Struct Slot 

pub struct Slot<'s> { /* private fields */ }

A carved component-pool slot: slot_bytes of 8-aligned storage for one type-erased TypedSlot<C>.

The slot outlives every closure that dispatches through it because the BACKING is 'static — which is the point of W5, and why the Arc<ComponentCell> refcount that currently proves that lifetime becomes unnecessary.

Implementations

impl Slot<'_>

pub fn capacity(&self) -> usize

Bytes available for the erased slot value.

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

Whether T fits this slot, in both size and alignment.

A false here is a REGISTRATION error, not a compile error: the pool is heterogeneous and the FFI seam cannot name a generic. Callers surface it as “raise NROS_RUNTIME_COMPONENT_SLOT_BYTES”.

pub fn as_mut_ptr(&mut self) -> *mut u8

Pointer to the slot’s storage, for an in-place write of TypedSlot<C>.