Function iter_num_tools::grid

pub fn grid<T>(range: Range<(T, T)>) -> impl Iterator<Item = (T, T)> where
    T: Clone,
    Range<T>: Itertools + Iterator<Item = T>, 

Creates a grid of 2-tuples over the range of 2-tuples

use iter_num_tools::grid;
use itertools::Itertools;

let it = grid((0, 0)..(2, 3));
itertools::assert_equal(it, vec![
    (0, 0), (0, 1), (0, 2),
    (1, 0), (1, 1), (1, 2),
]);