LÖVE

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function Map:destroyBody(obj)
	self.destroys[obj] = true
end

function Map:update(dt)
	for k,v in pairs(self.destroys) do
		self.destroys[k] = true
	end
	collides = {}
	self.world:update(dt)
	handlepersist()
	for k,v in pairs(self.destroys) do
		if v then
			k.shape:destroy()
			k.body:destroy()
			self.destroys[k] = nil
		end
	end
	for unit,v in pairs(self.units) do
		if unit.update then unit:update(dt) end
	end
end

function handlepersist()
	for k,v in ipairs(collides) do
		local a,b,c=unpack(v)
		if a and map.destroys[a] then map.destroys[a] = false end
		if b and map.destroys[b] then map.destroys[b] = false end
		if map.units[a] and map.units[b] then
			if a.persist then
				a:persist(b,c)
			end
			if b.persist then
				b:persist(a,c)
			end
		end
	end
end
-- Collision callback that got registered
function persist(a,b,coll)
	table.insert(collides,{a,b,coll})
end