Re: Accessing in a child class the attribute of a parent class

[Luciano de Souza <luchyanus@...>]

Unforgivable! It's difficult to explain how could I forget it!

The line 08 should be replaced from "class.child()", a simple class, to 
"class.child(parent)", subclass inheriting attributes and methods of 
"parent".

But, despite this mistake, the problem related in the previous message 
is still occuring with the same exact diagnosis!

On 05-01-2011 21:23, Norbert Kiesel wrote:

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')
> 02
> 03 class.parent()
> 04 function parent:__init()
> 05 self.a = 15
> 06 end
> 07
> 08 class.child()
> 09 function child:__init()
> 10 self.b = 22
> 11 end
> 12
> 13 function child:display()
> 14 print(parent.a)
> 15 print(self.b)
> 16 end
> 17
> 18 x = child()
> 19 x:display()
>    
Barring any black magic in classlib: where is defined that child is a
subclass of parent?