Struct RetractableFirstValueF64Accumulator 

pub struct RetractableFirstValueF64Accumulator { /* private fields */ }

Retractable FIRST_VALUE accumulator for f64 values.

Uses f64::to_bits() / f64::from_bits() for lossless i64 storage. Uses BTreeMap<i64, Vec<i64>> (timestamp to value_bits) for O(log n) ops.

Implementations

impl RetractableFirstValueF64Accumulator

pub fn new() -> Self

Creates a new empty accumulator.

pub fn len(&self) -> usize

Returns the number of stored entries.

pub fn is_empty(&self) -> bool

Returns true if no entries are stored.

pub fn result_f64(&self) -> Option<f64>

Returns the result as f64.

Trait Implementations

impl Clone for RetractableFirstValueF64Accumulator

fn clone(&self) -> RetractableFirstValueF64Accumulator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RetractableFirstValueF64Accumulator

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

Formats the value using the given formatter.

impl Default for RetractableFirstValueF64Accumulator

fn default() -> RetractableFirstValueF64Accumulator

Returns the “default value” for a type.

impl RetractableAccumulator for RetractableFirstValueF64Accumulator

type Input = (i64, f64)

The input type for the aggregation.

type Output = Option<i64>

The output type produced by the aggregation.

fn add(&mut self, (timestamp, value): (i64, f64))

Adds a value to the accumulator.

fn retract(&mut self, (timestamp, value): &(i64, f64))

Retracts (un-applies) a value from 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).

fn supports_efficient_retraction(&self) -> bool

Returns true if this accumulator can efficiently retract.

fn reset(&mut self)

Resets the accumulator to its initial state.