5 /// Returns `Some(t)` if the `bool` is [`true`](../std/keyword.true.html),
6 /// or `None` otherwise.
11 /// #![feature(bool_to_option)]
13 /// assert_eq!(false.then_some(0), None);
14 /// assert_eq!(true.then_some(0), Some(0));
16 #[unstable(feature = "bool_to_option", issue = "80967")]
18 pub fn then_some<T>(self, t: T) -> Option<T> {
19 if self { Some(t) } else { None }
22 /// Returns `Some(f())` if the `bool` is [`true`](../std/keyword.true.html),
23 /// or `None` otherwise.
28 /// assert_eq!(false.then(|| 0), None);
29 /// assert_eq!(true.then(|| 0), Some(0));
31 #[stable(feature = "lazy_bool_to_option", since = "1.50.0")]
33 pub fn then<T, F: FnOnce() -> T>(self, f: F) -> Option<T> {
34 if self { Some(f()) } else { None }