[−][src]Trait failure::ResultExt
Extension methods for Result
.
Required methods
fn compat(self) -> Result<T, Compat<E>>
Wraps the error in Compat
to make it compatible with older error
handling APIs that expect std::error::Error
.
Examples
use std::error::Error; struct CustomError; impl Error for CustomError { fn description(&self) -> &str { "My custom error message" } fn cause(&self) -> Option<&Error> { None } } let x = (|| -> Result<(), failure::Error> { Err(CustomError).compat()? })().with_context(|e| { format!("An error occured: {}", e) }).unwrap_err(); let x = format!("{}", x); assert_eq!(x, "An error occured: My custom error message");
fn context<D>(self, context: D) -> Result<T, Context<D>> where
D: Display + Send + Sync + 'static,
D: Display + Send + Sync + 'static,
Wraps the error type in a context type.
Examples
#[derive(Fail, Debug)] #[fail(display = "")] struct CustomError; let x = (|| -> Result<(), failure::Error> { Err(CustomError)? })().context(format!("An error occured")).unwrap_err(); let x = format!("{}", x); assert_eq!(x, "An error occured");
fn with_context<F, D>(self, f: F) -> Result<T, Context<D>> where
F: FnOnce(&E) -> D,
D: Display + Send + Sync + 'static,
F: FnOnce(&E) -> D,
D: Display + Send + Sync + 'static,
Wraps the error type in a context type generated by looking at the error value.
Examples
#[derive(Fail, Debug)] #[fail(display = "My custom error message")] struct CustomError; let x = (|| -> Result<(), failure::Error> { Err(CustomError)? })().with_context(|e| { format!("An error occured: {}", e) }).unwrap_err(); let x = format!("{}", x); assert_eq!(x, "An error occured: My custom error message");
Implementations on Foreign Types
impl<T, E> ResultExt<T, E> for Result<T, E> where
E: Fail,
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E: Fail,
fn compat(self) -> Result<T, Compat<E>>
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fn context<D>(self, context: D) -> Result<T, Context<D>> where
D: Display + Send + Sync + 'static,
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D: Display + Send + Sync + 'static,
fn with_context<F, D>(self, f: F) -> Result<T, Context<D>> where
F: FnOnce(&E) -> D,
D: Display + Send + Sync + 'static,
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F: FnOnce(&E) -> D,
D: Display + Send + Sync + 'static,
impl<T> ResultExt<T, Error> for Result<T, Error>
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fn compat(self) -> Result<T, Compat<Error>>
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fn context<D>(self, context: D) -> Result<T, Context<D>> where
D: Display + Send + Sync + 'static,
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D: Display + Send + Sync + 'static,
fn with_context<F, D>(self, f: F) -> Result<T, Context<D>> where
F: FnOnce(&Error) -> D,
D: Display + Send + Sync + 'static,
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F: FnOnce(&Error) -> D,
D: Display + Send + Sync + 'static,