Trait AppState 

pub trait AppState:
    Any
    + Send
    + Sync
    + Debug
    + Downcast { }

Trait for application state managed by the Runtime.

Any type that is Send + Sync + Debug + 'static can serve as application state. The runtime stores at most one instance of each concrete type.

Example

#[derive(Debug, Default)]
struct TodoList {
    items: Vec<String>,
}
impl AppState for TodoList {}

// Register with the runtime:
runtime.add_app_state(Box::new(TodoList::default()))?;

Implementations

impl dyn AppState

pub fn is<__T: AppState>(&self) -> bool

Returns true if the trait object wraps an object of type __T.

pub fn downcast<__T: AppState>(self: Box<Self>) -> Result<Box<__T>, Box<Self>>

Returns a boxed object from a boxed trait object if the underlying object is of type __T. Returns the original boxed trait if it isn’t.

pub fn downcast_rc<__T: AppState>(self: Rc<Self>) -> Result<Rc<__T>, Rc<Self>>

Returns an Rc-ed object from an Rc-ed trait object if the underlying object is of type __T. Returns the original Rc-ed trait if it isn’t.

pub fn downcast_ref<__T: AppState>(&self) -> Option<&__T>

Returns a reference to the object within the trait object if it is of type __T, or None if it isn’t.

pub fn downcast_mut<__T: AppState>(&mut self) -> Option<&mut __T>

Returns a mutable reference to the object within the trait object if it is of type __T, or None if it isn’t.

Implementors

impl AppState for VideoStateMap

impl AppState for Clock