Crate enum_iterator

Expand description

Overview

Tools to iterate over the values of a type.

Examples

use enum_iterator::{all, cardinality, first, last, next, previous, reverse_all, Sequence};

#[derive(Debug, PartialEq, Sequence)]
enum Day { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday }

assert_eq!(cardinality::<Day>(), 7);
assert_eq!(all::<Day>().collect::<Vec<_>>(), [
    Day::Monday,
    Day::Tuesday,
    Day::Wednesday,
    Day::Thursday,
    Day::Friday,
    Day::Saturday,
    Day::Sunday,
]);
assert_eq!(first::<Day>(), Some(Day::Monday));
assert_eq!(last::<Day>(), Some(Day::Sunday));
assert_eq!(next(&Day::Tuesday), Some(Day::Wednesday));
assert_eq!(previous(&Day::Wednesday), Some(Day::Tuesday));
assert_eq!(reverse_all::<Day>().collect::<Vec<_>>(), [
    Day::Sunday,
    Day::Saturday,
    Day::Friday,
    Day::Thursday,
    Day::Wednesday,
    Day::Tuesday,
    Day::Monday,
]);

use enum_iterator::{cardinality, first, last, Sequence};

#[derive(Debug, PartialEq, Sequence)]
struct Foo {
    a: bool,
    b: u8,
}

assert_eq!(cardinality::<Foo>(), 512);
assert_eq!(first::<Foo>(), Some(Foo { a: false, b: 0 }));
assert_eq!(last::<Foo>(), Some(Foo { a: true, b: 255 }));