Struct NumericError

pub struct NumericError {
    number: NonZero<isize>,
}

An error that is expressed as a negative number

Ideally, that constraint should be expressed in the type system to allow the compiler to represent Result<positive_usize, NumericError> as just the isize it originally was. For the time being, this works well enough, and performance evaluation can later be done against a manually implemented newtype around isize that’d be used to represent the Result.

Fields

number: NonZero<isize>

Implementations

impl NumericError

pub const fn from_constant(name: isize) -> Self

Construct a NumericError from a riot_sys constant

As error constants are in their unsigned positive form, this flips the argument’s sign into the negative range.

let err = NumericError::from_constant(riot_sys::ENOTSUP as _);
println!("{:?}", err); // NumericError { number: -61 }

Panics

In debug mode, this ensures that the given error is greater than zero.

pub const fn number(&self) -> isize

Numeric value of the error

pub fn again_is_wouldblock(self) -> Error<Self>

Convert the error into an nb::Error that is nb::Error::WouldBlock if the error is -EAGAIN, and an actual error otherwise.

fn string(&self) -> Option<&'static CStr>

Trait Implementations

impl Debug for NumericError

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

Formats the value using the given formatter.

impl Display for NumericError

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

Formats the value using the given formatter.

impl Error for NumericError

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 Error for NumericError

Available on riot_module_sock_udp and riot_module_sock_aux_local and crate feature with_embedded_nal_async only.

fn kind(&self) -> ErrorKind

Get the kind of this error.

impl From<NameContainsIllegalNull> for NumericError

Available on riot_module_vfs only.

fn from(_: NameContainsIllegalNull) -> NumericError

Converts to this type from the input type.

impl From<NameTooLong> for NumericError

Available on riot_module_vfs only.

fn from(_: NameTooLong) -> NumericError

Converts to this type from the input type.

impl From<NumericError> for Error

Available on riot_module_periph_i2c only.

fn from(err: NumericError) -> Self

Converts to this type from the input type.

impl From<NumericError> for Error

Available on riot_module_gcoap only.

fn from(e: NumericError) -> Error

Converts to this type from the input type.

impl From<NumericError> for Error

Available on riot_module_bluetil_ad only.

fn from(e: NumericError) -> Error

Converts to this type from the input type.

impl PartialEq for NumericError

fn eq(&self, other: &NumericError) -> 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 Eq for NumericError

impl StructuralPartialEq for NumericError

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: 4 bytes