Enum StorageClass 

pub enum StorageClass {
    Shared,
    SessionState,
    Transient,
}

How a node’s storage is shared and how long it lives — its storage class ([03-ir §“Storage classes and sessions”]). A node is a structural fact and does not need storage to exist; when storage is attached, its class governs sharing and lifetime so one optimized graph can serve many concurrent sessions (weights shared, session state SessionId-keyed, activations per-realize scratch).

The class is inferred from the op (infer_storage_class) with an explicit override recorded in the graph’s storage_class side-table — e.g. KV-cache placeholder Op::Consts, which are session state, not shared weights.

Phase D substrate (PR-D1): the classification is recorded but not yet consumed by realize. Session keying (D2) and the persistent decode graph (D3–D5) build on it.

Variants

Shared

Weights / constants: one storage for the whole model, identical across all sessions; keyed by NodeId. The op-inferred default for Op::Const.

SessionState

Per-session durable buffers (KV-caches + explicit cache-write targets): one storage per session, keyed by (NodeId, SessionId). The op-inferred default for the in-place cache-write ops (Op::WriteSlice / Op::WriteSliceRotating); KV-cache placeholder Op::Consts take it via an explicit override.

Transient

Activations / scratch: ephemeral, allocated per realize and freed after use; never persisted. The op-inferred default for everything else. A transient value may cross devices mid-realize (a D2D Op::Copy) but never crosses to disk.

Trait Implementations

impl Clone for StorageClass

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for StorageClass

impl Debug for StorageClass

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

Formats the value using the given formatter.

impl Eq for StorageClass

impl Hash for StorageClass

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 StorageClass

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for StorageClass