Macro define_event 

macro_rules! define_event {
    (
		$(#[$meta:meta])*
		$vis:vis struct $name:ident {}
	) => { ... };
    (
		$(#[$meta:meta])*
		$vis:vis struct $name:ident {
			$(
				$(#[$field_meta:meta])*
				$field_vis:vis $field:ident: $field_ty:ty
			),* $(,)?
		}
	) => { ... };
}

Defines an event struct with cheap O(1) cloning using Arc pattern.

This macro generates:

• A hidden Inner struct containing all fields
• A public wrapper struct with Arc
• Clone implementation that clones the Arc (cheap)
• Constructor and accessor methods for all fields
• Event trait implementation

Example

use reifydb_core::define_event;

define_event! {
    pub struct MyEvent {
	pub data: Vec<i32>,
	pub name: String,
    }
}

let event = MyEvent::new(vec![1, 2, 3], "test".to_string());
let clone = event.clone(); // O(1) operation, just increments Arc refcount
assert_eq!(event.data().len(), 3);
assert_eq!(event.name(), "test");