1.0.0[−][src]Trait geng::prelude::serde::de::StdError
Error
is a trait representing the basic expectations for error values,
i.e., values of type E
in Result<T, E>
. Errors must describe
themselves through the Display
and Debug
traits, and may provide
cause chain information:
Error::source()
is generally used when errors cross
"abstraction boundaries". If one module must report an error that is caused
by an error from a lower-level module, it can allow accessing that error
via Error::source()
. This makes it possible for the high-level
module to provide its own errors while also revealing some of the
implementation for debugging via source
chains.
Provided methods
fn source(&self) -> Option<&(dyn Error + 'static)>
1.30.0
The lower-level source 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 source(&self) -> Option<&(dyn Error + 'static)> { 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 get_super_error() -> Result<(), SuperError> { Err(SuperError { side: SuperErrorSideKick }) } fn main() { match get_super_error() { Err(e) => { println!("Error: {}", e); println!("Caused by: {}", e.source().unwrap()); } _ => println!("No error"), } }
fn backtrace(&self) -> Option<&Backtrace>
backtrace
)Returns a stack backtrace, if available, of where this error occurred.
This function allows inspecting the location, in code, of where an error
happened. The returned Backtrace
contains information about the stack
trace of the OS thread of execution of where the error originated from.
Note that not all errors contain a Backtrace
. Also note that a
Backtrace
may actually be empty. For more information consult the
Backtrace
type itself.
fn description(&self) -> &str
use the Display impl or to_string()
if let Err(e) = "xc".parse::<u32>() { // Print `e` itself, no need for description(). eprintln!("Error: {}", e); }
fn cause(&self) -> Option<&dyn Error>
replaced by Error::source, which can support downcasting
Implementations
impl dyn Error + 'static
[src]
pub fn is<T>(&self) -> bool where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Returns true
if the boxed type is the same as T
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Returns some reference to the boxed value if it is of type T
, or
None
if it isn't.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Returns some mutable reference to the boxed value if it is of type T
, or
None
if it isn't.
impl dyn Error + 'static + Send
[src]
pub fn is<T>(&self) -> bool where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
impl dyn Error + 'static + Sync + Send
[src]
pub fn is<T>(&self) -> bool where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
1.3.0[src]
T: 'static + Error,
Forwards to the method defined on the type dyn Error
.
impl dyn Error + 'static
[src]
pub fn downcast<T>(
self: Box<dyn Error + 'static>
) -> Result<Box<T>, Box<dyn Error + 'static>> where
T: 'static + Error,
1.3.0[src]
self: Box<dyn Error + 'static>
) -> Result<Box<T>, Box<dyn Error + 'static>> where
T: 'static + Error,
Attempts to downcast the box to a concrete type.
pub fn chain(&self) -> Chain<'_>
[src]
error_iter
)Returns an iterator starting with the current error and continuing with
recursively calling Error::source
.
If you want to omit the current error and only use its sources,
use skip(1)
.
Examples
#![feature(error_iter)] use std::error::Error; use std::fmt; #[derive(Debug)] struct A; #[derive(Debug)] struct B(Option<Box<dyn Error + 'static>>); impl fmt::Display for A { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "A") } } impl fmt::Display for B { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "B") } } impl Error for A {} impl Error for B { fn source(&self) -> Option<&(dyn Error + 'static)> { self.0.as_ref().map(|e| e.as_ref()) } } let b = B(Some(Box::new(A))); // let err : Box<Error> = b.into(); // or let err = &b as &(dyn Error); let mut iter = err.chain(); assert_eq!("B".to_string(), iter.next().unwrap().to_string()); assert_eq!("A".to_string(), iter.next().unwrap().to_string()); assert!(iter.next().is_none()); assert!(iter.next().is_none());
impl dyn Error + 'static + Send
[src]
pub fn downcast<T>(
self: Box<dyn Error + 'static + Send>
) -> Result<Box<T>, Box<dyn Error + 'static + Send>> where
T: 'static + Error,
1.3.0[src]
self: Box<dyn Error + 'static + Send>
) -> Result<Box<T>, Box<dyn Error + 'static + Send>> where
T: 'static + Error,
Attempts to downcast the box to a concrete type.
impl dyn Error + 'static + Sync + Send
[src]
pub fn downcast<T>(
self: Box<dyn Error + 'static + Sync + Send>
) -> Result<Box<T>, Box<dyn Error + 'static + Sync + Send>> where
T: 'static + Error,
1.3.0[src]
self: Box<dyn Error + 'static + Sync + Send>
) -> Result<Box<T>, Box<dyn Error + 'static + Sync + Send>> where
T: 'static + Error,
Attempts to downcast the box to a concrete type.
