Trait StepByBackImpl

pub(in ::iter::adapters::step_by) unsafe trait StepByBackImpl<I>

Specialization trait for double-ended iteration.

See also: StepByImpl

Safety

The specializations must be implemented together with StepByImpl where applicable. I.e. if StepBy does support backwards iteration for a given iterator and that is specialized for forward iteration then it must also be specialized for backwards iteration.

Associated Types

type Item;

Required Methods

fn spec_next_back(&mut self) -> Option<Self::Item>
where
    I: DoubleEndedIterator + ExactSizeIterator,
fn spec_nth_back(&mut self, n: usize) -> Option<Self::Item>
where
    I: DoubleEndedIterator + ExactSizeIterator,
fn spec_try_rfold<Acc, F, R>(&mut self, init: Acc, f: F) -> R
where
    I: DoubleEndedIterator + ExactSizeIterator,
    F: FnMut(Acc, Self::Item) -> R,
    R: Try<Output = Acc>,
fn spec_rfold<Acc, F>(self, init: Acc, f: F) -> Acc
where
    I: DoubleEndedIterator + ExactSizeIterator,
    F: FnMut(Acc, Self::Item) -> Acc,

Implementors