Struct PromptLookupSeq 

pub struct PromptLookupSeq { /* private fields */ }

2026-10-02: One sequence’s prompt-lookup state: its index, its copy window, and the length of the copy now awaiting verification (0 when the pending drafts are the model drafter’s).

Implementations

impl PromptLookupSeq

pub fn new(cfg: &PromptLookupConfig) -> Self

2026-10-02: Fresh state. The window starts at WINDOW_START (or the ceiling, if lower), so an untested sequence’s first copies are short and a wrong one costs few verify rows.

pub fn propose(&mut self, history: &[u32], max_len: usize) -> Option<Vec<u32>>

2026-10-02: Proposes a copy of at most max_len tokens for history (prompt, generated tokens and the token about to be verified), and marks it in flight. None (and nothing in flight) when there is no match or max_len is 0. The caller bounds max_len, normally by window.

No copy is proposed while a miss backoff is cooling down (each call counts one round), or when the match spans fewer than min_match tokens.

pub fn propose_with( &mut self, history: &[u32], max_len: usize, shared: impl FnOnce(&[u32], usize) -> Option<Vec<u32>>, ) -> Option<Vec<u32>>

2026-10-04: propose, but when the sequence’s own history has no match, asks shared (the cross-request cache) for a copy of at most max_len tokens. The own history is asked first; the cooldown applies to both; a shared copy is settled like an own one.

pub fn in_flight_shared(&self) -> bool

2026-10-04: The in-flight copy came from the cross-request cache.

pub fn in_flight(&self) -> usize

2026-10-02: Length of the copy awaiting verification; 0 when none.

pub fn settle(&mut self, accepted: usize) -> usize

2026-10-02: Closes the in-flight copy: accepted of its tokens matched. Returns the copy’s length (0 when none was in flight, which changes nothing).

A copy that matched nothing starts (or doubles) a backoff of up to miss_backoff rounds; any accepted token clears it.

pub fn abandon(&mut self)

2026-10-02: Drops an in-flight copy without judging it (its drafts were discarded unverified).

pub fn window(&self) -> usize

2026-10-02: The current copy window.

Trait Implementations

impl Clone for PromptLookupSeq

fn clone(&self) -> PromptLookupSeq

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PromptLookupSeq

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

Formats the value using the given formatter.