Struct Wad 

pub struct Wad { /* private fields */ }

Williams Accumulation/Distribution — a cumulative price-only line that adds the day’s accumulation on up-closes and subtracts the day’s distribution on down-closes.

if close > prev_close:  AD =  close − min(low,  prev_close)   (true low)
if close < prev_close:  AD =  close − max(high, prev_close)   (true high)
if close = prev_close:  AD =  0
WAD_t = WAD_{t−1} + AD

Larry Williams’ A/D line (distinct from Chaikin’s volume-based Adl) uses no volume at all — it measures accumulation as how far price closed above the true low on up-days and distribution as how far it closed below the true high on down-days, then accumulates the result. A rising WAD that diverges from a flat or falling price is the classic accumulation signal; a falling WAD under a rising price warns of distribution.

The line is unbounded and its absolute level is meaningless — only its slope and divergences against price matter. The first candle has no previous close, so it seeds the reference and emits nothing; thereafter every bar emits the running total. Each update is O(1).

Example

use wickra_core::{Candle, Indicator, Wad};

let mut indicator = Wad::new();
let mut last = None;
for i in 0..20 {
    let base = 100.0 + f64::from(i);
    let c = Candle::new(base, base + 1.0, base - 1.0, base + 0.5, 1_000.0, 0).unwrap();
    last = indicator.update(c);
}
assert!(last.is_some());

Implementations

impl Wad

pub fn new() -> Self

Construct a new Williams A/D line. The line is parameter-free.

pub const fn value(&self) -> Option<f64>

Current value if available.

Trait Implementations

impl Clone for Wad

fn clone(&self) -> Wad

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Wad

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

Formats the value using the given formatter.

impl Default for Wad

fn default() -> Wad

Returns the “default value” for a type.

impl Indicator for Wad

type Input = Candle

Type of one input data point (typically f64 for a price, or Candle / Tick).

type Output = f64

Type of one output value.

fn update(&mut self, candle: Candle) -> Option<f64>

Feed one new data point into the indicator and return the freshly computed output, or None if the indicator is still warming up.

fn reset(&mut self)

Reset all internal state, leaving the indicator equivalent to a freshly constructed instance with the same parameters.

fn warmup_period(&self) -> usize

Number of inputs required before the first non-None output can be produced.

fn is_ready(&self) -> bool

Whether the indicator has emitted at least one value since the last reset.

fn name(&self) -> &'static str

Stable, human-readable indicator name. Used by chaining and diagnostics.