Enum Topology 

pub enum Topology {
    Chain,
    Star,
    Fanout,
    Fanin,
}

The four canonical 2-body topologies scored by the engine.

Variants

Chain

H(X,Y) :- L(X,Z), R(Z,Y) — join on intermediate Z.

Star

H(X,Y) :- L(X,Y), R(X,Y) — shared X,Y.

Fanout

H(X,Y) :- L(X,Z), R(X,Y) — left introduces Z.

Fanin

H(X,Y) :- L(X,Y), R(Z,Y) — right introduces Z.

Implementations

impl Topology

pub const ALL: [Topology; 4]

All four topologies, in the scoring order used by the engine.

pub fn as_str(&self) -> &'static str

Stable string form exposed to pyxlog / Python.

Trait Implementations

impl Clone for Topology

fn clone(&self) -> Topology

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Topology

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

Formats the value using the given formatter.

impl Hash for Topology

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Topology

fn eq(&self, other: &Topology) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Topology

impl Eq for Topology

impl StructuralPartialEq for Topology