## SlotMap
type
  Slot*[T] = object
    slotMap: SlotMap
    index: int

  SlotMap*[T] = ref object
    perChunk: int
    chunks: seq[pointer]

proc newSlotMap*[T](perChunk: int): SlotMap[T] =
  new(result)
  result.chunks = @[]
  result.perChunk = perChunk

proc add*[T](slotMap: SlotMap[T], item: T): Slot[T] =
  Slot[T](slotMap: slotMap, index: 0) #TODO: allocate in chunk, return allocated index


## tests
when isMainModule:
  type
    Component = object


  var sm = newSlotMap[Component](128)
  echo $sm.perChunk

  var obj = sm.add(Component())
  echo $obj.index