47 lines
1.0 KiB
OCaml
47 lines
1.0 KiB
OCaml
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class virtual ['subject, 'event] observer =
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object
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method virtual notify : 'subject -> 'event -> unit
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end
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class ['event] subject =
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object (self : 'subject)
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val mutable observers = ([]: (('subject, 'event) observer) list)
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method add_observer obs = observers <- (obs :: observers)
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method notify_observers (e : 'event) =
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List.iter (fun x -> x#notify self e) observers
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end
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type id = int
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class entity (id : id) =
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object
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val ent_destroy_subject = new subject
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method destroy_subject : (id) subject = ent_destroy_subject
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method entity_id = id
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end
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class ['entity] entity_container =
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object (self)
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inherit ['entity, id] observer as observer
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method add_entity (e : 'entity) =
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e#destroy_subject#add_observer (self)
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method notify _ id = ()
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end
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let f (x : entity entity_container) = ()
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(*
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class world =
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object
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val entity_container : entity entity_container = new entity_container
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method add_entity (s : entity) =
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entity_container#add_entity (s :> entity)
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end
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*)
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