Struct Decision 

pub struct Decision<E> {
    pub disposition: Disposition,
    pub effects: Vec<E>,
}

Outcome of Processor::decide_data / Processor::decide_system: a disposition for the input frame plus zero or more effects to emit.

Four forms

use pipecrab_core::{Decision, Disposition};

// 1. Pass-through: forward the input, emit nothing.
let d: Decision<u32> = Decision::forward();
assert_eq!(d.disposition, Disposition::Forward);
assert!(d.effects.is_empty());

// 2. Transform (drop-on-emit): consume the input, emit a replacement.
let d: Decision<u32> = Decision::drop().emit(42);
assert_eq!(d.disposition, Disposition::Drop);
assert_eq!(d.effects, [42]);

// 3. Observe-and-pass: forward the input *and* emit a derived value.
let d: Decision<u32> = Decision::forward().emit(42);
assert_eq!(d.disposition, Disposition::Forward);
assert_eq!(d.effects, [42]);

// 4. Silent drop: consume the input, emit nothing.
let d: Decision<u32> = Decision::drop();
assert_eq!(d.disposition, Disposition::Drop);
assert!(d.effects.is_empty());

Fields

disposition: Disposition

What happens to the input frame.

effects: Vec<E>

Effects to perform, in order, after the disposition is acted on.

Implementations

impl<E> Decision<E>

pub fn forward() -> Self

Forward the input, emit nothing. Allocates nothing.

pub fn drop() -> Self

Drop the input, emit nothing. Allocates nothing.

pub fn emit(self, effect: E) -> Self

Append an effect, leaving the disposition unchanged. Chainable.

Trait Implementations

impl<E: Clone> Clone for Decision<E>

fn clone(&self) -> Decision<E>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<E: Debug> Debug for Decision<E>

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

Formats the value using the given formatter.

impl<E> Default for Decision<E>

fn default() -> Self

Returns the “default value” for a type.

impl<E: Eq> Eq for Decision<E>

impl<E: PartialEq> PartialEq for Decision<E>

fn eq(&self, other: &Decision<E>) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<E: PartialEq> StructuralPartialEq for Decision<E>