Enum ErrorsHashableScalar 

pub enum ErrorsHashableScalar {
    NonFiniteValue {
        backtrace: Backtrace,
    },
}

Error returned when constructing a HashableScalar from an invalid value.

Hash-based collections require keys to implement Eq and Hash. Floating-point NaN values do not satisfy the reflexive equality requirement because NaN != NaN, so they cannot safely be used as hash keys. This error preserves that invariant by rejecting non-finite values during HashableScalar::try_new.

Examples

use num_valid::scalars::{ErrorsHashableScalar, HashableScalar};

let result = HashableScalar::try_new(f64::NAN);
assert!(matches!(
    result,
    Err(ErrorsHashableScalar::NonFiniteValue { .. })
));

See Also

• HashableScalar for the validated hash-key wrapper.
• HashableScalar::try_new for fallible construction.

Variants

NonFiniteValue

The supplied scalar is NaN or infinite.

Non-finite values cannot satisfy the equality contract required by hash-based collections, so HashableScalar::try_new rejects them.

Fields

backtrace: Backtrace

Stack backtrace captured at the invalid construction site.

Trait Implementations

impl Debug for ErrorsHashableScalar

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

Formats the value using the given formatter.

impl Display for ErrorsHashableScalar

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

Formats the value using the given formatter.

impl Error for ErrorsHashableScalar

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

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

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

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