Struct SignedSum 

pub struct SignedSum { /* private fields */ }

Per-node positive / negative accumulators for one signed exposure.

Both accumulators are grow-only per node; the net exposure is sum(pos) - sum(neg). See the module-level docs for convergence and overflow semantics.

Implementations

impl SignedSum

pub fn new() -> Self

pub fn add(&mut self, node: &str, delta: i128)

Apply a signed delta attributed to node.

delta >= 0 adds to the node’s positive accumulator; delta < 0 adds its magnitude to the node’s negative accumulator. Accumulation is saturating — a node’s accumulator never wraps and never decreases.

pub fn value(&self) -> i128

Net signed exposure: sum(pos) - sum(neg), computed with saturating arithmetic (saturates at i128::MAX / i128::MIN).

Trait Implementations

impl Clone for SignedSum

fn clone(&self) -> SignedSum

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CrdtMerge for SignedSum

fn merge(&mut self, other: &Self)

impl Debug for SignedSum

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

Formats the value using the given formatter.

impl Default for SignedSum

fn default() -> SignedSum

Returns the “default value” for a type.

impl DeltaCrdt for SignedSum

type Delta = SignedSumDelta

Per-CRDT delta type — typically Self for small CRDTs, a sub-state for set / map shapes.

fn take_delta(&mut self) -> Option<Self::Delta>

Take and clear the accumulated local delta. Returns None if no local change has happened since the last call.

fn merge_delta(&mut self, delta: &Self::Delta)

Merge an incoming delta into local state.

impl<'de> Deserialize<'de> for SignedSum

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for SignedSum

fn eq(&self, other: &SignedSum) -> 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 Serialize for SignedSum

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for SignedSum

impl StructuralPartialEq for SignedSum