@startuml
!include theme.ipuml
skinparam Linetype ortho
skinparam Nodesep 75
skinparam Ranksep 30

class ComponentManager <<irrelevant>>

package api {
	class Component <<irrelevant>>

	class Script {
		- Script()
		--
		# init() <<virtual>>
		# update() <<virtual>>
		--
		- parent : BehaviorScript *
	}

	class BehaviorScript {
		# BehaviorScript()
		+ ~BehaviorScript()
		--
		+ set_script<T>() : this &
		--
		# script : Script *
	}

	BehaviorScript -u-|> Component
	Script <.u. BehaviorScript : > friend
	Script ..u> BehaviorScript
}

class System <<irrelevant>>
class ScriptSystem <<Singleton>> {
	+ get_instance() : ScriptSystem & <<static>>
	+ update()
	--
	- ScriptSystem()
	- ~ScriptSystem()
}

System <|-- ScriptSystem
ScriptSystem .[norank]> ComponentManager

ScriptSystem .[norank]> api.Script : < friend
ScriptSystem .[norank]> api.BehaviorScript : < friend
ComponentManager .[norank]> api.BehaviorScript : < friend

@enduml