Struct Occurrence

pub struct Occurrence<Var, TieBreaking> { /* private fields */ }

A VariableSelector which selects the variable with the largest number of attached constraints (where the provided num_occurrences stores the number of attached constraints per variable).

Implementations

impl<Var: Copy> Occurrence<Var, InOrderTieBreaker<Var, u32>>

pub fn new(variables: &[Var], num_occurrences: &[u32]) -> Self

Trait Implementations

impl<Var, TieBreaking> Debug for Occurrence<Var, TieBreaking>

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

Formats the value using the given formatter.

impl<TieBreaking> VariableSelector<DomainId> for Occurrence<DomainId, TieBreaking>

where TieBreaking: TieBreaker<DomainId, u32>,

fn select_variable( &mut self, context: &SelectionContext<'_>, ) -> Option<DomainId>

Determines which variable to select next if there are any left to branch on. Should only return None when all variables which have been passed to the VariableSelector have been assigned. Otherwise it should return the variable to branch on next.

fn on_conflict(&mut self)

A function which is called after a conflict has been found and processed but (currently) does not provide any additional information.

fn on_unassign_literal(&mut self, _literal: Literal)

A function which is called after a Literal is unassigned during backtracking (i.e. when it was fixed but is no longer), specifically, it provides literal which is the Literal which has been reset. This method could thus be called multiple times in a single backtracking operation by the solver.

fn on_unassign_integer(&mut self, _variable: DomainId, _value: i32)

A function which is called after a DomainId is unassigned during backtracking (i.e. when it was fixed but is no longer), specifically, it provides variable which is the DomainId which has been reset. This method could thus be called multiple times in a single backtracking operation by the solver.

fn on_appearance_in_conflict_literal(&mut self, _literal: Literal)

A function which is called when a Literal appears in a conflict during conflict analysis.

fn on_appearance_in_conflict_integer(&mut self, _variable: DomainId)

A function which is called when a variable appears in a conflict during conflict analysis.

fn is_restart_pointless(&mut self) -> bool

This method returns whether a restart is currently pointless for the VariableSelector.