Function permutator::self_cartesian_product

pub fn self_cartesian_product<'a, T, F>(set: &'a [T], n: usize, cb: F) where
    T: 'a,
    for<'r> F: FnMut(&'r [&'a T]) + 'a, 

Create a cartesian product over itself. The result will be a slice of borrowed T.

Parameters

• set A slice of slice(s) contains T elements.
• n How many time to create a product over set
• cb A callback function. It will be called on each product.

Return

A function return a slice of borrowed T element out of parameter sets. It return value as parameter of callback function cb.

Examples

To print all cartesian product between [1, 2, 3] and [4, 5, 6].

   use permutator::self_cartesian_product;
 
   self_cartesian_product(&[1, 2, 3], 3, |product| {
       // First called will receive [1, 4] then [1, 5] then [1, 6]
       // then [2, 4] then [2, 5] and so on until [3, 6].
       println!("{:?}", product);
   });