Struct Activation 

pub struct Activation<K = PolydatKernel> {
    pub index: u64,
    pub coords: Vec<(String, Value)>,
    pub kernel: K,
    pub cursor: Option<CursorSlice>,
}

One child scope of a traversal: the tuple it was activated for, a fresh kernel over the body’s program, and its cursor slice if the body declares a cursor. The kernel is the interpreter’s by default; TraversalStream::activation_on builds one on any engine behind the Kernel trait (engine parity, step 8).

Fields

index: u64

Position of this activation’s tuple in the traversal’s dispense order.

coords: Vec<(String, Value)>

The tuple, in element order.

kernel: K

A fresh kernel over the body’s shared program.

cursor: Option<CursorSlice>

The narrowest cursor slice, when the body declares a cursor.

Implementations

impl<K> Activation<K>

pub fn cycle_count(&self) -> u64

Cycles this activation runs under §3.4: the cursor slice length, or one when the body has no cursor.

pub fn coord(&self, name: &str) -> Option<&Value>

The value of one coordinate.

impl Activation<Box<dyn Kernel>>

pub fn cycle(&mut self, i: u64) -> &mut dyn Kernel

Position the kernel at cycle i and return it ready to pull, as the interpreter activation’s cycle does.

pub fn for_each_cycle(&mut self, f: impl FnMut(u64, &mut dyn Kernel))

Run f once per cycle, in order.

impl Activation

pub fn cycle(&mut self, i: u64) -> &mut PolydatKernel

Position the kernel at cycle i and return it ready to pull. The body’s cycle coordinate is the local index; the cursor’s ordinal slot receives the absolute ordinal.

pub fn for_each_cycle(&mut self, f: impl FnMut(u64, &mut PolydatKernel))

Run f once per cycle, in order.

Trait Implementations

impl Debug for Activation

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

Formats the value using the given formatter.

impl Debug for Activation<Box<dyn Kernel>>

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

Formats the value using the given formatter.