Zot

Provides Option-like enums for working with ordered collections of zero, one, or two items (Zot), or ordered collections of one or two items (Ot).

let zot = Zot::Two("one", "two");
assert_eq!(zot.last(), Some("two"));
let ot = Ot::One("just one");
assert!(ot.is_one());

Most functionality mimics Option with a few exceptions:

• Some new functions relating to the relative positions have been added:
  • first gets the singular element from *::One or the first element from *::Two. Zot<T> returns an Option<T>, with Zot::Zero returning None.
  • second gets the second element from *::Two. Both Ot<T> and Zot<T> return an Option<T>.
  • last gets the second element from *::Two or the singular element from *::One. Zot<T> returns an Option<T>, Ot<T> returns a T.
  • *_mut, replace_*, and take_* (Zot only) variations are also included.
• Some functions which don't have a clear analogue when working with 2 values are not included (e.g. zip).
• map requires a FnMut parameter instead of FnOnce as the function may need to be called twice.