Struct datafrog::Iteration

pub struct Iteration { /* fields omitted */ }

An iterative context for recursive evaluation.

An Iteration tracks monotonic variables, and monitors their progress. It can inform the user if they have ceased changing, at which point the computation should be done.

Implementations

impl Iteration

pub fn new() -> Self

Create a new iterative context.

pub fn changed(&mut self) -> bool

Reports whether any of the monitored variables have changed since the most recent call.

pub fn variable<Tuple: Ord + 'static>(&mut self, name: &str) -> Variable<Tuple>

Creates a new named variable associated with the iterative context.

pub fn variable_indistinct<Tuple: Ord + 'static>(
    &mut self,
    name: &str
) -> Variable<Tuple>

Creates a new named variable associated with the iterative context.

This variable will not be maintained distinctly, and may advertise tuples as recent multiple times (perhaps unboundedly many times).