Trait frunk::coproduct::CoproductSelector

pub trait CoproductSelector<S, I> {
    fn get(&self) -> Option<&S>;
}

Trait for retrieving a coproduct element reference by type.

Returns an Option<&YourType> (notice that the inside of the option is a reference)

Example

type I32Bool = Coprod!(i32, f32);

let co1 = I32Bool::inject(42f32);

let get_from_1a: Option<&i32> = co1.get();
let get_from_1b: Option<&f32> = co1.get();
assert_eq!(get_from_1a, None);
assert_eq!(get_from_1b, Some(&42f32));

Required Methods

fn get(&self) -> Option<&S>

Implementors

• impl<Head, Tail> CoproductSelector<Head, Here> for Coproduct<Head, Tail>
• impl<Head, FromTail, Tail, TailIndex> CoproductSelector<FromTail, There<TailIndex>> for Coproduct<Head, Tail> where
    Tail: CoproductSelector<FromTail, TailIndex>,