Trait twilio_async::Error 1.0.0[−][src]
pub trait Error: Debug + Display { fn description(&self) -> &str { ... } fn cause(&self) -> Option<&Error> { ... } }
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:
The cause
method is generally used when errors cross "abstraction
boundaries", i.e. when a one module must report an error that is "caused"
by an error from a lower-level module. This setup makes it possible for the
high-level module to provide its own errors that do not commit to any
particular implementation, but also reveal some of its implementation for
debugging via cause
chains.
Provided Methods
fn description(&self) -> &str
This method is soft-deprecated.
Although using it won’t cause compilation warning,
new code should use Display
instead
and new impl
s can omit it.
To obtain error description as a string, use to_string()
.
Examples
match "xc".parse::<u32>() { Err(e) => { // Print `e` itself, not `e.description()`. println!("Error: {}", e); } _ => println!("No error"), }
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
[src]
impl Error + 'static
pub fn is<T>(&self) -> bool where
T: 'static + Error,
1.3.0[src]
pub fn is<T>(&self) -> bool where
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]
pub fn downcast_ref<T>(&self) -> Option<&T> where
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]
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
Returns some mutable reference to the boxed value if it is of type T
, or
None
if it isn't.
impl Error + 'static + Send
[src]
impl Error + 'static + Send
pub fn is<T>(&self) -> bool where
T: 'static + Error,
1.3.0[src]
pub fn is<T>(&self) -> bool where
T: 'static + Error,
Forwards to the method defined on the type Any
.
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
1.3.0[src]
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
Forwards to the method defined on the type Any
.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
1.3.0[src]
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
Forwards to the method defined on the type Any
.
impl Error + 'static + Send + Sync
[src]
impl Error + 'static + Send + Sync
pub fn is<T>(&self) -> bool where
T: 'static + Error,
1.3.0[src]
pub fn is<T>(&self) -> bool where
T: 'static + Error,
Forwards to the method defined on the type Any
.
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
1.3.0[src]
pub fn downcast_ref<T>(&self) -> Option<&T> where
T: 'static + Error,
Forwards to the method defined on the type Any
.
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
1.3.0[src]
pub fn downcast_mut<T>(&mut self) -> Option<&mut T> where
T: 'static + Error,
Forwards to the method defined on the type Any
.
impl Error + 'static
[src]
impl Error + 'static
pub fn downcast<T>(
self: Box<Error + 'static>
) -> Result<Box<T>, Box<Error + 'static>> where
T: 'static + Error,
1.3.0[src]
pub fn downcast<T>(
self: Box<Error + 'static>
) -> Result<Box<T>, Box<Error + 'static>> where
T: 'static + Error,
Attempt to downcast the box to a concrete type.
impl Error + 'static + Send
[src]
impl Error + 'static + Send
pub fn downcast<T>(
self: Box<Error + 'static + Send>
) -> Result<Box<T>, Box<Error + 'static + Send>> where
T: 'static + Error,
1.3.0[src]
pub fn downcast<T>(
self: Box<Error + 'static + Send>
) -> 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
[src]
impl Error + 'static + Send + Sync
pub fn downcast<T>(
self: Box<Error + 'static + Send + Sync>
) -> Result<Box<T>, Box<Error + 'static + Send + Sync>> where
T: 'static + Error,
1.3.0[src]
pub fn downcast<T>(
self: Box<Error + 'static + Send + Sync>
) -> Result<Box<T>, Box<Error + 'static + Send + Sync>> where
T: 'static + Error,
Attempt to downcast the box to a concrete type.
Implementations on Foreign Types
impl Error for !
[src]
impl Error for !
