Trait std::iter::DoubleEndedIterator

pub trait DoubleEndedIterator: Iterator {
    fn next_back(&mut self) -> Option<Self::Item>;
}

A range iterator able to yield elements from both ends

A DoubleEndedIterator can be thought of as a deque in that next() and next_back() exhaust elements from the same range, and do not work independently of each other.

Required Methods

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

Yields an element from the end of the range, returning None if the range is empty.

Implementors

• impl<'a, I> DoubleEndedIterator for &'a mut I where I: DoubleEndedIterator + ?Sized
• impl<I> DoubleEndedIterator for Rev<I> where I: DoubleEndedIterator
• impl<'a, I, T> DoubleEndedIterator for Cloned<I> where T: 'a + Clone, I: DoubleEndedIterator<Item=&'a T>
• impl<A, B> DoubleEndedIterator for Chain<A, B> where B: DoubleEndedIterator<Item=A::Item>, A: DoubleEndedIterator
• impl<A, B> DoubleEndedIterator for Zip<A, B> where B: DoubleEndedIterator + ExactSizeIterator, A: DoubleEndedIterator + ExactSizeIterator
• impl<B, I, F> DoubleEndedIterator for Map<I, F> where I: DoubleEndedIterator, F: FnMut(I::Item) -> B
• impl<I, P> DoubleEndedIterator for Filter<I, P> where I: DoubleEndedIterator, P: FnMut(&I::Item) -> bool
• impl<B, I, F> DoubleEndedIterator for FilterMap<I, F> where F: FnMut(I::Item) -> Option<B>, I: DoubleEndedIterator
• impl<I> DoubleEndedIterator for Enumerate<I> where I: ExactSizeIterator + DoubleEndedIterator
• impl<I, U, F> DoubleEndedIterator for FlatMap<I, U, F> where F: FnMut(I::Item) -> U, I: DoubleEndedIterator, U: IntoIterator, U::IntoIter: DoubleEndedIterator
• impl<I> DoubleEndedIterator for Fuse<I> where I: DoubleEndedIterator
• impl<I, F> DoubleEndedIterator for Inspect<I, F> where I: DoubleEndedIterator, F: FnMut(&I::Item) -> ()
• impl<A> DoubleEndedIterator for RangeInclusive<A> where A: PartialEq<A> + Step + One + Clone, &'a A: Add<&'a A>, &'a A: Sub<&'a A>, &'a A::Output == A, &'a A::Output == A
• impl<A> DoubleEndedIterator for Range<A> where A: One + Clone + Step, &'a A: Add<&'a A>, &'a A: Sub<&'a A>, &'a A::Output == A, &'a A::Output == A
• impl<A> DoubleEndedIterator for Repeat<A> where A: Clone
• impl<A> DoubleEndedIterator for Item<A>
• impl<'a, A> DoubleEndedIterator for Iter<'a, A>
• impl<'a, A> DoubleEndedIterator for IterMut<'a, A>
• impl<A> DoubleEndedIterator for IntoIter<A>
• impl<'a, T> DoubleEndedIterator for Iter<'a, T>
• impl<'a, T> DoubleEndedIterator for IterMut<'a, T>
• impl<T> DoubleEndedIterator for IntoIter<T>
• impl<'a, T> DoubleEndedIterator for Iter<'a, T>
• impl<'a, T> DoubleEndedIterator for IterMut<'a, T>
• impl<'a, T, P> DoubleEndedIterator for Split<'a, T, P> where P: FnMut(&T) -> bool
• impl<'a, T, P> DoubleEndedIterator for SplitMut<'a, T, P> where P: FnMut(&T) -> bool
• impl<'a, T> DoubleEndedIterator for Windows<'a, T>
• impl<'a, T> DoubleEndedIterator for Chunks<'a, T>
• impl<'a, T> DoubleEndedIterator for ChunksMut<'a, T>
• impl<'a> DoubleEndedIterator for Chars<'a>
• impl<'a> DoubleEndedIterator for CharIndices<'a>
• impl<'a> DoubleEndedIterator for Bytes<'a>
