Moduleapecs-0.10.1Haskell2010

Apecs.Tags

1 class
1 value

Packageapecs-0.10.1
Exports3
LanguageHaskell2010
LicenceBSD-3-Clause
SourceTags.hs

familytype family WTag w

The type of tags for a world, e.g. WTag MyWorld = MyWorldTag. Standalone so that multiple HasTags w m instances share one equation.

classclass Monad m => HasTags w (m :: Type -> Type) where

HasTags w m means that world w has a tag system generated by makeTaggedComponents. Provides a way to query component tags for entities, dispatching on the world type w.

Methods

entityTags :: Entity -> SystemT w m [WTag w]

valuecountCombinations

:: (HasTags w m, Enum (WTag w), Ord (WTag w))
=> IntSet
Entity IDs to census
-> SystemT w m (Map (Set (WTag w)) Int)

Count entities grouped by their distinct component combination.

Takes the world's entity member set and uses entityTags from the HasTags class to query each entity's tags. Returns a map from tag sets to entity counts.