Trait map_for::FlatMap
[−]
[src]
pub trait FlatMap<Item> { type Item; fn flat_map<U, F>(self, f: F) -> Option<U>
where
F: FnOnce(Self::Item) -> Option<U>; }
This trait creates a flat_map
method for Option
(equivalent to
Option::and_then
) so that it can be used in the map_for
macro.
Example:
use map_for::FlatMap; let c = map_for!{ a <- Some (1); b <- Some (2); => a+b }; assert_eq!(c, Some (3));