Struct Rule 

pub struct Rule {
    pub head: Atom,
    pub body: Vec<Atom>,
}

A Datalog rule: head :- body[0], body[1], ….

If body is empty, the rule is a fact (unconditional assertion).

Fields

head: Atom

The head atom (conclusion).

body: Vec<Atom>

The body atoms (premises), conjoined.

Implementations

impl Rule

pub fn new(head: Atom, body: Vec<Atom>) -> Self

Create a new rule.

pub fn is_fact(&self) -> bool

Returns true when the body is empty (the rule is an unconditional fact).

Trait Implementations

impl Clone for Rule

fn clone(&self) -> Rule

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Rule

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

Formats the value using the given formatter.