Function enum_iterator::previous_cycle
source · [−]Expand description
Returns the previous value of type T
or T::last()
if this was the beginning.
Example
use enum_iterator::{previous_cycle, Sequence};
#[derive(Debug, PartialEq, Sequence)]
enum Day { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday }
assert_eq!(previous_cycle(&Day::Monday), Some(Day::Sunday));