From: Nathan Olberding <nathan.olberding@...>
Date: 2006-04-08T02:08:22+09:00
Subject: Re: Simple Question About Deleting Instances

zdennis wrote:
> Can you post code along with your questions ? It makes it so much easier
> to help.

class A
   @@a = 1
   @b = 2
   def say_stuff()
      puts @@a # Works
      puts @b  # Doesn't work
   end
end

> When using attr_reader, attr_writer, attr_accessor you dont need to
> include the @ symbols.
> 
> class A
>   attr_accessor :var # this will create an instance variable @var
>                      # plus the get/set methods for var on an instance
>                      # of A
> 
>   class << self
>      attr_accessor :foo # this will create a class method var for you
>                         # plus the get/set methods for var on the class
>                         # A. The var will be created as an instance
>                         #variable @var on the class A
>   end
> end
> 
> a  = A.new
> a.var = 5
> puts a.var #outputs 5
> 
> b = A.new
> b.var = 10
> puts  b.var #outputs 10
> 
> A.foo = 100
> puts A.foo  #outputs 100

That seems way more convoluted than just:

class A
   @@var = ""
   attr_accessor :@@var
end

Class << self creates class variables by the same name as instance 
variables? So you'd have both @@var and @var? Is there a specific reason 
for this? It seems HIGHLY unpredictable.

> Please do read the Chris Pines Learn To Program from my last post. It
> seems you are guessing at what goes where and you need little a
> guidance, Chris Pines Learn to Program will help you get started in the
> right direction.

I'll at least give it a glance at lunch time. Sounds promising. Thanks!

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