Problems with getClass

Comments

• tetnic Member

  October 2019 edited October 2019

  I have printed the entire metatable of an object and it is clear that the field

  __classname

  is set only for Gideros' classes. For example

  __classname= "Sprite"

  I'm creating a workaround function that returns a subclass and sets the field. Hope it will work.

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• hgy29 Maintainer

  October 2019

  Thanks for reporting,
  I can see why Gideros doesn't set it for lua classes, it is because it has no way of knowing how you named your class! That could be added as a third arg to Core.class maybe ? Second arg is already used for base class parameters.

  MyView = Core.class(Sprite,nil,"MyView")

  Likes: tetnic

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• tetnic Member

  October 2019 edited October 2019

  Hi @hgy29,
  
  Yes that is the solution I was trying to implement as a workaround

  function Core.class(super, subclass)   local cls = Core.class(super)   -- Set __classname on metatable   return cls   end

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• hgy29 Maintainer

  October 2019

  Thinking of it, it would be probably better to accept the class name as second argument (based on its type), and the base class constructor function as second or third arguments.

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• tetnic Member

  October 2019 edited October 2019

  In my function the "subclass" name is mandatory, only to force every class to have a __classname. But I think that having the choice could be the best solution.
  
  I have also searched for info about macros... but I cannot make it compile. Is it yet available the "macro" plugin? It seems that it can permit to create some interesting macros as the following:

  '<a href="https://forum.giderosmobile.com/profile/def" rel="nofollow">@def</a> Class(class, super) class = Core.class(super, nil, _STR_(class))

  '

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• hgy29 Maintainer

  October 2019

  macros are builtin gideros, so no plugin required, but I am not the right guy to explain how to use them (I don't).
  This can help you however: https://wiki.giderosmobile.com/index.php/Macro_Functions

  Likes: SinisterSoft

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• tetnic Member

  October 2019 edited October 2019

  Thank you, I already saw that, but is not useful because it seems to not supporting the stringify mechanism.
  
  I'm basing on this post, if it's valid yet: http://forum.giderosmobile.com/discussion/comment/48204/#Comment_48204
  
  But I'm not able to make it work.
  
  However I've already implemented my helper functions:

  function Core.subclass(super, args, subclass) Assertions.argNotNil(super, "super", Type.isClass(super)) Assertions.arg(args, "args", Type.isFunction(args)) Assertions.argNotNil(subclass, "subclass", Type.isString(subclass))   local cls = Core.class(super, args) Core.setClass(cls, subclass)   return cls end   function Core.setClass(value, class) Assertions.argNotNil(value, "value", Type.isTable(value)) Assertions.argNotNil(class, "class", Type.isString(class))   local mt = getmetatable(value) if not mt then error("Invalid superclass.") end mt["__classname"] = class end

  I have used my assertions classes inside them... If anyone will like I can share them on GitHub.
  
  Mauro

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