Trait dangerous::error::Context

pub trait Context: Any {
    pub fn operation(&self) -> &'static str;
    pub fn has_expected(&self) -> bool;
    pub fn expected(&self, w: &mut dyn Write) -> Result;
    pub fn as_any(&self) -> &dyn Any;
}

The base context surrounding an error.

Required methods

pub fn operation(&self) -> &'static str

The operation that was attempted when an error occurred.

It should described in a simple manner what is trying to be achieved and make sense in the following sentence if you were to substitute it:

error attempting to <operation>.

pub fn has_expected(&self) -> bool

Returns true if there is an expected value.

pub fn expected(&self, w: &mut dyn Write) -> Result

The expected value.

Errors

Returns a fmt::Error if failed to write to the formatter.

pub fn as_any(&self) -> &dyn Any

Return a reference of self as Any.

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Implementations on Foreign Types

impl Context for &'static str

pub fn operation(&self) -> &'static str

pub fn has_expected(&self) -> bool

pub fn expected(&self, w: &mut dyn Write) -> Result

pub fn as_any(&self) -> &dyn Any

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Implementors

impl Context for ExpectedContext

pub fn operation(&self) -> &'static str

pub fn has_expected(&self) -> bool

pub fn expected(&self, w: &mut dyn Write) -> Result

pub fn as_any(&self) -> &dyn Any

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