Struct ValueError

pub struct ValueError<T> { /* private fields */ }

Helper type that is core::error::Error and wraps a value and an error message.

This can be used to return an object as part of an Err and is used for fallible conversions.

Implementations

impl<T> ValueError<T>

pub fn new(value: T, msg: impl Display) -> Self

Creates a new error with the given value and error message.

pub fn new_static(value: T, msg: &'static str) -> Self

Creates a new error with a static error message.

pub fn convert<U>(self) -> ValueError<U>

where U: From<T>,

Converts the value to the given alternative that is From<T>.

pub fn map<U>(self, f: impl FnOnce(T) -> U) -> ValueError<U>

Maps the error’s value with the given closure.

pub fn into_value(self) -> T

Consumes the type and returns the underlying value.

pub const fn value(&self) -> &T

Returns a reference to the value.

Trait Implementations

impl<T: Debug> Debug for ValueError<T>

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

Formats the value using the given formatter.

impl<T> Display for ValueError<T>

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

Formats the value using the given formatter.

impl<T> Error for ValueError<T>

where Self: Debug + Display,

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.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes