cgp-handler 0.7.0

Generalized handler interfaces for functional programming
Documentation 
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

use core::marker::PhantomData;

use cgp_core::component::UseDelegate;
use cgp_core::prelude::*;

use crate::UseInputDelegate;

#[cgp_component {
    provider: Computer,
    derive_delegate: [
        UseDelegate<Code>,
        UseInputDelegate<Input>,
    ],
}]
pub trait CanCompute<Code, Input> {
    type Output;

    fn compute(&self, _code: PhantomData<Code>, input: Input) -> Self::Output;
}

#[cgp_component {
    provider: ComputerRef,
    derive_delegate: [
        UseDelegate<Code>,
        UseInputDelegate<Input>,
    ],
}]
pub trait CanComputeRef<Code, Input> {
    type Output;

    fn compute_ref(&self, _code: PhantomData<Code>, input: &Input) -> Self::Output;
}

#[cgp_provider]
impl<Context, Code, Input, Tag, Output> Computer<Context, Code, Input> for UseField<Tag>
where
    Context: HasField<Tag>,
    Context::Value: CanCompute<Code, Input, Output = Output>,
{
    type Output = Output;

    fn compute(context: &Context, code: PhantomData<Code>, input: Input) -> Output {
        context.get_field(PhantomData).compute(code, input)
    }
}