Query:removed_entities

Returns all entities that stopped matching this query during the last call to ECS:update.

Entities stop matching a query when they despawn, or when they lose enough components to no longer have the complete set required by this query.

This method can return entities that were just despawned.

Usage

query:removed_entities()

Returns

Name	Type	Description
entities	table	A table where every key is an Entity.

Examples

local Poison = Class("Poison", crystal.Component);
local PoisonSystem = Class("PoisonSystem", crystal.System);

PoisonSystem.init = function(self)
  self.query = self:add_query({ "Poison" });
end

PoisonSystem.frame = function(self)
  for entity in pairs(self.query:removed_entities()) do
    print((tostring(entity)) .. " is no longer poisoned");
  end
end