Trait Implementations
impl AsRef<dyn Error + 'static + Sync + Send> for Error
[src]
impl AsRef<dyn Error + 'static> for Error
[src]
Implementations on Foreign Types
impl Error for BorrowMutError
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pub fn description(&self) -> &str
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impl Error for ParseCharError
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pub fn description(&self) -> &str
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impl<T> Error for SendError<T> where
T: Send,
[src]
T: Send,
pub fn description(&self) -> &str
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impl<T> Error for Box<T> where
T: Error,
[src]
T: Error,
pub fn description(&self) -> &str
[src]
pub fn cause(&self) -> Option<&dyn Error>
[src]
pub fn source(&self) -> Option<&(dyn Error + 'static)>
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impl Error for TryFromSliceError
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pub fn description(&self) -> &str
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impl Error for FromBytesWithNulError
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pub fn description(&self) -> &str
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impl Error for JoinPathsError
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pub fn description(&self) -> &str
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impl Error for Utf8Error
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pub fn description(&self) -> &str
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impl Error for SystemTimeError
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pub fn description(&self) -> &str
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impl Error for StripPrefixError
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pub fn description(&self) -> &str
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impl Error for Error
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pub fn description(&self) -> &str
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impl<T> Error for TryLockError<T>
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impl Error for FromUtf8Error
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pub fn description(&self) -> &str
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impl Error for RecvError
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pub fn description(&self) -> &str
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impl Error for RecvTimeoutError
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pub fn description(&self) -> &str
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impl Error for TryReserveError
[src]
impl<W> Error for IntoInnerError<W> where
W: Send + Debug,
[src]
W: Send + Debug,
pub fn description(&self) -> &str
[src]
impl Error for TryFromIntError
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pub fn description(&self) -> &str
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impl<T> Error for TrySendError<T> where
T: Send,
[src]
T: Send,
pub fn description(&self) -> &str
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impl Error for FromVecWithNulError
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impl Error for AddrParseError
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pub fn description(&self) -> &str
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impl Error for TryRecvError
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pub fn description(&self) -> &str
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impl Error for ParseFloatError
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pub fn description(&self) -> &str
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impl Error for FromUtf16Error
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pub fn description(&self) -> &str
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impl Error for VarError
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pub fn description(&self) -> &str
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impl Error for DecodeUtf16Error
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pub fn description(&self) -> &str
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impl Error for ParseBoolError
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pub fn description(&self) -> &str
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impl Error for AllocError
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impl Error for !
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impl<T> Error for PoisonError<T>
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pub fn description(&self) -> &str
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impl Error for Infallible
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pub fn description(&self) -> &str
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impl Error for IntoStringError
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impl Error for AccessError
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impl Error for NulError
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pub fn description(&self) -> &str
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impl Error for CharTryFromError
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pub fn description(&self) -> &str
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impl Error for ParseIntError
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pub fn description(&self) -> &str
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impl Error for BorrowError
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pub fn description(&self) -> &str
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impl Error for LayoutErr
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impl Error for Error
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impl Error for ParseError
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pub fn description(&self) -> &str
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impl Error for RoundingError
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pub fn description(&self) -> &str
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impl Error for OutOfRangeError
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pub fn description(&self) -> &str
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impl Error for ParseError
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pub fn description(&self) -> &str
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impl Error for ParseColorError
