Struct Chain 

pub struct Chain<A, B>
where
    A: Indicator<Input = f64, Output = f64>,
    B: Indicator<Input = f64>,
{ /* private fields */ }

Chain two indicators so the output of the first becomes the input of the second.

Both indicators must agree on f64 as the bridging type, which is the common case for price-in/value-out indicators. The chain itself is an indicator, so chains can be nested arbitrarily.

Example

use wickra_core::{Chain, Ema, Indicator, Rsi};

// RSI(7) on top of EMA(14). EMA seeds at input 14, then RSI needs 7+1 more
// valid inputs to emit, so the chain becomes ready at input 21.
let mut chain = Chain::new(Ema::new(14).unwrap(), Rsi::new(7).unwrap());
for i in 1..=21 {
    chain.update(f64::from(i));
}
assert!(chain.is_ready());

Implementations

impl<A, B> Chain<A, B>

where A: Indicator<Input = f64, Output = f64>, B: Indicator<Input = f64>,

pub const fn new(first: A, second: B) -> Self

Construct a chain whose inputs flow through first and then second.

pub fn then<C>(self, third: C) -> Chain<Self, C>

where C: Indicator<Input = f64>, Self: Indicator<Input = f64, Output = f64>,

Add a third stage on top.

pub const fn first(&self) -> &A

Borrow the upstream indicator.

pub const fn second(&self) -> &B

Borrow the downstream indicator.

Trait Implementations

impl<A, B> Clone for Chain<A, B>

where A: Indicator<Input = f64, Output = f64> + Clone, B: Indicator<Input = f64> + Clone,

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<A, B> Debug for Chain<A, B>

where A: Indicator<Input = f64, Output = f64> + Debug, B: Indicator<Input = f64> + Debug,

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

Formats the value using the given formatter.

impl<A, B> Indicator for Chain<A, B>

where A: Indicator<Input = f64, Output = f64>, B: Indicator<Input = f64>,

type Input = f64

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

type Output = <B as Indicator>::Output

Type of one output value.

fn update(&mut self, input: f64) -> Option<Self::Output>

Feed one new data point into the indicator and return the freshly computed output, or None if there is no value for this input.

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.

fn batch_nan_into(&mut self, inputs: &[Self::Input], out: &mut [f64])

where Self::Input: Copy, Self::Output: Into<f64>,

Run the indicator over inputs, writing one output per input into the caller-owned out buffer (NaN where update returns None). It exists for every indicator whose output converts to an f64; the batch pipelines use it for the scalar f64 -> f64 ones.

fn batch_fast_into(&mut self, inputs: &[Self::Input], out: &mut [f64])

where Self::Input: Copy, Self::Output: Into<f64>,

Opt-in fast batch: like batch_nan_into, but an indicator with a vectorised kernel may reassociate its arithmetic to run it in SIMD lanes. Each value then agrees with the exact batch to within the tolerance the indicator documents (a few units in the last place), not bit for bit; warmup positions, NaN placement and the output length are identical. The kernels are deterministic: the same input produces the same bits on every platform, with or without SIMD hardware.