Derive Macro Events 

#[derive(Events)]

Derives the Events trait for an enum.

This macro automatically implements the Events trait along with Copy and Clone. Unlike States, this does not generate a Default implementation.

Requirements

• Can only be derived for enums
• All variants must be unit variants (no fields)

Generated Implementations

• Events - Maps variants to/from indices starting at 0
• Copy and Clone - Enables efficient copying

Examples

use tinystate::Events;

#[derive(Events)]
enum DoorEvent {
    Push,   // Index 0
    Pull,   // Index 1
    Lock,   // Index 2
    Unlock, // Index 3
}

let event = DoorEvent::Lock;
assert_eq!(event.index(), 2);

let reconstructed = DoorEvent::from_index(2);
assert_eq!(reconstructed.index(), event.index());

Panics

The derive macro will panic at compile time if:

• Applied to a struct or union (not an enum)
• Any variant has fields (only unit variants are allowed)

The generated from_index method will panic at runtime if called with an invalid index.