Struct LastValueAccumulator 

pub struct LastValueAccumulator { /* private fields */ }

Accumulator for LAST_VALUE aggregation.

Stores the value with the latest timestamp seen so far.

Trait Implementations

impl Accumulator for LastValueAccumulator

type Input = (i64, i64)

The input type for the aggregation.

type Output = Option<i64>

The output type produced by the aggregation.

fn add(&mut self, (value, timestamp): (i64, i64))

Adds a value to the accumulator.

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

Merges another accumulator into this one.

fn result(&self) -> Option<i64>

Extracts the final result from the accumulator.

fn is_empty(&self) -> bool

Returns true if the accumulator is empty (no values added).

impl Archive for LastValueAccumulator

where Option<i64>: Archive,

const COPY_OPTIMIZATION: CopyOptimization<Self>

An optimization flag that allows the bytes of this type to be copied directly to a writer instead of calling serialize.

type Archived = ArchivedLastValueAccumulator

The archived representation of this type.

type Resolver = LastValueAccumulatorResolver

The resolver for this type. It must contain all the additional information from serializing needed to make the archived type from the normal type.

fn resolve(&self, resolver: Self::Resolver, out: Place<Self::Archived>)

Creates the archived version of this value at the given position and writes it to the given output.

impl Clone for LastValueAccumulator

fn clone(&self) -> LastValueAccumulator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LastValueAccumulator

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

Formats the value using the given formatter.

impl Default for LastValueAccumulator

fn default() -> LastValueAccumulator

Returns the “default value” for a type.

impl<__D: Fallible + ?Sized> Deserialize<LastValueAccumulator, __D> for Archived<LastValueAccumulator>

where Option<i64>: Archive, <Option<i64> as Archive>::Archived: Deserialize<Option<i64>, __D>,

fn deserialize( &self, deserializer: &mut __D, ) -> Result<LastValueAccumulator, <__D as Fallible>::Error>

Deserializes using the given deserializer

impl PartialEq<ArchivedLastValueAccumulator> for LastValueAccumulator

where Option<i64>: Archive, <Option<i64> as Archive>::Archived: PartialEq<Option<i64>>,

fn eq(&self, other: &ArchivedLastValueAccumulator) -> 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 PartialEq<LastValueAccumulator> for ArchivedLastValueAccumulator

where Option<i64>: Archive, <Option<i64> as Archive>::Archived: PartialEq<Option<i64>>,

fn eq(&self, other: &LastValueAccumulator) -> 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<__S: Fallible + ?Sized> Serialize<__S> for LastValueAccumulator

where Option<i64>: Serialize<__S>,

fn serialize( &self, serializer: &mut __S, ) -> Result<<Self as Archive>::Resolver, <__S as Fallible>::Error>

Writes the dependencies for the object and returns a resolver that can create the archived type.