Trait core::iter::ExactSizeIteratorStable

pub trait ExactSizeIterator: Iterator {
    fn len(&self) -> usize { ... }
}

An iterator that knows its exact length

This trait is a helper for iterators like the vector iterator, so that it can support double-ended enumeration.

Iterator::size_hint must return the exact size of the iterator. Note that the size must fit in uint.

Provided Methods

fn len(&self) -> usize

Return the exact length of the iterator.

Implementors

• impl<Idx: Clone + Step> ExactSizeIterator for Range<Idx>
• impl<I> ExactSizeIterator for Enumerate<I> where I: ExactSizeIterator
• impl<A, I, F> ExactSizeIterator for Inspect<A, I, F> where I: ExactSizeIterator<Item=A>, F: FnMut(&A)
• impl<I> ExactSizeIterator for Rev<I> where I: ExactSizeIterator + DoubleEndedIterator
• impl<A, B, I, F> ExactSizeIterator for Map<A, B, I, F> where I: ExactSizeIterator<Item=A>, F: FnMut(A) -> B
• impl<A, B> ExactSizeIterator for Zip<A, B> where A: ExactSizeIterator, B: ExactSizeIterator
• impl<T, D, I> ExactSizeIterator for Cloned<I> where T: Clone, D: Deref<Target=T>, I: ExactSizeIterator<Item=D>
• impl<'a, A> ExactSizeIterator for Iter<'a, A>
• impl<'a, A> ExactSizeIterator for IterMut<'a, A>
• impl<A> ExactSizeIterator for IntoIter<A>
• impl<'a, T> ExactSizeIterator for Iter<'a, T>
• impl<'a, T> ExactSizeIterator for IterMut<'a, T>
• impl<T> ExactSizeIterator for IntoIter<T>
• impl<'a, T> ExactSizeIterator for Iter<'a, T>
• impl<'a, T> ExactSizeIterator for IterMut<'a, T>
• impl<'a> ExactSizeIterator for Bytes<'a>