ambassador 0.5.1

Trait implementation delegation via procedural macros
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

extern crate ambassador;

use ambassador::{delegatable_trait, Delegate};

#[delegatable_trait]
pub trait Shout {
    fn shout(&mut self) -> String;
}

pub struct Cat;

impl Shout for Cat {
    fn shout(&mut self) -> String {
        "meow!".to_owned()
    }
}

#[derive(Delegate)]
#[delegate(Shout)]
pub struct WrappedCat(Cat);

#[derive(Delegate)]
#[delegate(Shout)]
pub enum Animals {
    Cat(Cat),
    Wrapped(WrappedCat),
}

pub fn main() {
    let mut foo_animal = Animals::Cat(Cat);
    println!("{}", foo_animal.shout());
}