Struct KeyedDiff 

pub struct KeyedDiff { /* private fields */ }

Diff state of a point-keyed display: key -> slot id, free ids, capacity.

Implementations

impl KeyedDiff

pub fn new() -> Self

Empty state (nothing shown).

pub fn seq(&self) -> u64

Sequence number of the last committed delta (0 before the first).

pub fn capacity(&self) -> u32

Max slot id + 1 used so far (including ids taken by an uncommitted PendingDelta).

pub fn len(&self) -> usize

Points shown after the last commit.

pub fn is_empty(&self) -> bool

Whether nothing is shown.

pub fn apply( &mut self, cloud: &PointCloud, zones: &[usize], ) -> Result<DisplayDelta, String>

Diffs cloud (the whole display; unique keys required, zones[i] = owner zone of point i) against the shown state and commits. Non-finite points are skipped. Errors (no keys, wrong zones length) leave the state untouched.

pub fn unchanged(&mut self) -> DisplayDelta

A delta that changes nothing (the display is as before); still consumes a sequence number.

pub fn prepare( &mut self, cloud: &PointCloud, zones: &[usize], ) -> Result<PendingDelta, String>

First half of apply: classifies and assigns ids, without changing what counts as shown. Exactly one of commit / abort must follow before the next prepare.

pub fn commit(&mut self, p: PendingDelta) -> DisplayDelta

Makes a prepared delta the shown state and returns it.

pub fn abort(&mut self, p: PendingDelta)

Gives back a prepared delta (its ids return to the free list); the shown state is as before the prepare.

Trait Implementations

impl Default for KeyedDiff

fn default() -> Self

Returns the “default value” for a type.