• impl<'a, P> DoubleEndedIterator for Split<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a, P> DoubleEndedIterator for RSplit<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a, P> DoubleEndedIterator for SplitTerminator<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a, P> DoubleEndedIterator for RSplitTerminator<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a, P> DoubleEndedIterator for MatchIndices<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a, P> DoubleEndedIterator for RMatchIndices<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a, P> DoubleEndedIterator for Matches<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a, P> DoubleEndedIterator for RMatches<'a, P> where P: Pattern<'a>, P::Searcher: DoubleEndedSearcher<'a>
• impl<'a> DoubleEndedIterator for Lines<'a>
• impl<'a> DoubleEndedIterator for LinesAny<'a>
• impl<I> DoubleEndedIterator for Box<I> where I: DoubleEndedIterator + ?Sized
• impl<'a, T> DoubleEndedIterator for Iter<'a, T>
• impl<T> DoubleEndedIterator for IntoIter<T>
• impl<'a, T> DoubleEndedIterator for Drain<'a, T> where T: 'a
• impl<'a> DoubleEndedIterator for Iter<'a>
• impl<T> DoubleEndedIterator for RawItems<T>
• impl<K, V, E, Impl> DoubleEndedIterator for AbsTraversal<Impl> where Impl: TraversalImpl<Item=(K, V), Edge=E>
• impl<K, V, E, T> DoubleEndedIterator for AbsIter<T> where T: DoubleEndedIterator<Item=TraversalItem<K, V, E>> + Traverse<E>
• impl<'a, K, V> DoubleEndedIterator for Iter<'a, K, V>
• impl<'a, K, V> DoubleEndedIterator for IterMut<'a, K, V>
• impl<K, V> DoubleEndedIterator for IntoIter<K, V>
• impl<'a, K, V> DoubleEndedIterator for Keys<'a, K, V>
• impl<'a, K, V> DoubleEndedIterator for Values<'a, K, V>
• impl<'a, K, V> DoubleEndedIterator for Range<'a, K, V>
• impl<'a, K, V> DoubleEndedIterator for RangeMut<'a, K, V>
• impl<'a, T> DoubleEndedIterator for Iter<'a, T>
• impl<T> DoubleEndedIterator for IntoIter<T>
• impl<'a, T> DoubleEndedIterator for Range<'a, T>
• impl<'a, A> DoubleEndedIterator for Iter<'a, A>
• impl<'a, A> DoubleEndedIterator for IterMut<'a, A>
• impl<A> DoubleEndedIterator for IntoIter<A>
• impl<'a> DoubleEndedIterator for Drain<'a>
• impl<T> DoubleEndedIterator for IntoIter<T>
• impl<'a, T> DoubleEndedIterator for Drain<'a, T>
• impl<'a, T> DoubleEndedIterator for Iter<'a, T>
• impl<'a, T> DoubleEndedIterator for IterMut<'a, T>
• impl<T> DoubleEndedIterator for IntoIter<T>
• impl<'a, T> DoubleEndedIterator for Drain<'a, T> where T: 'a
• impl<'a, V> DoubleEndedIterator for Iter<'a, V>
• impl<'a, V> DoubleEndedIterator for IterMut<'a, V>
• impl<'a, V> DoubleEndedIterator for Drain<'a, V>
• impl<'a, V> DoubleEndedIterator for Keys<'a, V>
• impl<'a, V> DoubleEndedIterator for Values<'a, V>
• impl<V> DoubleEndedIterator for IntoIter<V>
• impl<'a> DoubleEndedIterator for GraphemeIndices<'a>
• impl<'a> DoubleEndedIterator for Graphemes<'a>
• impl<'a> DoubleEndedIterator for SplitWhitespace<'a>
• impl DoubleEndedIterator for EscapeDefault
• impl<'a> DoubleEndedIterator for Iter<'a>
• impl<'a> DoubleEndedIterator for Components<'a>