Struct SequenceSlot 

pub struct SequenceSlot {
    pub state: Box<dyn SequenceState>,
    pub position: usize,
    pub request_id: u64,
}

A live sequence slot in the SsmStatePool.

Each slot carries:

• state: the arch-specific SequenceState (SSM hidden state or an attention position counter wrapped by the arch crate).
• position: current token position in the sequence (mirrors state.step_position(), but accessible without a vtable call).
• request_id: the logical request ID associated with this slot (matches Sequence::id); 0 = unassigned.

Fields

state: Box<dyn SequenceState>

Arch-specific sequence state (SSM hidden vectors, or attention counter).

position: usize

Current token position (0-indexed).

request_id: u64

Request ID bound to this slot (0 = none).

Implementations

impl SequenceSlot

pub fn new(state: Box<dyn SequenceState>) -> Self

Create a new slot with the given state and a zero request ID.

pub fn step(&mut self)

Advance the internal position counter by one (after each forward step).

Also calls state.advance() so both the slot’s cached position and the underlying trait object stay in sync.

pub fn reset(&mut self)

Reset the slot to position 0 and clear the state.

The slot’s request_id is reset to 0 as well so that stale IDs are not accidentally read after re-allocation.