Binds

The Binds trait defines how an actor’s handler ports are associated with the message types it can receive remotely.

pub trait Binds<A: Actor>: Referable {
    fn bind(ports: &HandlerPorts<A>);
}

Implementing Binds<A> allows the system to determine which messages can be routed to an actor instance of type A.

Code Generation

In most cases, you do not implement this trait manually. Instead, the #[export] macro generates the appropriate Binds<A> implementation by registering the actor’s supported message types.

For example:

#[hyperactor::spawnable]
#[hyperactor::export(ShoppingList)]
struct ShoppingListActor;

Expands to:

impl Binds<ShoppingListActor> for ShoppingListActor {
    fn bind(ports: &HandlerPorts<Self>) {
        ports.bind::<ShoppingList>();
    }
}

This ensures that the actor is correctly wired to handle messages of type ShoppingList when used in a remote messaging context.