Struct FieldVersions 

pub struct FieldVersions(pub Vec<u64>);

Per-field version numbers for state change tracking.

Each element corresponds to one state field, identified by the field’s declaration index (0-based). The Pregel scheduler uses version numbers to decide which nodes need to re-execute when subscribed fields change.

When #[derive(State)] generates the State implementation, it also generates a concrete FieldVersions type for the struct.

Tuple Fields

0: Vec<u64>

Implementations

impl FieldVersions

pub fn new(num_fields: usize) -> FieldVersions

Create a new FieldVersions with num_fields entries initialized to zero.

pub fn get(&self, field_idx: usize) -> u64

Get the version number for a specific field.

pub fn bump(&mut self, field_idx: usize)

Increment the version number for a specific field.

Trait Implementations

impl Clone for FieldVersions

fn clone(&self) -> FieldVersions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FieldVersions

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

Formats the value using the given formatter.

impl Default for FieldVersions

fn default() -> FieldVersions

Returns the “default value” for a type.

impl PartialEq for FieldVersions

fn eq(&self, other: &FieldVersions) -> 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 Eq for FieldVersions

impl StructuralPartialEq for FieldVersions