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- Subject: Re: Accessing in a child class the attribute of a parent class
- From: Norbert Kiesel <nkiesel@...>
- Date: Wed, 05 Jan 2011 15:23:43 -0800
On Wed, 2011-01-05 at 21:03 -0200, Luciano de Souza wrote:
> Hi all,
> I was trying to create a graphical interface using IUP with object
> oriented programming. Something wrong occurs. I prefer to simplify the
> example to ilustrate what is happining.
> In the original code, the class "parent" defines the window general
> behavior and the child class is a form inheriting methods and
> attributes. I prefer to simplify because the quantity of code.
> But the problem is the same: how to access in child class an attribute
> created in the parent?
> the result of 14th line is "nil", whereas I expected 15 as the answer. I
> tried self.a in the place of parent.a, but the result is still "nil". I
> tried to declare in the 5th line "parent.a", but the result is the same.
> 01 require('classlib')
> 03 class.parent()
> 04 function parent:__init()
> 05 self.a = 15
> 06 end
> 08 class.child()
> 09 function child:__init()
> 10 self.b = 22
> 11 end
> 13 function child:display()
> 14 print(parent.a)
> 15 print(self.b)
> 16 end
> 18 x = child()
> 19 x:display()
Barring any black magic in classlib: where is defined that child is a
subclass of parent?