Trait ethcore_util::standard::StdError 1.0.0
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[src]
pub trait StdError: Debug + Display { fn description(&self) -> &str; fn cause(&self) -> Option<&Error> { ... } }
Base functionality for all errors in Rust.
Required Methods
fn description(&self) -> &str
A short description of the error.
The description should only be used for a simple message.
It should not contain newlines or sentence-ending punctuation,
to facilitate embedding in larger user-facing strings.
For showing formatted error messages with more information see
Display
.
Examples
use std::error::Error; match "xc".parse::<u32>() { Err(e) => { println!("Error: {}", e.description()); } _ => println!("No error"), }
Provided Methods
fn cause(&self) -> Option<&Error>
The lower-level cause of this error, if any.
Examples
use std::error::Error; use std::fmt; #[derive(Debug)] struct SuperError { side: SuperErrorSideKick, } impl fmt::Display for SuperError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "SuperError is here!") } } impl Error for SuperError { fn description(&self) -> &str { "I'm the superhero of errors!" } fn cause(&self) -> Option<&Error> { Some(&self.side) } } #[derive(Debug)] struct SuperErrorSideKick; impl fmt::Display for SuperErrorSideKick { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "SuperErrorSideKick is here!") } } impl Error for SuperErrorSideKick { fn description(&self) -> &str { "I'm SuperError side kick!" } } fn get_super_error() -> Result<(), SuperError> { Err(SuperError { side: SuperErrorSideKick }) } fn main() { match get_super_error() { Err(e) => { println!("Error: {}", e.description()); println!("Caused by: {}", e.cause().unwrap()); } _ => println!("No error"), } }
Methods
impl Error + 'static
fn is<T>(&self) -> bool where T: 'static + Error
1.3.0
Returns true if the boxed type is the same as T
fn downcast_ref<T>(&self) -> Option<&T> where T: 'static + Error
1.3.0
Returns some reference to the boxed value if it is of type T
, or
None
if it isn't.
fn downcast_mut<T>(&mut self) -> Option<&mut T> where T: 'static + Error
1.3.0
Returns some mutable reference to the boxed value if it is of type T
, or
None
if it isn't.
impl Error + 'static + Send
fn is<T>(&self) -> bool where T: 'static + Error
1.3.0
Forwards to the method defined on the type Any
.
fn downcast_ref<T>(&self) -> Option<&T> where T: 'static + Error
1.3.0
Forwards to the method defined on the type Any
.
fn downcast_mut<T>(&mut self) -> Option<&mut T> where T: 'static + Error
1.3.0
Forwards to the method defined on the type Any
.
impl Error + 'static + Send + Sync
fn is<T>(&self) -> bool where T: 'static + Error
1.3.0
Forwards to the method defined on the type Any
.
fn downcast_ref<T>(&self) -> Option<&T> where T: 'static + Error
1.3.0
Forwards to the method defined on the type Any
.
fn downcast_mut<T>(&mut self) -> Option<&mut T> where T: 'static + Error
1.3.0
Forwards to the method defined on the type Any
.
impl Error + 'static
fn downcast<T>(self: Box<Error + 'static>)
-> Result<Box<T>, Box<Error + 'static>> where T: 'static + Error
1.3.0
-> Result<Box<T>, Box<Error + 'static>> where T: 'static + Error
Attempt to downcast the box to a concrete type.
impl Error + 'static + Send
fn downcast<T>(self: Box<Error + 'static + Send>)
-> Result<Box<T>, Box<Error + 'static + Send>> where T: 'static + Error
1.3.0
-> Result<Box<T>, Box<Error + 'static + Send>> where T: 'static + Error
Attempt to downcast the box to a concrete type.
impl Error + 'static + Send + Sync
fn downcast<T>(self: Box<Error + 'static + Send + Sync>)
-> Result<Box<T>, Box<Error + 'static + Send + Sync>> where T: 'static + Error
1.3.0
-> Result<Box<T>, Box<Error + 'static + Send + Sync>> where T: 'static + Error
Attempt to downcast the box to a concrete type.
Implementors
impl Error for Error
impl Error for Error
impl Error for DecoderError
impl Error for OutOfRangeError
impl Error for ParseError
impl Error for VarError
impl Error for JoinPathsError
impl Error for ParseBoolError
impl Error for Utf8Error
impl Error for ParseIntError
impl Error for TryFromIntError
impl Error for ParseFloatError
impl Error for FromUtf8Error
impl Error for FromUtf16Error
impl Error for ParseError
impl Error for DecodeUtf16Error
impl<T> Error for Box<T> where T: Error
impl Error for Error
impl Error for BorrowError
impl Error for BorrowMutError
impl Error for CharTryFromError
impl Error for NulError
impl Error for IntoStringError
impl<W> Error for IntoInnerError<W> where W: Send + Debug
impl Error for Error
impl Error for CharsError
impl Error for AddrParseError
impl Error for StripPrefixError
impl<T> Error for SendError<T> where T: Send
impl<T> Error for TrySendError<T> where T: Send
impl Error for RecvError
impl Error for TryRecvError
impl Error for SystemTimeError
impl<T> Error for PoisonError<T>
impl<T> Error for TryLockError<T>
impl Error for Error
impl<T> Error for CapacityError<T> where T: Any
impl Error for FromBase64Error
impl Error for FromHexError
impl Error for DecoderError
impl Error for ParserError
impl Error for EncoderError
impl Error for SetLoggerError
impl Error for ShutdownLoggerError