Struct Slot

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

Allows writing into a struct field.

Implementations

impl<'s> Slot<'s>

pub fn for_ptr( ptr: NonNull<u8>, shape: ShapeDesc, init_mark: InitMark<'s>, ) -> Self

Create a new slot for writing into a struct field — not just foo.bar, but also foo.2 for tuples, foo.0 for newtype wrappers, etc.

pub fn fill<T: Shapely>(self, value: T)

Fills the slot with a value of a concrete type. This performs a type check and panics if the type is incompatible with the slot’s shape.

If the slot is already initialized, the old value is dropped.

pub fn fill_from_partial(self, partial: Partial<'_>)

Fill this slot from the given partial.

This is a code smell: if you have a slot, why are you filling it from a heap-allocated partial? That’s too many allocations.

pub fn shape(&self) -> ShapeDesc

Shape getter