impl<T> Error for SendError<T> where
T: Send,
[src]
impl<T> Error for SendError<T> where
T: Send,
impl Error for ParseBoolError
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impl Error for ParseBoolError
impl Error for VarError
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impl Error for VarError
impl Error for DecodeUtf16Error
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impl Error for DecodeUtf16Error
impl Error for RecvError
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impl Error for RecvError
impl Error for NulError
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impl Error for NulError
impl Error for ParseFloatError
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impl Error for ParseFloatError
impl Error for Utf8Error
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impl Error for Utf8Error
impl<T> Error for TrySendError<T> where
T: Send,
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impl<T> Error for TrySendError<T> where
T: Send,
impl Error for FromUtf16Error
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impl Error for FromUtf16Error
impl<T> Error for PoisonError<T>
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impl<T> Error for PoisonError<T>
impl Error for TryFromIntError
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impl Error for TryFromIntError
impl Error for IntoStringError
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impl Error for IntoStringError
impl<T> Error for TryLockError<T>
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impl<T> Error for TryLockError<T>
impl Error for FromUtf8Error
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impl Error for FromUtf8Error
impl Error for AddrParseError
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impl Error for AddrParseError
impl Error for TryFromSliceError
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impl Error for TryFromSliceError
impl Error for FromBytesWithNulError
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impl Error for FromBytesWithNulError
impl Error for StripPrefixError
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impl Error for StripPrefixError
impl Error for JoinPathsError
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impl Error for JoinPathsError
impl Error for RecvTimeoutError
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impl Error for RecvTimeoutError
impl Error for CannotReallocInPlace
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impl Error for CannotReallocInPlace
impl Error for ParseIntError
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impl Error for ParseIntError
impl Error for SystemTimeError
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impl Error for SystemTimeError
impl Error for ParseError
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impl Error for ParseError
impl Error for TryRecvError
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impl Error for TryRecvError
impl Error for CharTryFromError
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impl Error for CharTryFromError
impl Error for ParseCharError
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impl Error for ParseCharError
impl Error for LayoutErr
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impl Error for LayoutErr
impl<T> Error for Box<T> where
T: Error,
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impl<T> Error for Box<T> where
T: Error,
impl Error for AllocErr
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impl Error for AllocErr
impl<T, E> Error for SendError<T, E> where
E: Any,
T: Any,
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impl<T, E> Error for SendError<T, E> where
E: Any,
T: Any,
impl<T> Error for SendError<T> where
T: Any,
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impl<T> Error for SendError<T> where
T: Any,
impl<T> Error for TrySendError<T> where
T: Any,
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impl<T> Error for TrySendError<T> where
T: Any,
impl<T> Error for ReuniteError<T> where
T: Any,
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impl<T> Error for ReuniteError<T> where
T: Any,
impl Error for Canceled
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impl Error for Canceled
impl<T> Error for SendError<T> where
T: Any,
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impl<T> Error for SendError<T> where
T: Any,
impl Error for Error
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impl Error for Error
impl Error for UriError
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impl Error for UriError
impl Error for DecodeError
impl Error for DecodeError
fn description(&self) -> &str
fn description(&self) -> &str
fn cause(&self) -> Option<&Error>
fn cause(&self) -> Option<&Error>
impl Error for Error
[src]
impl Error for Error
impl Error for Error
impl Error for Error
impl Error for SetLoggerError
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impl Error for SetLoggerError
impl Error for ParseLevelError
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impl Error for ParseLevelError
impl Error for FromStrError
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impl Error for FromStrError
impl Error for OutOfRangeError
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impl Error for OutOfRangeError
impl Error for ParseError
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impl Error for ParseError
impl Error for BlockingError
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impl Error for BlockingError
impl Error for ParkError
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impl Error for ParkError
impl Error for TimerError
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impl Error for TimerError
impl<T> Error for DeadlineError<T> where
T: Error,
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impl<T> Error for DeadlineError<T> where
T: Error,
impl Error for Error
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impl Error for Error
impl Error for ShutdownLoggerError
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impl Error for ShutdownLoggerError
impl Error for SetLoggerError
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impl Error for SetLoggerError
impl Error for Error
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impl Error for Error
impl<S> Error for HandshakeError<S> where
S: Any + Debug,
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impl<S> Error for HandshakeError<S> where
S: Any + Debug,
impl<S> Error for HandshakeError<S> where
S: Any + Debug,
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impl<S> Error for HandshakeError<S> where
S: Any + Debug,
impl Error for RetryError
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impl Error for RetryError
impl Error for ErrorStack
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impl Error for ErrorStack
impl Error for Error
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impl Error for Error
impl Error for Error
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impl Error for Error
impl Error for X509VerifyError
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impl Error for X509VerifyError
impl Error for Error
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impl Error for Error
impl Error for Error
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impl Error for Error
impl Error for ParseError
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impl Error for ParseError
impl Error for Error
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impl Error for Error
impl Error for EmitterError
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impl Error for EmitterError
Implementors
impl Error for CharsError
impl<W> Error for IntoInnerError<W> where
W: Send + Debug,impl Error for BorrowError
impl Error for BorrowMutError
impl Error for twilio_async::io::Error
impl Error for twilio_async::fmt::Error
impl<E> Error for SharedError<E> where
E: Error,impl Error for TwilioErr