# WeightedError in rand::distributions::weighted - Rust
Error type returned from `WeightedIndex::new`.
Keywords: rust, rustlang, rust-lang, WeightedError

# Enum rand::distributions::weighted::WeightedError

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

Expand description

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, NaN, 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

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### impl Clone for WeightedError

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#### fn clone(&self) -> WeightedError

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from `source`. Read more

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### impl Debug for WeightedError

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

Formats the value using the given formatter. Read more

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### impl Display for WeightedError

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

Formats the value using the given formatter. Read more

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### impl Error for WeightedError

1.30.0 · source

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

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

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

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

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

1.0.0 · source

#### fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more
1.0.0 · source

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

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

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### impl PartialEq<WeightedError> for WeightedError

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

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

1.0.0 · source

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

This method tests for `!=`.

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### impl Copy for WeightedError

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### impl Eq for WeightedError

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### impl StructuralEq for WeightedError

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### impl StructuralPartialEq for WeightedError

## Auto Trait Implementations

### impl RefUnwindSafe for WeightedError

### impl Send for WeightedError

### impl Sync for WeightedError

### impl Unpin for WeightedError

### impl UnwindSafe for WeightedError

## Blanket Implementations

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### impl<T> Any for T where
T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more

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### impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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### impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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### impl<T> From<T> for T

const: unstable · source

#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T where
U: From<T>,

const: unstable · source

#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for T where
T: Clone,

#### type Owned = T

The resulting type after obtaining ownership.

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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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#### fn clone_into(&self, target: &mut T)

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

Uses borrowed data to replace owned data, usually by cloning. Read more

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### impl<T> ToString for T where
T: Display + ?Sized,

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#### default fn to_string(&self) -> String

Converts the given value to a `String`. Read more

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### impl<T, U> TryFrom<U> for T where
U: Into<T>,

#### type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

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### impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

const: unstable · source

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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### impl<V, T> VZip<V> for T where
V: MultiLane<T>,

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#### fn vzip(self) -> V