std::errc

enum class errc;

通用错误条件

此enum class类型定义了错误条件的通用类别。

每个标签的值与等效的errno值定义的相同。

errc 标签	`errno` 等效*
`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`

* 这些是头文件<cerrno>中定义的宏常量。

请注意，errc 定义为enum class，而errno 的可能值是宏定义。

is_error_condition_enum 已针对此类型进行了特化，因此其value为true。

示例

// 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;
}

可能的输出

File exists

另见

error_condition: 错误条件 (类)

errno: 上一个错误号 (宏)

类

枚举类

函数

std::errc

示例

另见