itertools::iproduct!
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macro_rules! iproduct { ($I:expr) => { ... }; ($I:expr, $J:expr) => { ... }; ($I:expr, $J:expr, $($K:expr),+) => { ... }; }
Create an iterator over the “cartesian product” of iterators.
Iterator element type is like (A, B, ..., E) if formed from iterators (I, J, ..., M) with element types I::Item = A, J::Item = B, etc.
Example
#[macro_use] extern crate itertools; // Iterate over the coordinates of a 4 x 4 x 4 grid // from (0, 0, 0), (0, 0, 1), .., (0, 1, 0), (0, 1, 1), .. etc until (3, 3, 3) for (i, j, k) in iproduct!(0..4, 0..4, 0..4) { // .. }