Enum CaptureKind 

pub enum CaptureKind {
    Immutable,
    OwnedMutable,
    Shared,
}

Storage discipline for a closure capture.

Each capture index i has exactly one CaptureKind. The three kinds are mutually exclusive and map to three mutually-exclusive bitmasks on ClosureLayout (heap_capture_mask, owned_mutable_capture_mask, shared_capture_mask).

• Immutable — let by-move/copy captures. The slot’s width follows capture_types[i] via FieldKind; reads and writes go through super::closure_raw::read_capture_as_value_bits and super::closure_raw::write_capture_typed as today. If the underlying field kind is Ptr, the slot owns one heap-refcount share (participates in heap_capture_mask).
• OwnedMutable — let mut by-move captures. The 8-byte slot holds *mut ValueWord obtained from Box::into_raw(Box::new(...)). Exactly one closure owns the box; Drop reclaims it with Box::from_raw. The interior ValueWord can itself carry heap refcount shares — those must be dropped before the box is freed.
• Shared — var captures shared across nested closures. The 8-byte slot holds *const SharedCell obtained from Arc::into_raw(Arc::new(Mutex::new(...))). Each slot counts as one Arc strong share; reads/writes take the parking_lot mutex.

Variants

Immutable

let binding: value in slot, width per FieldKind.

OwnedMutable

let mut binding: Ptr slot holds *mut ValueWord (Box cell).

Shared

var binding: Ptr slot holds *const SharedCell (Arc<parking_lot::Mutex<ValueWord>> via Arc::into_raw).

Trait Implementations

impl Clone for CaptureKind

fn clone(&self) -> CaptureKind

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CaptureKind

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

Formats the value using the given formatter.

impl Hash for CaptureKind

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for CaptureKind

fn eq(&self, other: &CaptureKind) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for CaptureKind

impl Eq for CaptureKind

impl StructuralPartialEq for CaptureKind