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
33
34
35
36
37
38

extern crate ambassador;

use ambassador::{delegatable_trait, Delegate};

#[delegatable_trait]
pub trait Shout1 {
    fn shout(&self, input: &str) -> String;
}

#[delegatable_trait]
pub trait Shout2 {
    fn shout(&self);
}

pub struct Cat;

impl Shout1 for Cat {
    fn shout(&self, input: &str) -> String {
        format!("{} - meow!", input)
    }
}

impl Shout2 for Cat {
    fn shout(&self) {
        println!("meow!")
    }
}

#[derive(Delegate)]
#[delegate(Shout1)]
#[delegate(Shout2)]
struct WrappedCat(Cat);

fn main() {
    let cat = WrappedCat(Cat);
    println!("{}", Shout1::shout(&cat, ""));
    Shout2::shout(&cat);
}