Problem with drawing moving sprites.

[bartbes]

Ipairs is unsafe with either adding or removing, but next (and thus pairs) is safe when removing, but not adding. The relevant line from the manual:

The behavior of next is undefined if, during the traversal, you assign any value to a non-existent field in the table. You may however modify existing fields. In particular, you may clear existing fields.

[Moonkis]

Ipairs is unsafe with either adding or removing, but next (and thus pairs) is safe when removing, but not adding. The relevant line from the manual:

The behavior of next is undefined if, during the traversal, you assign any value to a non-existent field in the table. You may however modify existing fields. In particular, you may clear existing fields.

That is helpful!

Regarding updating objects the same frame they were added into the vector, how about this:

Code: Select all

	local max = #EntityManager.objects
	local index = 1
	while index <= max do
		local e = EntityManager.objects[index]
		e:update(dt)
		if not e:isAlive() then 
			table.remove(EntityManager.objects, index)
		else
			index = index + 1
		end
		max = #EntityManager.objects
	end

We can safely update (thus adding if an objects update calls the EntityManager.create method which adds the object into EntityManager.objects) and delete without skipping. Seeing as how it refreshes the max count of the table we iterate the added items as well.