Struct failure::Context

[+] Show declaration

pub struct Context<D: Display + Send + Sync + 'static> { /* fields omitted */ }

[−] Expand description

An error with context around it.

The context is intended to be a human-readable, user-facing explanation for the error that has occurred. The underlying error is not assumed to be end-user-relevant information.

The Display impl for Context only prints the human-readable context, while the Debug impl also prints the underlying error.

Methods

impl<D: Display + Send + Sync + 'static> Context<D>

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pub fn new(context: D) -> Context<D>

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Creates a new context without an underlying error message.

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_context(&self) -> &D

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Returns a reference to the context provided with this error.

Trait Implementations

impl<D: Display + Send + Sync + 'static> Fail for Context<D>

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fn cause(&self) -> Option<&Fail>

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Returns a reference to the underlying cause of this failure, if it is an error that wraps other errors.

fn backtrace(&self) -> Option<&Backtrace>

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Returns a reference to the Backtrace carried by this failure, if it carries one.

fn context<D>(self, context: D) -> Context<D> where     D: Display + Send + Sync + 'static,     Self: Sized,

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Provides context for this failure.

fn compat(self) -> Compat<Self> where     Self: Sized,

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Wraps this failure in a compatibility wrapper that implements std::error::Error.

Important traits for Causes<'f>

impl<'f> Iterator for Causes<'f> type Item = &'f Fail;

fn causes(&self) -> Causes where     Self: Sized,

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Returns a iterator over the causes of this Fail with itself as the first item and the root_cause as the final item.

fn root_cause(&self) -> &Fail where     Self: Sized,

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Returns the "root cause" of this Fail - the last value in the cause chain which does not return an underlying cause.

impl<D: Display + Send + Sync + 'static> Debug for Context<D>

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

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Formats the value using the given formatter.

impl<D: Display + Send + Sync + 'static> Display for Context<D>

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

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Formats the value using the given formatter.

impl<D> From<D> for Context<D> where     D: Display + Send + Sync + 'static,

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fn from(display: D) -> Context<D>

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Performs the conversion.