Struct Error 

pub struct Error { /* private fields */ }

An error type that extends anyhow::Error with named fields.

Implementations

impl Error

pub const fn new(error: Error) -> Self

Create a new error from an anyhow error.

pub fn msg<T: Display + Debug + Send + Sync + 'static>(msg: T) -> Self

Create a new error with a message and optional fields.

pub fn with_field<V: Display>(self, key: &'static str, value: V) -> Self

Add a named field to this error.

pub fn with_field_debug<V: Debug>(self, key: &'static str, value: V) -> Self

Add a named field with debug formatting to this error.

pub fn fields(&self) -> &[(&'static str, Box<str>)]

Get the named fields.

pub fn get_field(&self, key: &str) -> Option<&str>

Get a specific field value by key, this is an O(n) operation.

pub fn context<C: Display + Send + Sync + 'static>(self, context: C) -> Self

Add context to this error, see anyhow::Context for more details.

pub fn with_context<C, F>(self, f: F) -> Self

where C: Display + Send + Sync + 'static, F: FnOnce() -> C,

Add context to this error with a closure, see anyhow::Context for more details.

pub fn root_cause(&self) -> &dyn StdError

Get the root cause of this error.

pub fn chain(&self) -> Chain<'_>

Get the chain of errors.

pub fn downcast<E>(self) -> Result<E, Self>

where E: Display + Debug + Send + Sync + 'static,

Downcast the error to a concrete type.

pub fn downcast_ref<E>(&self) -> Option<&E>

where E: Display + Debug + Send + Sync + 'static,

Downcast the error to a reference to a concrete type.

pub fn downcast_mut<E>(&mut self) -> Option<&mut E>

where E: Display + Debug + Send + Sync + 'static,

Downcast the error to a mutable reference to a concrete type.

pub fn is<E>(&self) -> bool

where E: Display + Debug + Send + Sync + 'static,

Check if the error is of a particular type.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

fn source(&self) -> Option<&(dyn StdError + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

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

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<&str> for Error

fn from(msg: &str) -> Self

Converts to this type from the input type.

impl From<Error> for Error

fn from(error: Error) -> Self

Converts to this type from the input type.

impl From<String> for Error

fn from(msg: String) -> Self

Converts to this type from the input type.