Struct PNCounterUpdate 

pub struct PNCounterUpdate { /* private fields */ }

State for an increment/decrement distributed counter (PNCounter CRDT).

Internally uses two GCounters: one for increments (P), one for decrements (N). The value is P - N. Each is merged independently via pointwise max.

Implementations

impl PNCounterUpdate

pub fn get(&self) -> i64

Counter value (sum of increments minus sum of decrements).

pub fn inc(rank: usize, delta: u64) -> Self

Create an increment update for a rank.

pub fn dec(rank: usize, delta: u64) -> Self

Create a decrement update for a rank.

pub fn num_inc_ranks(&self) -> usize

Number of ranks that have contributed increments.

pub fn num_dec_ranks(&self) -> usize

Number of ranks that have contributed decrements.

Trait Implementations

impl Clone for PNCounterUpdate

fn clone(&self) -> PNCounterUpdate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PNCounterUpdate

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

Formats the value using the given formatter.

impl Default for PNCounterUpdate

fn default() -> PNCounterUpdate

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for PNCounterUpdate

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JoinSemilattice for PNCounterUpdate

fn join(&self, other: &Self) -> Self

The join (least upper bound).

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

In-place variant.

fn join_all<I>(it: I) -> Option<Self>

where I: IntoIterator<Item = Self>,

Join a finite iterator of values. Returns None for empty iterators.

impl Named for PNCounterUpdate

fn typename() -> &'static str

The globally unique type name for the type. This should typically be the fully qualified Rust name of the type.

fn typehash() -> u64

A globally unique hash for this type. TODO: actually enforce perfect hashing

fn typeid() -> TypeId

The TypeId for this type. TypeIds are unique only within a binary, and should not be used for global identification.

fn port() -> u64

The globally unique port for this type. Typed ports are in the range of 1<<63..1<<64-1.

fn arm(&self) -> Option<&'static str>

If the named type is an enum, this returns the name of the arm of the value self.

unsafe fn arm_unchecked(self_: *const ()) -> Option<&'static str>

An unsafe version of ‘arm’, accepting a pointer to the value, for use in type-erased settings.

impl Serialize for PNCounterUpdate

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

where __S: Serializer,

Serialize this value into the given Serde serializer.