Derive Macro strum_macros::EnumIter
source · [−]#[derive(EnumIter)]
{
// Attributes available to this derive:
#[strum]
}
Expand description
Creates a new type that iterates of the variants of an enum.
Iterate over the variants of an Enum. Any additional data on your variants will be set to Default::default()
.
The macro implements strum::IntoEnumIter
on your enum and creates a new type called YourEnumIter
that is the iterator object.
You cannot derive EnumIter
on any type with a lifetime bound (<'a>
) because the iterator would surely
create unbounded lifetimes.
// You need to bring the trait into scope to use it!
use strum::IntoEnumIterator;
use strum_macros::EnumIter;
#[derive(EnumIter, Debug, PartialEq)]
enum Color {
Red,
Green { range: usize },
Blue(usize),
Yellow,
}
// It's simple to iterate over the variants of an enum.
for color in Color::iter() {
println!("My favorite color is {:?}", color);
}
let mut ci = Color::iter();
assert_eq!(Some(Color::Red), ci.next());
assert_eq!(Some(Color::Green {range: 0}), ci.next());
assert_eq!(Some(Color::Blue(0)), ci.next());
assert_eq!(Some(Color::Yellow), ci.next());
assert_eq!(None, ci.next());