penum 0.1.30

Make enum conform to a given pattern
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

#![allow(dead_code)]
extern crate penum;
use penum::penum;

struct Al;
struct Be(i32);
struct Ce(String);

#[penum]
trait Echo {
    fn echo(&self) -> String;
}

#[penum]
trait Special {
    fn ret(&self) -> Option<&String>;
}

#[penum]
trait AsInner<T> {
    fn as_inner(&self) -> &T;
}

impl Special for Ce {
    fn ret(&self) -> Option<&String> {
        Some(&self.0)
    }
}

impl AsInner<i32> for Be {
    fn as_inner(&self) -> &i32 {
        &self.0
    }
}

#[penum(_ where Ce: ^Special, Be: ^AsInner<i32>)]
enum Foo {
    V1(Al),
    V2(i32, Be),
    V3(Ce),
    V4 {
        name: String,
        age: Be,
        country: String,
    },
    V5(Be, i32),
    V6(i32, i32, Be, i32),
    // V7(i32, Be, Be, i32), // TODO: Fix unreachable pattern
}

fn main() {}