Attribute Macro entrait::entrait_dyn_impl

#[entrait_dyn_impl]

(Deprecated) Syntax sugar for implementing dynamic-dispatch inverted dependencies.

Note: This macro is deprecated. Use #[entrait(dyn)] impl TraitImpl for Type {} syntax instead.

The syntax is the same as for entrait_impl.

The only difference is that this version of the macro must be used when the trait delegation happens via dynamic dispatch (delegate_by = Borrow):

#[entrait(TraitImpl, delegate_by = Borrow)]
pub trait Trait {
    fn foo(&self) -> i32;
}

#[entrait_dyn_impl]
mod my_dynamic_impl {
    pub fn foo(_deps: &impl std::any::Any) -> i32 {
        42
    }

    #[derive_impl(super::TraitImpl)]
    pub struct MyDynamicImpl;
}

struct App(my_dynamic_impl::MyDynamicImpl);

impl std::borrow::Borrow<dyn TraitImpl<Self>> for App {
    fn borrow(&self) -> &dyn TraitImpl<Self> {
        &self.0
    }
}

fn test() {
    assert_eq!(42, Impl::new(App(my_dynamic_impl::MyDynamicImpl)).foo());
}
} // demo