Struct Take

#[must_use = "iterators are lazy and do nothing unless consumed"]
pub struct Take<I> { pub(in ::iter::adapters::take) iter: I, pub(in ::iter::adapters::take) n: usize }

An iterator that only iterates over the first n iterations of iter.

This struct is created by the take method on Iterator. See its documentation for more.

Fields

iter: I
n: usize

Implementations

impl<I> Take<I>

const fn new(iter: I, n: usize) -> Take<I>

Trait Implementations

impl<F: FnMut() -> A, A> ExactSizeIterator for Take<RepeatWith<F>>

fn len(&self) -> usize

impl<I> DoubleEndedIterator for Take<I> where I: DoubleEndedIterator + ExactSizeIterator,

fn next_back(&mut self) -> Option<Self::Item>
fn nth_back(&mut self, n: usize) -> Option<Self::Item>
fn try_rfold<Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R
where
    Self: Sized,
    Fold: FnMut(Acc, Self::Item) -> R,
    R: Try<Output = Acc>,
fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc
where
    Self: Sized,
    Fold: FnMut(Acc, Self::Item) -> Acc,
fn advance_back_by(&mut self, n: usize) -> Result<(), NonZero<usize>>

impl<I> ExactSizeIterator for Take<I> where I: ExactSizeIterator,

impl<I> FusedIterator for Take<I> where I: FusedIterator,

impl<I> Iterator for Take<I> where I: Iterator,

type Item = <I as Iterator>::Item;
fn next(&mut self) -> Option<<I as Iterator>::Item>
fn nth(&mut self, n: usize) -> Option<I::Item>
fn count(self) -> usize
fn size_hint(&self) -> (usize, Option<usize>)
fn try_fold<Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R
where
    Fold: FnMut(Acc, Self::Item) -> R,
    R: Try<Output = Acc>,
fn fold<B, F>(self, init: B, f: F) -> B
where
    Self: Sized,
    F: FnMut(B, Self::Item) -> B,
fn for_each<F: FnMut(Self::Item)>(self, f: F)
fn advance_by(&mut self, n: usize) -> Result<(), NonZero<usize>>

impl<I> SourceIter for Take<I> where I: SourceIter,

type Source = <I as SourceIter>::Source;
unsafe fn as_inner(&mut self) -> &mut I::Source

impl<I: Clone> Clone for Take<I>

fn clone(&self) -> Take<I>

impl<I: Debug> Debug for Take<I>

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

impl<I: InPlaceIterable> InPlaceIterable for Take<I>

const EXPAND_BY: Option<NonZero<usize>> = I::EXPAND_BY;
const MERGE_BY: Option<NonZero<usize>> = I::MERGE_BY;

impl<I: Iterator + TrustedRandomAccess> SpecTake for Take<I>

fn spec_fold<B, F>(self, init: B, f: F) -> B
where
    Self: Sized,
    F: FnMut(B, Self::Item) -> B,
fn spec_for_each<F: FnMut(Self::Item)>(self, f: F)

impl<I: Iterator> SpecTake for Take<I>

fn spec_fold<B, F>(self, init: B, f: F) -> B
where
    Self: Sized,
    F: FnMut(B, Self::Item) -> B,
fn spec_for_each<F: FnMut(Self::Item)>(self, f: F)

impl<I: TrustedFused> TrustedFused for Take<I>

impl<I: TrustedLen> TrustedLen for Take<I>

impl<T: Clone> DoubleEndedIterator for Take<Repeat<T>>

fn next_back(&mut self) -> Option<Self::Item>
fn nth_back(&mut self, n: usize) -> Option<Self::Item>
fn try_rfold<Acc, Fold, R>(&mut self, init: Acc, fold: Fold) -> R
where
    Self: Sized,
    Fold: FnMut(Acc, Self::Item) -> R,
    R: Try<Output = Acc>,
fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc
where
    Self: Sized,
    Fold: FnMut(Acc, Self::Item) -> Acc,
fn advance_back_by(&mut self, n: usize) -> Result<(), NonZero<usize>>

impl<T: Clone> ExactSizeIterator for Take<Repeat<T>>

fn len(&self) -> usize

Auto Trait Implementations

impl<I> Freeze for Take<I> where I: Freeze,

impl<I> RefUnwindSafe for Take<I> where I: RefUnwindSafe,

impl<I> Send for Take<I> where I: Send,

impl<I> Sync for Take<I> where I: Sync,

impl<I> Unpin for Take<I> where I: Unpin,

impl<I> UnsafeUnpin for Take<I> where I: UnsafeUnpin,

impl<I> UnwindSafe for Take<I> where I: UnwindSafe,

Blanket Implementations

impl<I> IntoIterator for Take<I> where I: Iterator,

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

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Take<I> where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Take<I> where T: ?Sized,

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

impl<T> CloneToUninit for Take<I> where T: Clone,

unsafe fn clone_to_uninit(&self, dest: *mut u8)

impl<T> From<T> for Take<I>

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> SizeHint for Take<I> where T: ?Sized,

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

impl<T> SizedTypeProperties for Take<I>

impl<T, U> Into<U> for Take<I> 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 Take<I> 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 Take<I> where U: TryFrom<T>,

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