failure

Struct Context

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

Implementations§

Source§

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

Source

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

Creates a new context without an underlying error message.

Source

pub fn get_context(&self) -> &D

Returns a reference to the context provided with this error.

Source

pub fn map<F, T>(self, op: F) -> Context<T>
where F: FnOnce(D) -> T, T: Display + Send + Sync + 'static,

Maps Context<D> to Context<T> by applying a function to the contained context.

Trait Implementations§

Source§

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

Source§

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

Formats the value using the given formatter. Read more
Source§

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

Source§

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

Formats the value using the given formatter. Read more
Source§

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

Source§

fn name(&self) -> Option<&str>

Returns the “name” of the error. Read more
Source§

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

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

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

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

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

Provides context for this failure. Read more
Source§

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

Wraps this failure in a compatibility wrapper that implements std::error::Error. Read more
Source§

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

Source§

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

Converts to this type from the input type.

Auto Trait Implementations§

§

impl<D> !Freeze for Context<D>

§

impl<D> !RefUnwindSafe for Context<D>

§

impl<D> Send for Context<D>

§

impl<D> Sync for Context<D>

§

impl<D> Unpin for Context<D>
where D: Unpin,

§

impl<D> !UnwindSafe for Context<D>

Blanket Implementations§

Source§

impl<T> Any for T
where T: 'static + ?Sized,

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> AsFail for T
where T: Fail,

Source§

fn as_fail(&self) -> &(dyn Fail + 'static)

Converts a reference to Self into a dynamic trait object of Fail.
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

impl<T> From<!> for T

Source§

fn from(t: !) -> T

Converts to this type from the input type.
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T, U> Into<U> for T
where U: From<T>,

Source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source§

impl<T> ToString for T
where T: Display + ?Sized,

Source§

default fn to_string(&self) -> String

Converts the given value to a String. Read more
Source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.