Struct Backends 

pub struct Backends { /* private fields */ }

Container of engine backends — concrete impls of abstract traits.

API mirrors the legacy ServiceRegistry (drop-in replacement).

Implementations

impl Backends

pub fn new() -> Backends

Creates an empty container.

pub fn with_parent(parent: Arc<Backends>) -> Backends

Creates a container that delegates lookups to parent when a key is absent locally.

pub fn insert<T>(&mut self, backend: T)

where T: Send + Sync + 'static,

Inserts a backend, keyed by T’s TypeId. Convention: T is the trait-object type (e.g. Arc<Mutex<Box<dyn PhysicsProvider>>>).

pub fn get<T>(&self) -> Option<&T>

where T: Send + Sync + 'static,

Returns a borrow of the registered backend, walking the parent chain.

pub fn require<T>(&self) -> &T

where T: Send + Sync + 'static,

Returns a borrow of the registered backend, panicking if absent. Use for backends mandatory at engine startup.

pub fn contains<T>(&self) -> bool

where T: Send + Sync + 'static,

Reports whether a backend of the given type is registered.

pub fn len(&self) -> usize

Number of backends registered locally.

pub fn is_empty(&self) -> bool

Whether no backends are registered locally.

Trait Implementations

impl Debug for Backends

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

Formats the value using the given formatter.

impl Default for Backends

fn default() -> Backends

Returns the “default value” for a type.