std::errc

 

C++

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符号索引

外部库

 

工具库

语言支持 类型支持（基本类型、 RTTI） 库功能特性测试宏 (C++20) 动态内存管理 程序工具 协程支持 (C++20) 变参数函数 is_constant_evaluated (C++20) is_within_lifetime (C++26) initializer_list (C++11) source_location (C++20) 三路比较 (C++20) three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20) is_eqis_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

通用工具 日期和时间 函数对象 格式化库 (C++20) bitset hash (C++11) 关系运算符 (C++20 中弃用) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= 整数比较函数 cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20) cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) swap 与类型运算 swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) 常用词汇类型 pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23) 初等字符串转换 to_chars (C++17) from_chars (C++17) chars_format (C++17) to_chars_result (C++17) from_chars_result (C++17)

 

诊断库

异常处理 exception uncaught_exceptionuncaught_exceptions (C++20 前)(C++17) exception_ptr (C++11) make_exception_ptr (C++11) current_exception (C++11) rethrow_exception (C++11) nested_exception (C++11) throw_with_nested (C++11) rethrow_if_nested (C++11) 异常处理失败 terminate terminate_handler get_terminate (C++11) set_terminate bad_exception unexpected (C++17 前) unexpected_handler (C++17 前) get_unexpected (C++11)(C++17 前) set_unexpected (C++17 前) 错误号 错误号 errno

异常类别 logic_error invalid_argument domain_error length_error out_of_range runtime_error range_error overflow_error underflow_error tx_exception (TM TS) 系统错误支持 error_category (C++11) generic_category (C++11) system_category (C++11) error_condition (C++11) errc (C++11) error_code (C++11) system_error (C++11) 断言 assert 栈踪 stacktrace_entry (C++23) basic_stacktrace (C++23)

 

std::errc

非成员函数

make_error_code

make_error_condition

帮助类

is_error_condition_enum

 

在标头 <system_error> 定义
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 (弃用)	ENODATA
no_message	ENOMSG
no_protocol_option	ENOPROTOOPT
no_space_on_device	ENOSPC
no_stream_resources (弃用)	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 (弃用)	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 (弃用)	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

运行此代码

#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 << "捕获了 system_error\n";
        if(e.code() == std::errc::invalid_argument)
            std::cout << "错误条件是 std::errc::invalid_argument\n";
        std::cout << "错误描述是 " << e.what() << '\n';
    }
}

输出：

"捕获了 system_error
错误条件是 std::errc::invalid_argument
错误描述是 Invalid argument

缺陷报告

下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。

缺陷报告	应用于	出版时的行为	正确行为
LWG 3869	C++11	成员常量 no_message_available、no_stream_resources、 not_a_stream 和 stream_timeout 涉及了废弃的 POSIX STREAMS API	弃用这些成员常量

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)