protected Subsystem(World theWorld)
{
World = theWorld;
World.EntityManager.RegisterSubsystem(this);
ComponentMask = new BitSet();
RelevantEntities = new List<uint> ();
_entitiesToAdd = new List<uint>();
_entitiesToRemove = new List<uint>();
}
public EntityManager (World world)
{
World = world;
_entities = new Dictionary<uint, BitSet>();
_subsystems = new List<Subsystem>();
}