1use crate::hkt::HKT;
2
3pub trait Chain<B>: HKT<B> {
4 fn chain<F>(self, f: F) -> <Self as HKT<B>>::Target
5 where
6 F: FnOnce(<Self as HKT<B>>::Current) -> <Self as HKT<B>>::Target;
7}
8
9impl<A, B> Chain<B> for Option<A> {
10 fn chain<F>(self, f: F) -> Self::Target
11 where
12 F: FnOnce(A) -> <Self as HKT<B>>::Target,
13 {
14 self.and_then(f)
15 }
16}
17
18impl<A, B, E> Chain<B> for Result<A, E> {
19 fn chain<F>(self, f: F) -> Self::Target
20 where
21 F: FnOnce(A) -> <Self as HKT<B>>::Target,
22 {
23 self.and_then(f)
24 }
25}