Dyn trait vs impl trait as function parmeter

[boxme]

New to rust and I have been using dynamic dispatch as a function parameter type. But I recently found out that you can do the same with impl Trait.

fn your_func(param: Arc<dyn YourTrait>) {}

vs

fn your_func(param: impl YourTrait) {}

I'd love to learn about when to use one over the other. If you have more than 1 implementation of YourTrait are you still able to do fn your_func(param: impl YourTrait) {}?

[parasyte]

@boxme

If you have more than 1 implementation of YourTrait are you still able to do fn your_func(param: impl YourTrait) {}?

Yes.

Rust Playground

@boxme

I'd love to learn about when to use one over the other.

Use dyn Trait when you want dynamic dispatch. Use impl Trait when you want static dispatch.

dyn Trait vs. alternatives - Learning Rust

Argument-Position impl Trait (APIT) is a gnarly shorthand for generic parameters. You might consider using this instead:

fn your_func<T: YourTrait>(param: T) {}

// or even...

fn your_func<T:>(param: T)
where
    T: YourTrait,
{}