Generic Associated Type

Refs

• The push for GATs stabilization
• Generic associated types to be stable in Rust 1.65
• RFC

use std::{sync::Arc, ops::Deref, rc::Rc};

trait PointerFamily {
    type Pointer<T>: Deref<Target = T>;
    fn new<T>(value: T) -> Self::Pointer<T>;
}

struct ArcFamily;

impl PointerFamily for ArcFamily {
    type Pointer<T> = Arc<T>;
    fn new<T>(value: T) -> Self::Pointer<T> {
        Arc::new(value)
    }
}

struct RcFamily;

impl PointerFamily for RcFamily {
    type Pointer<T> = Rc<T>;
    fn new<T>(value: T) -> Self::Pointer<T> {
        Rc::new(value)
    }
}

fn main() {
    let arc = ArcFamily::new("hello");
    println!("{}", arc.len());
}