Function nd_iter::iter_2d

pub fn iter_2d<A, B, AIter, BIter>(
    a_iter: AIter, 
    b_iter: BIter
) -> IteratorContainer2d<A, B, AIter, BIter> where
    A: Clone,
    AIter: Iterator<Item = A>,
    BIter: Iterator<Item = B> + Clone,