1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
use super::Operator;
#[cfg(feature = "std")]
pub use facet_map::{facet_map, FacetMap};
#[derive(Debug, Clone, Copy)]
pub struct Facet<I, P1, P2>(
pub(super) P1,
pub(super) P2,
pub(super) core::marker::PhantomData<fn() -> I>,
);
pub fn facet<I, P1, P2>(op1: P1, op2: P2) -> Facet<I, P1, P2> {
Facet(op1, op2, core::marker::PhantomData::default())
}
impl<I: Clone, P1, P2> Operator<I> for Facet<I, P1, P2>
where
P1: Operator<I>,
P2: Operator<I>,
{
type Output = (P1::Output, P2::Output);
fn next(&mut self, input: I) -> Self::Output {
(self.0.next(input.clone()), self.1.next(input))
}
}
#[cfg(feature = "std")]
mod facet_map {
use super::Operator;
use std::collections::HashMap;
use std::hash::Hash;
#[derive(Debug, Clone)]
pub struct FacetMap<I, Q, P>(HashMap<Q, P>, core::marker::PhantomData<fn() -> I>);
impl<I, Q, P> Operator<I> for FacetMap<I, Q, P>
where
I: Clone,
Q: Eq + Hash + Clone,
P: Operator<I>,
{
type Output = HashMap<Q, P::Output>;
fn next(&mut self, input: I) -> Self::Output {
self.0
.iter_mut()
.map(|(k, p)| {
let o = p.next(input.clone());
(k.clone(), o)
})
.collect()
}
}
pub fn facet_map<I, It, Q, P>(ops: It) -> FacetMap<I, Q, P>
where
Q: Eq + Hash + Clone,
It: IntoIterator<Item = (Q, P)>,
{
FacetMap(
ops.into_iter().collect(),
core::marker::PhantomData::default(),
)
}
}