Trait streaming_iterator::DoubleEndedStreamingIterator

pub trait DoubleEndedStreamingIterator: StreamingIterator {
    fn advance_back(&mut self);

    fn next_back(&mut self) -> Option<&Self::Item> { ... }
    fn rfold<B, F>(self, init: B, f: F) -> B
    where
        Self: Sized,
        F: FnMut(B, &Self::Item) -> B,
    { ... }
}

A streaming iterator able to yield elements from both ends.

Required methods

fn advance_back(&mut self)

Advances the iterator to the next element from the back of the iterator.

Double ended iterators just after the last element, so this should be called before get when iterating in reverse.

The behavior of calling this method after the iterator has been exhausted is unspecified.

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Provided methods

fn next_back(&mut self) -> Option<&Self::Item>

Advances the iterator and returns the next value from the back.

The behavior of calling this method after the iterator has been exhausted is unspecified.

The default implementation simply calls advance_back followed by get.

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

Reduces the iterator’s elements to a single, final value, starting from the back.

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Implementors

impl<'a, I, T: ?Sized> DoubleEndedStreamingIterator for ConvertMut<'a, I, T> where
    I: DoubleEndedIterator<Item = &'a mut T>, 

fn advance_back(&mut self)

fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<'a, I, T: ?Sized> DoubleEndedStreamingIterator for ConvertRef<'a, I, T> where
    I: DoubleEndedIterator<Item = &'a T>, 

fn advance_back(&mut self)

fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<A, B> DoubleEndedStreamingIterator for Chain<A, B> where
    A: DoubleEndedStreamingIterator,
    B: DoubleEndedStreamingIterator<Item = A::Item>, 

fn advance_back(&mut self)

fn rfold<Acc, F>(self, init: Acc, f: F) -> Acc where
    Self: Sized,
    F: FnMut(Acc, &Self::Item) -> Acc, 

impl<I> DoubleEndedStreamingIterator for Convert<I> where
    I: DoubleEndedIterator, 

fn advance_back(&mut self)

fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<I> DoubleEndedStreamingIterator for Rev<I> where
    I: DoubleEndedStreamingIterator, 

fn advance_back(&mut self)

fn next_back(&mut self) -> Option<&I::Item>

fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<I, B, F> DoubleEndedStreamingIterator for FilterMap<I, B, F> where
    I: DoubleEndedStreamingIterator,
    F: FnMut(&I::Item) -> Option<B>, 

fn advance_back(&mut self)

fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<I, B, F> DoubleEndedStreamingIterator for Map<I, B, F> where
    I: DoubleEndedStreamingIterator,
    F: FnMut(&I::Item) -> B, 

fn advance_back(&mut self)

fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<I, F> DoubleEndedStreamingIterator for Filter<I, F> where
    I: DoubleEndedStreamingIterator,
    F: FnMut(&I::Item) -> bool, 

fn advance_back(&mut self)

fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<I, F> DoubleEndedStreamingIterator for Inspect<I, F> where
    I: DoubleEndedStreamingIterator,
    F: FnMut(&I::Item), 

fn advance_back(&mut self)

fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Self: Sized,
    Fold: FnMut(Acc, &Self::Item) -> Acc, 

impl<T> DoubleEndedStreamingIterator for Empty<T>

fn advance_back(&mut self)

impl<T> DoubleEndedStreamingIterator for Once<T>

fn advance_back(&mut self)

impl<T> DoubleEndedStreamingIterator for Repeat<T>

fn advance_back(&mut self)

impl<T, F: FnOnce() -> T> DoubleEndedStreamingIterator for OnceWith<T, F>

fn advance_back(&mut self)

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