Trait rin::ecs::streaming_iterator::DoubleEndedStreamingIterator

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

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

A streaming iterator able to yield elements from both ends.

Required methods

pub 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

pub 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.

pub fn rfold<B, F>(self, init: B, f: F) -> B where
    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> DoubleEndedStreamingIterator for ConvertMut<'a, I, T> where
    T: ?Sized,
    I: DoubleEndedIterator<Item = &'a mut T>, 

pub fn advance_back(&mut self)

pub fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Fold: FnMut(Acc, &<ConvertMut<'a, I, T> as StreamingIterator>::Item) -> Acc,
    ConvertMut<'a, I, T>: Sized, 

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

pub fn advance_back(&mut self)

pub fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Fold: FnMut(Acc, &<ConvertRef<'a, I, T> as StreamingIterator>::Item) -> Acc,
    ConvertRef<'a, I, T>: Sized, 

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

pub fn advance_back(&mut self)

pub fn rfold<Acc, F>(self, init: Acc, f: F) -> Acc where
    F: FnMut(Acc, &<Chain<A, B> as StreamingIterator>::Item) -> Acc,
    Chain<A, B>: Sized, 

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

pub fn advance_back(&mut self)

pub fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Fold: FnMut(Acc, &<Convert<I> as StreamingIterator>::Item) -> Acc,
    Convert<I>: Sized, 

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

pub fn advance_back(&mut self)

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

pub fn rfold<Acc, Fold>(self, init: Acc, f: Fold) -> Acc where
    Fold: FnMut(Acc, &<Rev<I> as StreamingIterator>::Item) -> Acc,
    Rev<I>: Sized, 

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

pub fn advance_back(&mut self)

pub fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Fold: FnMut(Acc, &<FilterMap<I, B, F> as StreamingIterator>::Item) -> Acc,
    FilterMap<I, B, F>: Sized, 

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

pub fn advance_back(&mut self)

pub fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Fold: FnMut(Acc, &<Map<I, B, F> as StreamingIterator>::Item) -> Acc,
    Map<I, B, F>: Sized, 

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

pub fn advance_back(&mut self)

pub fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Fold: FnMut(Acc, &<Filter<I, F> as StreamingIterator>::Item) -> Acc,
    Filter<I, F>: Sized, 

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

pub fn advance_back(&mut self)

pub fn rfold<Acc, Fold>(self, init: Acc, fold: Fold) -> Acc where
    Fold: FnMut(Acc, &<Inspect<I, F> as StreamingIterator>::Item) -> Acc,
    Inspect<I, F>: Sized, 

impl<T> DoubleEndedStreamingIterator for Empty<T>

pub fn advance_back(&mut self)

impl<T> DoubleEndedStreamingIterator for Once<T>

pub fn advance_back(&mut self)

impl<T> DoubleEndedStreamingIterator for Repeat<T>

pub fn advance_back(&mut self)

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

pub fn advance_back(&mut self)

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