# IndexVec in rand::seq::index - Rust
A vector of indices.
Keywords: rust, rustlang, rust-lang, IndexVec

# Enum rand::seq::index::IndexVec

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    pub enum IndexVec {
        // some variants omitted
    }

Expand description

A vector of indices.

Multiple internal representations are possible.

## Implementations

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### impl IndexVec

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#### pub fn len(&self) -> usize

Returns the number of indices

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#### pub fn is_empty(&self) -> bool

Returns `true` if the length is 0.

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#### pub fn index(&self, index: usize) -> usize

Return the value at the given `index`.

(Note: we cannot implement `std::ops::Index` because of lifetime restrictions.)

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#### pub fn into_vec(self) -> Vec<usize>

Return result as a `Vec<usize>`. Conversion may or may not be trivial.

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#### pub fn iter(&self) -> IndexVecIter<'_>ⓘNotable traits for IndexVecIter<'a>`impl<'a> Iterator for IndexVecIter<'a> type Item = usize;`

Iterate over the indices as a sequence of `usize` values

## Trait Implementations

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### impl Clone for IndexVec

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

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 IndexVec

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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 From<Vec<u32, Global>> for IndexVec

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#### fn from(v: Vec<u32>) -> Self

Converts to this type from the input type.

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### impl From<Vec<usize, Global>> for IndexVec

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#### fn from(v: Vec<usize>) -> Self

Converts to this type from the input type.

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### impl IntoIterator for IndexVec

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#### fn into_iter(self) -> IndexVecIntoIter ⓘNotable traits for IndexVecIntoIter `impl Iterator for IndexVecIntoIter type Item = usize;`

Convert into an iterator over the indices as a sequence of `usize` values

#### type Item = usize

The type of the elements being iterated over.

#### type IntoIter = IndexVecIntoIter

Which kind of iterator are we turning this into?

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### impl PartialEq<IndexVec> for IndexVec

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

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

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

This method tests for `!=`.

## Auto Trait Implementations

### impl RefUnwindSafe for IndexVec

### impl Send for IndexVec

### impl Sync for IndexVec

### impl Unpin for IndexVec

### impl UnwindSafe for IndexVec

## 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, 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