Do I have to implement a trait twice when implementing it for both reference and non-reference types?

Question

I want to implement a trait for both a for reference and non-reference type. Do I have to implement the functions twice, or this is not idiomatic to do so?

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Answer 1

This is a good example for the Borrow trait.

use std::borrow::Borrow;

struct Bar;

trait Foo {
    fn hi(&self);
}

impl> Foo for B {
    fn hi(&self) {
        print!("hi")
    }
}

fn main() {
    let bar = Bar;
    (&bar).hi();
    &bar.hi();
}