Struct KeyError

pub struct KeyError { /* private fields */ }

Ruby KeyError error type.

Descendants of class Exception are used to communicate between Kernel#raise and rescue statements in begin ... end blocks. Exception objects carry information about the exception – its type (the exception’s class name), an optional descriptive string, and optional traceback information. Exception subclasses may add additional information like NameError#name.

Implementations

impl KeyError

pub const fn new() -> Self

Construct a new, default KeyError Ruby exception.

This constructor sets the exception message to KeyError.

Examples

let exception = KeyError::new();
assert_eq!(exception.message(), b"KeyError");

pub const fn with_message(message: &'static str) -> Self

Construct a new, KeyError Ruby exception with the given message.

Examples

let exception = KeyError::with_message("an error occurred");
assert_eq!(exception.message(), b"an error occurred");

pub fn message(&self) -> &[u8]

Return the message this Ruby exception was constructed with.

Examples

let exception = KeyError::new();
assert_eq!(exception.message(), b"KeyError");
let exception = KeyError::from("something went wrong");
assert_eq!(exception.message(), b"something went wrong");

pub const fn name(&self) -> &'static str

Return this Ruby exception’s class name.

Examples

let exception = KeyError::new();
assert_eq!(exception.name(), "KeyError");

Trait Implementations

impl Clone for KeyError

fn clone(&self) -> KeyError

Returns a duplicate of the value.

const fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for KeyError

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

Formats the value using the given formatter.

impl Default for KeyError

fn default() -> KeyError

Returns the “default value” for a type.

impl Display for KeyError

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

Formats the value using the given formatter.

impl Error for KeyError

fn source(&self) -> Option<&(dyn Error + '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<&'static [u8]> for KeyError

fn from(message: &'static [u8]) -> Self

Converts to this type from the input type.

impl From<&'static str> for KeyError

fn from(message: &'static str) -> Self

Converts to this type from the input type.

impl From<Cow<'static, [u8]>> for KeyError

fn from(message: Cow<'static, [u8]>) -> Self

Converts to this type from the input type.

impl From<Cow<'static, str>> for KeyError

fn from(message: Cow<'static, str>) -> Self

Converts to this type from the input type.

impl From<String> for KeyError

fn from(message: String) -> Self

Converts to this type from the input type.

impl From<Vec<u8>> for KeyError

fn from(message: Vec<u8>) -> Self

Converts to this type from the input type.

impl Ord for KeyError

fn cmp(&self, other: &KeyError) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for KeyError

fn eq(&self, other: &KeyError) -> bool

Tests for self and other values to be equal, and is used by ==.

const fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for KeyError

fn partial_cmp(&self, other: &KeyError) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl RubyException for KeyError

fn message(&self) -> Cow<'_, [u8]>

The exception’s message.

fn name(&self) -> Cow<'_, str>

The exception’s class name.

impl Eq for KeyError

impl StructuralPartialEq for KeyError