Struct ComponentsView 

pub struct ComponentsView<'a> {
    pub instances: Option<&'a [Option<Box<dyn ErasedComponent>>]>,
    pub slots: Option<&'a HashMap<String, ComponentRef>>,
}

Read-only view onto sibling components registered on the Node. Constructed by the engine at dispatch time from &engine.components + &engine.slots. The Vec is indexed by ComponentRef.as_u32() as usize; the slot the currently- dispatching component lives in is None for the duration of the dispatch (take-and-restore in invoke_atomic), so callers can’t accidentally re-enter themselves.

Fields

instances: Option<&'a [Option<Box<dyn ErasedComponent>>]>

All registered components indexed by ComponentRef.as_u32(), borrowed from engine.components. None outside engine context (test setups bypassing the registry).

slots: Option<&'a HashMap<String, ComponentRef>>

Author-chosen-slot-name → ComponentRef map, borrowed from engine.slots. THE canonical dependency-resolution surface. None outside engine context.

Implementations

impl ComponentsView<'_>

pub fn for_slot( &self, slot_name: &str, ) -> Option<&(dyn ErasedComponent + 'static)>

Look up the component bound at slot_name. The generic dependency-resolution surface — Components reach their declared dependencies through this accessor. Returns None when no slot of that name is bound or when the view has no engine context.

pub fn for_slot_as<T>(&self, slot_name: &str) -> Option<&T>

where T: 'static,

Look up the component bound at slot_name AND downcast it to &T. The typed counterpart to Self::for_slot. Returns None when the slot is unbound OR when the bound concrete is not a T.

In production this is reached through crate::runtime::RuntimeResourceRef::dependency, which wraps the lookup in DependencyError variants for typed error reporting.

Trait Implementations

impl<'a> Default for ComponentsView<'a>

fn default() -> ComponentsView<'a>

Returns the “default value” for a type.