mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-08 18:26:48 +00:00
28 lines
475 B
Rust
28 lines
475 B
Rust
use intertrait::cast::*;
|
|
use intertrait::*;
|
|
use std::sync::Arc;
|
|
|
|
#[cast_to([sync, sync] Greet)]
|
|
struct Data;
|
|
|
|
trait Source: CastFromSync {}
|
|
|
|
trait Greet {
|
|
fn greet(&self);
|
|
}
|
|
|
|
impl Greet for Data {
|
|
fn greet(&self) {
|
|
println!("Hello");
|
|
}
|
|
}
|
|
|
|
impl Source for Data {}
|
|
|
|
fn main() {
|
|
let data = Arc::new(Data);
|
|
let source: Arc<dyn Source> = data;
|
|
let greet = source.cast::<dyn Greet>();
|
|
greet.unwrap_or_else(|_| panic!("can't happen")).greet();
|
|
}
|