std::errc

< cpp‎ | error

定义于头文件 `<system_error>`
enum class errc;		(C++11 起)

有作用域枚举 std::errc 定义对应 POSIX 错误码的可移植错误条件。

成员常量

常量	等价的 POSIX 错误
`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`	ENOLCK
`no_message_available`	ENODATA
`no_message`	ENOMSG
`no_protocol_option`	ENOPROTOOPT
`no_space_on_device`	ENOSPC
`no_stream_resources`	ENOSR
`no_such_device_or_address`	ENXIO
`no_such_device`	ENODEV
`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_in_system`	ENFILE
`too_many_files_open`	EMFILE
`too_many_links`	EMLINK
`too_many_symbolic_link_levels`	ELOOP
`value_too_large`	EOVERFLOW
`wrong_protocol_type`	EPROTOTYPE

非成员函数

make_error_code(std::errc) (C++11)	构造 std::errc 错误码 (函数)
make_error_condition(std::errc) (C++11)	构造 std::errc 错误条件 (函数)

帮助类

is_error_condition_enum<std::errc>

(C++11)

扩充 std::is_error_condition_enum 类型特性以鉴别 std::errc 值为 error_condition
(函数模板)

示例

#include <iostream>
#include <system_error>
#include <thread>
int main()
{
    try {
        std::thread().detach(); // 脱附一个非线程
    } catch (const std::system_error& e) {
        std::cout << "Caught a system_error\n";
        if(e.code() == std::errc::invalid_argument)
            std::cout << "The error condition is std::errc::invalid_argument\n";
        std::cout << "the error description is " << e.what() << '\n';
    }
}

输出：

Caught a system_error
The error condition is std::errc::invalid_argument
the error description is Invalid argument

参阅

error_code (C++11)	保有依赖于平台的错误码 (类)
error_condition (C++11)	保有可移植的错误码 (类)