Impl specialization in Rust

Sat, 11 Apr 2020 00:00:00 +0000

Yesterday I learnt about a feature in Rust, currently only available in nightly: impl specialization.

I had to solve the problem highlighted in the following snippet:

use std::hash::Hash;

trait Foo {
 fn get_foo(&self) -> String;
}

impl<T: Hash> Foo for T {
 fn get_foo(&self) -> String {
 "foo for hash".to_string()
 }
}

impl Foo for String {
 fn get_foo(&self) -> String {
 "foo for string".to_string()
 }
}

fn main() {
 let bar: String = "bar".to_string();
 println!("{}", bar.get_foo());

 let baz: i32 = 1;
 println!("{}", baz.get_foo());
}

Compiling this code gives the below error:

Rust on Lorenzo Bolla

Impl specialization in Rust