_format_error ENOEXEC file_exists EEXIST file_too_large EFBIG filename_too_long ENAMETOOLONG function_not_supported ENOSYS host_unreachable EHOSTUNREACH identifier_removed EIDRM illegal_byte_sequence EILSEQ inappropriate_io_control_operation ENOTTY interrupted EINTR invalid_argument EINVAL invalid_seek ESPIPE io_error EIO is_a_directory EISDIR message_size EMSGSIZE network_down ENETDOWN network_reset ENETRESET network_unreachable ENETUNREACH no_buffer_space ENOBUFS no_child_process ECHILD no_link ENOLINK no_lock_available ENOLOCK no_message ENOMSG no_message_available ENODATA no_protocol_option ENOPROTOOPT no_space_on_device ENOSPC no_stream_resources ENOSR no_such_device ENODEV no_such_device_or_address ENXIO no_such_file_or_directory ENOENT no_such_process ESRCH not_a_directory ENOTDIR not_a_socket ENOTSOCK not_a_stream ENOSTR not_connected ENOTCONN not_enough_memory ENOMEM not_supported ENOTSUP operation_canceled ECANCELED operation_in_progress EINPROGRESS operation_not_permitted EPERM operation_not_supported EOPNOTSUPP operation_would_block EWOULDBLOCK owner_dead EOWNERDEAD permission_denied EACCES protocol_error EPROTO protocol_not_supported EPROTONOSUPPORT read_only_file_system EROFS resource_deadlock_would_occur EDEADLK resource_unavailable_try_again EAGAIN result_out_of_range ERANGE state_not_recoverable ENOTRECOVERABLE stream_timeout ETIME text_file_busy ETXTBSY timed_out ETIMEDOUT too_many_files_open EMFILE too_many_files_open_in_system ENFILE too_many_links EMLINK too_many_symbolic_link_levels ELOOP value_too_large EOVERFLOW wrong_protocol_type EPROTOTYPE * These are macro constants defined in header <cerrno>.
Notice that errc is defined as an enum class while the possible values of errno are macro definitions.
is_error_condition_enum is specialized for this type so its value is true.
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// errc example
#include <iostream> // std::cout
#include <system_error> // std::error_condition, std::errc, std::generic_category
#include <cerrno> // EEXIST
int main()
{
// two ways of creating the same error_condition:
std::error_condition foo (std::errc::file_exists);
std::error_condition bar (EEXIST, std::generic_category() );
if (foo == bar) std::cout << foo.message();
return 0;
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