list_fn/
map_result.rs

1use super::*;
2
3pub trait MapResultFn {
4    type Input;
5    type Output;
6    fn map(self, input: Self::Input) -> Self::Output;
7}
8
9pub struct MapResultList<I, E>
10where
11    I: ListFn,
12    I::End: ResultFn,
13    E: MapResultFn<Input = <I::End as ResultFn>::Result>,
14{
15    input: I,
16    map: E,
17}
18
19impl<I, E> ListFn for MapResultList<I, E>
20where
21    I: ListFn,
22    I::End: ResultFn,
23    E: MapResultFn<Input = <I::End as ResultFn>::Result>,
24{
25    type Item = I::Item;
26    type End = Id<E::Output>;
27    fn next(self) -> ListState<Self> {
28        match self.input.next() {
29            ListState::Some(some) => ListState::some(
30                some.first,
31                MapResultList {
32                    input: some.next,
33                    map: self.map,
34                },
35            ),
36            ListState::End(end) => ListState::End(Id::new(self.map.map(end.result()))),
37        }
38    }
39}
40
41pub trait MapResult
42where
43    Self: ListFn,
44    Self::End: ResultFn,
45{
46    fn map_result<E: MapResultFn<Input = <Self::End as ResultFn>::Result>>(
47        self,
48        map: E,
49    ) -> MapResultList<Self, E> {
50        MapResultList { input: self, map }
51    }
52}
53
54impl<T> MapResult for T
55where
56    T: ListFn,
57    T::End: ResultFn,
58{
59}
list_fn/map_result.rs

list_fn/
map_result.rs
