Struct IntoKeys

pub struct IntoKeys<K, V, A: Allocator = Global> { pub(in ::collections::hash::map) inner: IntoIter<K, V, A> }

An owning iterator over the keys of a HashMap.

This struct is created by the into_keys method on HashMap. See its documentation for more.

Example

use std::collections::HashMap;

let map = HashMap::from([
    ("a", 1),
]);
let iter_keys = map.into_keys();

Fields

inner: IntoIter<K, V, A>

Trait Implementations

impl<K, V> Default for IntoKeys<K, V>

fn default() -> Self

impl<K, V, A: Allocator> ExactSizeIterator for IntoKeys<K, V, A>

fn len(&self) -> usize

impl<K, V, A: Allocator> FusedIterator for IntoKeys<K, V, A>

impl<K, V, A: Allocator> Iterator for IntoKeys<K, V, A>

type Item = K;
fn next(&mut self) -> Option<K>
fn size_hint(&self) -> (usize, Option<usize>)
fn count(self) -> usize
fn fold<B, F>(self, init: B, f: F) -> B
where
    Self: Sized,
    F: FnMut(B, Self::Item) -> B,

impl<K: Debug, V, A: Allocator> Debug for IntoKeys<K, V, A>

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

Auto Trait Implementations

impl<K, V, A> Freeze for IntoKeys<K, V, A> where IntoIter<K, V, A>: Freeze,

impl<K, V, A> RefUnwindSafe for IntoKeys<K, V, A> where IntoIter<K, V, A>: RefUnwindSafe,

impl<K, V, A> Send for IntoKeys<K, V, A> where IntoIter<K, V, A>: Send,

impl<K, V, A> Sync for IntoKeys<K, V, A> where IntoIter<K, V, A>: Sync,

impl<K, V, A> Unpin for IntoKeys<K, V, A> where IntoIter<K, V, A>: Unpin,

impl<K, V, A> UnsafeUnpin for IntoKeys<K, V, A> where IntoIter<K, V, A>: UnsafeUnpin,

impl<K, V, A> UnwindSafe for IntoKeys<K, V, A> where IntoIter<K, V, A>: UnwindSafe,

Blanket Implementations

impl<I> IntoIterator for IntoKeys<K, V, A> where I: Iterator,

type Item = <I as Iterator>::Item;
type IntoIter = I;
fn into_iter(self) -> I

impl<T> Any for IntoKeys<K, V, A> where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for IntoKeys<K, V, A> where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for IntoKeys<K, V, A> where T: ?Sized,

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

impl<T> From<T> for IntoKeys<K, V, A>

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> SizeHint for IntoKeys<K, V, A> where T: ?Sized,

fn lower_bound(&self) -> usize
fn upper_bound(&self) -> Option<usize>

impl<T> SizedTypeProperties for IntoKeys<K, V, A>

impl<T, U> Into<U> for IntoKeys<K, V, A> where U: From<T>,

fn into(self) -> U

Calls U::from(self).

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

impl<T, U> TryFrom<U> for IntoKeys<K, V, A> where U: Into<T>,

type Error = Infallible;
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for IntoKeys<K, V, A> where U: TryFrom<T>,

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