pub fn description(&self) -> &str
impl Error for ProgramLinkError
[src]
impl Error for ShaderCompilationError
[src]
impl<Enum> Error for TryFromPrimitiveError<Enum> where
Enum: TryFromPrimitive,
Enum: TryFromPrimitive,
impl Error for ContextError
[src]
pub fn description(&self) -> &str
[src]
impl Error for CreationError
[src]
impl Error for OpenError
pub fn description(&self) -> &str
impl Error for XNotSupported
impl Error for BadIcon
impl Error for OsError
impl Error for XError
impl Error for NotSupportedError
impl<T> Error for EventLoopClosed<T> where
T: Debug,
T: Debug,
impl Error for ExternalError
impl Error for Error
impl<E> Error for InsertError<E>
impl Error for Errno
impl Error for Error
impl Error for ConnectError
impl Error for ProtocolError
pub fn description(&self) -> &str
impl Error for GlobalError
impl Error for MessageParseError
impl Error for MessageWriteError
impl<E> Error for Err<E> where
E: Debug,
E: Debug,
impl Error for CacheWriteErr
[src]
impl Error for CacheReadErr
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impl Error for Error
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
pub fn source(&self) -> Option<&(dyn Error + 'static)>
impl Error for BaseDirectoriesError
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for EmitterError
pub fn description(&self) -> &str
impl Error for Error
pub fn description(&self) -> &str
impl<T> Error for TrySendError<T> where
T: Any,
T: Any,
pub fn description(&self) -> &str
impl<T> Error for SendError<T> where
T: Any,
T: Any,
pub fn description(&self) -> &str
impl Error for EncodingError
[src]
impl Error for DecodingError
[src]
impl Error for LimitError
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impl Error for UnsupportedError
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impl Error for Error
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impl Error for ImageError
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impl Error for ParameterError
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impl Error for TiffError
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for Error
impl Error for ThreadPoolBuildError
[src]
impl Error for SelectTimeoutError
impl Error for RecvError
impl Error for RecvTimeoutError
impl Error for TrySelectError
impl<T> Error for SendError<T> where
T: Send,
T: Send,
impl Error for TryRecvError
impl<T> Error for SendTimeoutError<T> where
T: Send,
T: Send,
impl<T> Error for TrySendError<T> where
T: Send,
T: Send,
impl Error for LzwError
impl Error for EncodingError
impl Error for DecodingFormatError
impl Error for DecodingError
impl Error for DecodingError
impl Error for EncodingError
impl Error for Error
[src]
impl Error for Error
[src]
pub fn description(&self) -> &str
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impl Error for InvalidOutputSize
pub fn description(&self) -> &str
impl Error for ParseError
[src]
impl Error for DecoderError
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pub fn description(&self) -> &str
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impl Error for StreamError
[src]
impl Error for DefaultStreamConfigError
impl Error for HostUnavailable
impl Error for StreamError
impl Error for SupportedStreamConfigsError
impl Error for DeviceNameError
impl Error for PlayStreamError
impl Error for DevicesError
impl Error for BackendSpecificError
impl Error for BuildStreamError
impl Error for PauseStreamError
impl Error for Error
pub fn description(&self) -> &str
pub fn source(&self) -> Option<&(dyn Error + 'static)>
impl Error for Error
pub fn description(&self) -> &str
impl Error for Errno
pub fn description(&self) -> &str
impl Error for Void
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for Error
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for Error
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for VorbisError
impl Error for HeaderReadError
impl Error for AudioReadError
impl Error for OggReadError
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for Error
pub fn description(&self) -> &str
pub fn cause(&self) -> Option<&dyn Error>
impl Error for Error
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Loading content...Implementors
impl Error for ErrorKind
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impl Error for BernoulliError
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impl Error for WeightedError
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impl Error for geng::prelude::futures::channel::mpsc::SendError
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impl Error for geng::prelude::futures::channel::mpsc::TryRecvError
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impl Error for Canceled
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impl Error for EnterError
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impl Error for Aborted
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impl Error for geng::prelude::futures::io::Error
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pub fn description(&self) -> &str
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pub fn cause(&self) -> Option<&dyn Error>
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pub fn source(&self) -> Option<&(dyn Error + 'static)>
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impl Error for SpawnError
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impl Error for ParseLevelError
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impl Error for SetLoggerError
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impl Error for ReadError
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impl Error for geng::prelude::rand::Error
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impl Error for geng::prelude::serde::de::value::Error
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pub fn description(&self) -> &str
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impl Error for geng::prelude::serde_json::Error
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impl Error for geng::prelude::structopt::clap::Error
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pub fn description(&self) -> &str
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impl<T> Error for geng::prelude::futures::channel::mpsc::TrySendError<T> where
T: Any,
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T: Any,
impl<T> Error for geng::prelude::futures::io::ReuniteError<T> where
T: Any,
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T: Any,
impl<T, Item> Error for geng::prelude::futures::prelude::stream::ReuniteError<T, Item> where
T: Any,
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T: Any,