Struct ArgumentError

pub struct ArgumentError(/* private fields */);

Error that indicates an argument parsing or value logic error occurred.

Argument errors have an associated message.

This error corresponds to the Ruby ArgumentError Exception class.

Examples

let err = ArgumentError::new();
assert_eq!(err.message(), "ArgumentError");

let err = ArgumentError::with_message("bad environment variable name: contains null byte");
assert_eq!(
    err.message(),
    "bad environment variable name: contains null byte"
);

Implementations

impl ArgumentError

pub const fn new() -> Self

Construct a new, default argument error.

Examples

const ERR: ArgumentError = ArgumentError::new();
assert_eq!(ERR.message(), "ArgumentError");

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

Construct a new, argument error with a message.

Examples

const ERR: ArgumentError =
    ArgumentError::with_message("bad environment variable name: contains null byte");
assert_eq!(
    ERR.message(),
    "bad environment variable name: contains null byte"
);

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

Retrieve the exception message associated with this argument error.

Examples

let err = ArgumentError::new();
assert_eq!(err.message(), "ArgumentError");

let err = ArgumentError::with_message("bad environment variable name: contains null byte");
assert_eq!(
    err.message(),
    "bad environment variable name: contains null byte"
);

Trait Implementations

impl Clone for ArgumentError

fn clone(&self) -> ArgumentError

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ArgumentError

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

Formats the value using the given formatter.

impl Default for ArgumentError

fn default() -> Self

Returns the “default value” for a type.

impl Display for ArgumentError

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

Formats the value using the given formatter.

impl Error for ArgumentError

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 str> for ArgumentError

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

Converts to this type from the input type.

impl From<ArgumentError> for Error

fn from(err: ArgumentError) -> Self

Converts to this type from the input type.

impl From<ConvertBytesError> for ArgumentError

fn from(_err: ConvertBytesError) -> Self

Converts to this type from the input type.

impl Hash for ArgumentError

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for ArgumentError

fn cmp(&self, other: &ArgumentError) -> 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 ArgumentError

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

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

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 ArgumentError

fn partial_cmp(&self, other: &ArgumentError) -> 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 Copy for ArgumentError

impl Eq for ArgumentError

impl StructuralPartialEq for ArgumentError