1 июн. 2018 г. · "dyn" is short for "dynamic" and refers to the fact that trait objects perform dynamic dispatch. This means that the decision of exactly which function is ...

22 мая 2020 г. · dyn corresponds to "interface reference", so it implies dynamic polymorphism (thus requires a bunch of jumps over references, so it's a bit slower).

11 мар. 2021 г. · Using dyn with types results in dynamic dispatch (hence the dyn keyword), whereas using a (constrained) generic parameter results in monomorphism.

18 июн. 2024 г. · A trait object, essentially, is a type-erased version of some type implementing the trait. But it can contain any type; and that type might have a lifetime.

19 дек. 2014 г. · Given a trait Foo , I'm pretty sure that Box<Foo> / Box<dyn Foo> is a trait object. Is &Foo / &dyn Foo also a trait object? What about other ...

9 авг. 2010 г. · They're hugely different. If you use dynamic you're opting into dynamic typing, and thus opting out of compile-time checking for the most part.

27 июл. 2018 г. · Error is a trait and you want to return a trait object (note the dyn keyword), so you need to implement this trait:

20 мая 2023 г. · I am trying to cast &Vec<Box<dyn SomeTrait + Send + Sync>> to &Vec<Box<dyn SomeTrait + Sync>>. I tried simply reassining as suggested here as well as using as ...

10 янв. 2021 г. · To get a &dyn T from a Box<dyn T> , use &* : let c: &dyn MyTrait = &*b;. The * is used to deref the box into its contents ( dyn MyTrait ) ...

16 мар. 2019 г. · Box<T> is covariant in T, but dyn B is not a subtype of dyn A, so Box<dyn B> is not a subtype of Box<dyn A>. Simple as that. A supertrait relationship is not ...