Entity's Keys

You can now give the 'key' component to Entities.

A key will be generated automatically and stored in Entity.key.value.

You can then use this key to fetch the Entity from the World with World:getEntityByKey(key)

The keys are generated with a generator function that can be overriden.

concord/system.lua

@@ -48,6 +48,8 @@ System.mt = {
 -- @param table filters A table containing filters (name = {components...})
 -- @treturn System A new SystemClass
 function System.new(definition)
+   definition = definition or {}
+
    for name, def in pairs(definition) do
       if type(name) ~= 'string' then
          Utils.error(2, "invalid name for filter (string key expected, got %s)", type(name))