File: specialization-assoc-fns.rs

package info (click to toggle)
rustc 1.85.0%2Bdfsg3-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental, forky, sid, trixie
  • size: 893,396 kB
  • sloc: xml: 158,127; python: 35,830; javascript: 19,497; cpp: 19,002; sh: 17,245; ansic: 13,127; asm: 4,376; makefile: 1,051; perl: 29; lisp: 29; ruby: 19; sql: 11
file content (29 lines) | stat: -rw-r--r-- 493 bytes parent folder | download | duplicates (8) 
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
 
//@ run-pass

// Test that non-method associated functions can be specialized

#![feature(specialization)] //~ WARN the feature `specialization` is incomplete

trait Foo {
    fn mk() -> Self;
}

impl<T: Default> Foo for T {
    default fn mk() -> T {
        T::default()
    }
}

impl Foo for Vec<u8> {
    fn mk() -> Vec<u8> {
        vec![0]
    }
}

fn main() {
    let v1: Vec<i32> = Foo::mk();
    let v2: Vec<u8> = Foo::mk();

    assert!(v1.len() == 0);
    assert!(v2.len() == 1);
}