Struct PnCounter 

pub struct PnCounter { /* private fields */ }

A state-based positive/negative counter with per-author components.

Implementations

impl PnCounter

pub const fn new() -> Self

Constructs a zero counter.

pub fn increment( &mut self, author: AuthorId, amount: u64, ) -> Result<(), CrdtError>

Adds to an author’s monotonic positive component.

pub fn decrement( &mut self, author: AuthorId, amount: u64, ) -> Result<(), CrdtError>

Adds to an author’s monotonic negative component.

pub fn value(&self) -> Result<i128, CrdtError>

Computes the signed counter value with overflow checking.

pub fn merge(&mut self, other: &Self) -> Result<(), CrdtError>

Deterministically combines another replica’s state.

pub fn canonicalize_for_commit( &self, author: AuthorId, _sequence: u64, _context: &VersionVector, _next_operation: &mut u32, ) -> Result<Self, CrdtError>

Attributes the visible signed value solely to the authenticated commit author.

Trait Implementations

impl Clone for PnCounter

fn clone(&self) -> PnCounter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PnCounter

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

Formats the value using the given formatter.

impl<'bytes, Ctx> Decode<'bytes, Ctx> for PnCounter

fn decode( __d777: &mut Decoder<'bytes>, __ctx777: &mut Ctx, ) -> Result<PnCounter, Error>

Decode a value using the given Decoder.

fn nil() -> Option<Self>

If possible, return a nil value of Self.

impl Default for PnCounter

fn default() -> PnCounter

Returns the “default value” for a type.

impl<Ctx> Encode<Ctx> for PnCounter

fn encode<__W777>( &self, __e777: &mut Encoder<__W777>, __ctx777: &mut Ctx, ) -> Result<(), Error<__W777::Error>>

where __W777: Write,

Encode a value of this type using the given Encoder.

fn is_nil(&self) -> bool

Is this value of Self a nil value?

impl FieldState for PnCounter

const CRDT_KIND: CrdtKind = CrdtKind::PnCounter

The deterministic merge strategy.

type Value = i128

The application value carried by this field strategy.

fn encode_state(&self) -> Result<Vec<u8>, RecordError>

Encodes complete causal field state.

fn decode_state(bytes: &[u8]) -> Result<Self, RecordError>

Strictly decodes complete causal field state.

fn visible_values(&self) -> Result<Vec<Vec<u8>>, RecordError>

Encodes each currently visible application value for filtering and indexes.

fn merge_state(&mut self, other: &Self) -> Result<(), RecordError>

Deterministically merges complete causal state from another replica.

fn canonicalize_for_commit( &self, author: AuthorId, sequence: u64, context: &VersionVector, next_operation: &mut u32, ) -> Result<Self, RecordError>

Reissues all causal identities from one authenticated commit envelope.

fn value_type_name() -> &'static str

Stable Rust logical value type used in schema compatibility checks.

impl Merge for PnCounter

fn merge(&mut self, other: &Self) -> Result<(), CrdtError>

Merges other into this value.

impl PartialEq for PnCounter

fn eq(&self, other: &PnCounter) -> 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 PnCounter

impl StructuralPartialEq for PnCounter