# declaring a simple generic

class HoldLastOne<of Type>
	# Last In, Only Out

	var _count	as int
	var _what	as Type?
	const _one as int = 1

	def add(what as Type)
		_what = what
		_count = 1
		assert _one == 1

	get pop as Type
		assert _count
		_count = 0
		return _what to Type  # .warning. just use

	get count as int
		return _count


class Test

	def main
		is shared

		i as int = 3
		assert i==3

		hi as HoldLastOne<of int> = HoldLastOne<of int>()
		assert hi.count==0
		hi.add(7)
		assert hi.count==1
		assert hi.pop==7
		assert hi.count==0

		hb as HoldLastOne<of bool> = HoldLastOne<of bool>()
		assert hb.count==0
		hb.add(false)
		hb.add(true)
		assert hb.count==1
		assert hb.pop
		assert hb.count==0