Struct SysError 

pub struct SysError(/* private fields */);

定义系统错误。

Implementations

impl SysError

pub fn last() -> Self

从系统当前 errno 创建一个 SysError 对象。

pub fn is_err(self) -> bool

检测是否为出错状态。

pub fn is_ok(self) -> bool

检测是否为无错状态。

pub fn map_or<T>(self, other: T) -> Result<T, SysError>

当无错时将返回值映射为其他值。

pub fn to_str(&self) -> Cow<'_, str>

返回文本描述。

Trait Implementations

impl Clone for SysError

fn clone(&self) -> SysError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SysError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SysError

fn default() -> SysError

Returns the “default value” for a type.

impl Display for SysError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for SysError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<i32> for SysError

fn from(val: i32) -> Self

Converts to this type from the input type.

impl Into<i32> for SysError

fn into(self) -> i32

Converts this type into the (usually inferred) input type.

impl PartialEq for SysError

fn eq(&self, other: &SysError) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SysError

impl Eq for SysError

impl StructuralPartialEq for SysError