Trait itertools::PeekingNext

pub trait PeekingNext: Iterator {
    fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>
    where
        Self: Sized,
        F: FnOnce(&Self::Item) -> bool;
}

An iterator that allows peeking at an element before deciding to accept it.

See .peeking_take_while() for more information.

This is implemented by peeking adaptors like peekable and put back, but also by a few iterators that can be peeked natively, like the slice’s by reference iterator (std::slice::Iter).

Required Methods

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    Self: Sized,
    F: FnOnce(&Self::Item) -> bool,

Pass a reference to the next iterator element to the closure accept; if accept returns true, return it as the next element, else None.

Implementations on Foreign Types

impl<'a, I> PeekingNext for &'a mut Iwhere
    I: PeekingNext,

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<I> PeekingNext for Peekable<I>where
    I: Iterator,

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a, T> PeekingNext for Iter<'a, T>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a> PeekingNext for Chars<'a>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a> PeekingNext for CharIndices<'a>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a> PeekingNext for Bytes<'a>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a, T> PeekingNext for Iter<'a, T>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a, T> PeekingNext for Iter<'a, T>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<T> PeekingNext for Empty<T>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a, T> PeekingNext for Iter<'a, T>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<'a, T> PeekingNext for Iter<'a, T>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

impl<I: Clone + PeekingNext + DoubleEndedIterator> PeekingNext for Rev<I>

fn peeking_next<F>(&mut self, accept: F) -> Option<Self::Item>where
    F: FnOnce(&Self::Item) -> bool,

Implementors

impl<'a, I, F> PeekingNext for PeekingTakeWhile<'a, I, F>where
    I: PeekingNext,
    F: FnMut(&I::Item) -> bool,

impl<I> PeekingNext for MultiPeek<I>where
    I: Iterator,

impl<I> PeekingNext for PeekNth<I>where
    I: Iterator,

impl<I> PeekingNext for PutBack<I>where
    I: Iterator,

impl<I> PeekingNext for PutBackN<I>where
    I: Iterator,