Function itertools::multipeek

Important traits for MultiPeek<I>

impl<I> Iterator for MultiPeek<I> where
    I: Iterator,  type Item = I::Item;

pub fn multipeek<I>(iterable: I) -> MultiPeek<I::IntoIter> where
    I: IntoIterator, 

An iterator adaptor that allows the user to peek at multiple .next() values without advancing the base iterator.