Struct components_arena::ComponentClassToken

pub struct ComponentClassToken<C: ComponentClass> { /* fields omitted */ }

Component class static shared data.

In the no-no_std environment it can be stored inside static ComponentClassMutex:

macro_attr! {
    #[derive(Component!)]
    struct MyComponent { /* ... */ }
}

static MY_COMPONENT: ComponentClassMutex<MyComponent> = ComponentClassMutex::new();

// ...

let mut arena = Arena::new(&mut MY_COMPONENT.lock().unwrap());
let id = arena.insert(|id| (MyComponent { /* ... */ }, id));

In the no_std environment a custom solution should be used to store ComponentClassToken.

Implementations

impl<C: ComponentClass> ComponentClassToken<C>

pub fn new() -> Option<ComponentClassToken<C>>

Creates components shared data storage on first call for every component type C. All subsequent calls will return None.