cgp-tests 0.7.0

Context-generic programming meta crate
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
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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143

use core::convert::Infallible;
use core::marker::PhantomData;

use cgp::core::error::ErrorTypeProviderComponent;
use cgp::extra::handler::{
    CanCompute, CanHandle, Computer, ComputerComponent, Handler, HandlerComponent, PipeHandlers,
    Promote, PromoteAsync,
};
use cgp::prelude::*;
use futures::executor::block_on;

#[test]
pub fn test_pipe_computers() {
    #[cgp_new_provider]
    impl<Context, Tag, Field> Computer<Context, Tag, u64> for Multiply<Field>
    where
        Context: HasField<Field, Value = u64>,
    {
        type Output = u64;

        fn compute(context: &Context, _tag: PhantomData<Tag>, input: u64) -> u64 {
            input * context.get_field(PhantomData)
        }
    }

    #[cgp_new_provider]
    impl<Context, Tag, Field> Computer<Context, Tag, u64> for Add<Field>
    where
        Context: HasField<Field, Value = u64>,
    {
        type Output = u64;

        fn compute(context: &Context, _tag: PhantomData<Tag>, input: u64) -> u64 {
            input + context.get_field(PhantomData)
        }
    }

    #[derive(HasField)]
    pub struct MyContext {
        pub foo: u64,
        pub bar: u64,
        pub baz: u64,
    }

    delegate_components! {
        MyContext {
            ComputerComponent:
                PipeHandlers<
                    Product! [
                        Multiply<Symbol!("foo")>,
                        Add<Symbol!("bar")>,
                        Multiply<Symbol!("baz")>,
                    ]
                >,
        }
    }

    check_components! {
        <Tag>
        MyContext {
            ComputerComponent: (Tag, u64),
        }
    }

    let context = MyContext {
        foo: 2,
        bar: 3,
        baz: 4,
    };

    let result = context.compute(PhantomData::<()>, 5);

    assert_eq!(result, ((5 * 2) + 3) * 4);
}

#[test]
pub fn test_pipe_handlers() {
    #[cgp_new_provider]
    impl<Context, Tag, Field> Handler<Context, Tag, u64> for Multiply<Field>
    where
        Context: HasErrorType + HasField<Field, Value = u64>,
    {
        type Output = u64;

        async fn handle(
            context: &Context,
            _tag: PhantomData<Tag>,
            input: u64,
        ) -> Result<Self::Output, Context::Error> {
            Ok(input * context.get_field(PhantomData))
        }
    }

    #[cgp_new_provider]
    impl<Context, Tag, Field> Computer<Context, Tag, u64> for Add<Field>
    where
        Context: HasField<Field, Value = u64>,
    {
        type Output = u64;

        fn compute(context: &Context, _tag: PhantomData<Tag>, input: u64) -> u64 {
            input + context.get_field(PhantomData)
        }
    }

    #[derive(HasField)]
    pub struct MyContext {
        pub foo: u64,
        pub bar: u64,
        pub baz: u64,
    }

    delegate_components! {
        MyContext {
            ErrorTypeProviderComponent: UseType<Infallible>,
            HandlerComponent:
                PipeHandlers<
                    Product! [
                        Multiply<Symbol!("foo")>,
                        PromoteAsync<Promote<Add<Symbol!("bar")>>>,
                        Multiply<Symbol!("baz")>,
                    ]
                >,
        }
    }

    check_components! {
        <Tag>
        MyContext {
            HandlerComponent: (Tag, u64),
        }
    }

    let context = MyContext {
        foo: 2,
        bar: 3,
        baz: 4,
    };

    let result = block_on(context.handle(PhantomData::<()>, 5)).unwrap();

    assert_eq!(result, ((5 * 2) + 3) * 4);
}