Trait IntoEnumIterator

Source

pub trait IntoEnumIterator: Sized {
    type Iterator: Iterator<Item = Self> + Clone + DoubleEndedIterator + ExactSizeIterator + FusedIterator;

    // Required method
    fn iter() -> Self::Iterator;
}

Expand description

This trait designates that an Enum can be iterated over. It can be auto generated using the EnumIter derive macro.

§Example

// You need to bring the type into scope to use it!!!
use strum::{EnumIter, IntoEnumIterator};

#[derive(EnumIter, Debug)]
enum Color {
    Red,
    Green { range: usize },
    Blue(usize),
    Yellow,
}

// Iterate over the items in an enum and perform some function on them.
fn generic_iterator<E, F>(pred: F)
where
    E: IntoEnumIterator,
    F: Fn(E),
{
    for e in E::iter() {
        pred(e)
    }
}

generic_iterator::<Color, _>(|color| println!("{:?}", color));