TupleTools

Provides utility functions like fst and snd. In development.

Works with #[no_std] !

Example:

```rust

[test]

fn fst() { let x = vec![(2, 3), (3, 4), (4, 5), (5, 6)];

let expected = vec![2, 3, 4, 5];
assert_eq!(x.iter().map(Fst::fst).cloned().collect::<Vec<_>>(), expected);
assert_eq!(x.into_iter().map(Fst::into_fst).collect::<Vec<_>>(), expected);

}

[test]

fn snd() { let x = vec![(2, 3), (3, 4), (4, 5), (5, 6)];

let expected = vec![3, 4, 5, 6];
assert_eq!(x.iter().map(Snd::snd).cloned().collect::<Vec<_>>(), expected);
assert_eq!(x.into_iter().map(Snd::into_snd).collect::<Vec<_>>(), expected);

} ```