TupleTools

Provides utility functions like fst and snd. In development.

Works with #[no_std] !

Examples:

```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).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).collect::<Vec<_>>(), expected);

}

[test]

fn sub() { let x = vec![(1, 2, 1), (1, 1, 1)]; let y = (1, 1, 1); let z = (1, 1, 1);

assert_eq!(y.sub(z), (0, 0, 0));

assert_eq!(x.into_iter().fold((0, 0, 0), |a, b| a.sub(b)), (-2, -3, -2));

}

[test]

fn div() { let x = vec![(1, 2, 1), (1, 1, 1)]; let y = (1, 1, 1); let z = (1, 1, 1);

assert_eq!(y.div(z), (1, 1, 1));

assert_eq!(
    x.into_iter().fold((1, 1, 1), |a, b| a.div(b)),
    (1, 1 / 2, 1)
);

}

[test]

fn castoneto_one() { let x: (u32, u32, u32, u32, u32, u32) = (3, 4, 5, 6, 7, 8); let _z: (u64, u64, u64, u64, u64, u64) = x.cast(); }

```