Enum rand::distributions::weighted::WeightedError

pub enum WeightedError {
    NoItem,
    InvalidWeight,
    AllWeightsZero,
    TooMany,
}

Error type returned from WeightedIndex::new.

Variants

NoItem

The provided weight collection contains no items.

InvalidWeight

A weight is either less than zero, greater than the supported maximum or otherwise invalid.

AllWeightsZero

All items in the provided weight collection are zero.

TooMany

Too many weights are provided (length greater than u32::MAX)

Trait Implementations

impl Clone for WeightedError

fn clone(&self) -> WeightedError

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for WeightedError

impl Debug for WeightedError

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

Formats the value using the given formatter.

impl Display for WeightedError

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

Formats the value using the given formatter.

impl Eq for WeightedError

impl Error for WeightedError

fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any.

fn backtrace(&self) -> Option<&Backtrace>

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

Returns a stack backtrace, if available, of where this error occurred.

fn description(&self) -> &str

Deprecated since 1.41.0:

use the Display impl or to_string()

if let Err(e) = "xc".parse::<u32>() { // Print e itself, no need for description(). eprintln!("Error: {}", e); }

fn cause(&self) -> Option<&dyn Error>

Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

impl PartialEq<WeightedError> for WeightedError

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

This method tests for self and other values to be equal, and is used by ==.

#[must_use] fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl StructuralEq for WeightedError

impl StructuralPartialEq for WeightedError