class inheritance and method overriding

gmarinov · August 2013

Really baffled with this one, @atilim, @ar2rsawseen

I have a:

a = Core.class(Sprite)
function a:init() 
  print ("init a")
end
 
b = Core.class(a)
function b:init()
  print("init b")
end
 
local aa = a.new()  -- should print "init a"
local bb = b.new()  -- should print "init b"?

produces:

init a
init a
init b

I expect the "local b=b.new()" line to only print "init b".
I'm seeing Gideros merge the two methods, so both a.init and b.init execute.
However, I see "init a" then "init b", e.g. the order makes overriding methods impossible.
I'd expect when overriding a method, to call the parent explicitly. (e.g. b:init() would call a:init() explicitly)

Can someone advise on:
1. why the implicit call to a:init()
2. when doing a b.new(), why is a:init() executed first?
3. is method overriding possible at all?

Mells · August 2013

Hi @gmarinov,

I expect the "local b=b.new()" line to only print "init b".

To do that, in Gideros you have to do (can't test right now but should work) :

a = Core.class(Sprite)
function a:init() 
 
end
 
function a:postInit()
     print ("init a")
end
 
b = Core.class(a)
function b:init()
  print("init b")
end
 
local aa = a.new()
local bb = b.new()

postInit() [more informations] is probably your answer.

gmarinov · August 2013

@Mells
this does work, thank you very much!
I've never seen postInit() in the documentation??

Mells · August 2013

@gmarinov
Glad it helped

I've never seen postInit() in the documentation??

I am not sure either... at that time a lot of things were happening/changing through the forums and it was the primary source of informations.

Probably @ar2rsawseen could give us a directly link to the documentation covering that aspect so the discussion can be the definitive source of informations on that topic.

ar2rsawseen · August 2013

But before that @ar2rsawseen needs to add this information to documentation, to share a link to it :-\"

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