Struct AppState 

pub struct AppState { /* private fields */ }

Type-safe state container using TypeId as key.

Stores one value per type. Inserting a value of type T replaces any previous value of the same type.

Implementations

impl AppState

pub fn new() -> Self

Create an empty state container.

pub fn insert<T: Send + Sync + 'static>(&mut self, val: T)

Insert a value of type T. Replaces any previous value of the same type.

pub fn get<T: 'static>(&self) -> Option<&T>

Get an immutable reference to the value of type T.

pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T>

Get a mutable reference to the value of type T.

pub fn remove<T: 'static>(&mut self) -> Option<T>

Remove and return the value of type T.

pub fn contains<T: 'static>(&self) -> bool

Check if a value of type T is present.

pub fn len(&self) -> usize

Return the number of stored values.

pub fn is_empty(&self) -> bool

Return true if no values are stored.

pub fn clear(&mut self)

Clear all stored values.

Trait Implementations

impl Debug for AppState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for AppState

fn default() -> AppState

Returns the “default value” for a type.