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Class system: Is there any instanceOf mechanism? — Gideros Forum
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    Class system: Is there any instanceOf mechanism?

    seppseppseppsepp Member
    edited October 2013 in General questions
    Hi @all,

    simple question as always ;) : In the Gideros class system is there any kind of an instanceOf mechanism? I could save class names or some other similar signature manually. But is this the way to go?

    Thanks in advance

    Sebastian
    Soledad - Charity Game | Birds and Trees
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    Comments

    • ar2rsawseenar2rsawseen Maintainer
      @seppsepp it could be like:
      local s = Sprite.new()
if getmetatable(s) == Sprite then
    -- s is instanceOf Sprite
end
      http://appcodingeasy.com/Gideros-Mobile
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    • seppseppseppsepp Member
      Unfortunately that doesn't work. Metatable is different to the instance =| .
      Soledad - Charity Game | Birds and Trees
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    • jdbcjdbc Member
      Accepted Answer
      Use a class property defined in the constructor:

      NewClass = Core.class(Sprite)

      function NewClass:init()
      ...
      self.class = 'NewClass'
      end
      JDBC Games on Google Play
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    • ar2rsawseenar2rsawseen Maintainer
      Accepted Answer
      yes you are right, it would work only for native classes.

      then probably setting id or name is the way to go
      http://appcodingeasy.com/Gideros-Mobile
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    • asakharovasakharov Member
      I have a base class for all game objects.
      One of his methods - GetType(), which throws an exception if not overridden by a subclass.
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    • helveticahelvetica Member
      @asakharov - how do you check if a function is not overridden, can you provide code sample?
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    • asakharovasakharov Member 
      GameBaseObject = Core.class(Sprite)
 
function GameBaseObject:init()
    ....
end
 
function GameBaseObject:getType()
    error("Undefind class type name. Please override it in appropriate game object.")
end
-----------------------
 
MyObject = Core.class(GameBaseObject)
function MyObject:init()
    ...
end
-----------------------
 
instance = MyObject.new()
print(instance:getTypeName()) <-- Exception with text "Undefind class type name. Please override it in appropriate game object."

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