pub fn previous<T: Sequence>(x: &T) -> Option<T>Expand description
Returns the previous value of type T or None if this was the beginning.
Same as Sequence::previous.
ยงExample
use enum_iterator::{previous, Sequence};
#[derive(Debug, PartialEq, Sequence)]
enum Day { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday }
assert_eq!(previous(&Day::Saturday), Some(Day::Friday));