Module supply 

Supply infrastructure for variable relationship tracking.

Supplies provide efficient access to derived information about planning variables, such as inverse relationships (who points to whom) and anchor tracking (chain roots).

The supply pattern enables O(1) lookups that would otherwise require O(n) scans.

Architecture

• Supply: Marker trait for all supply types
• SupplyDemand: Request a specific supply type from the manager
• SupplyManager: Registry holding all active supplies
• ListVariableStateSupply: Centralized tracking for list variable shadow state

Structs

AnchorVariableDemand

Demand for an anchor variable supply.

DemandKey

A unique key identifying a supply demand.

ExternalizedAnchorVariableSupply

Hash-based implementation of anchor variable supply.

ExternalizedSingletonInverseVariableSupply

Hash-based implementation of inverse variable supply.

ListVariableStateDemand

Demand for a ListVariableStateSupply.

ListVariableStateSupply

Supply that tracks list variable element positions.

SingletonInverseVariableDemand

Demand for a singleton inverse variable supply.

SupplyManager

Manager that holds and provides supplies.

Enums

ElementPosition

Position of an element within a list variable.

Traits

AnchorVariableSupply

Supply that provides O(1) lookup of an entity’s chain anchor.

IndexVariableSupply

Trait for supplies that provide index information.

InverseVariableSupply

Trait for supplies that provide inverse (owner entity) information.

SingletonInverseVariableSupply

Supply that provides O(1) lookup of the entity pointing to a value.

Supply

Marker trait for all supply types.

SupplyDemand

Trait for requesting a specific type of supply.