From: Lionel Thiry <lthiryidontwantspam@...>
Date: 2005-03-15T23:00:07+09:00
Subject: Re: [newby] class variables and class instance variable?

Hello again!

I've refactored a bit the code of Wolfgang. Now, it do a lot of reuse through 
inheretance. I'm really curious to know what this refactored code would give 
under ruby 1.9.0. Would you mind to test it for me, please?

Here it is:

class Animal
  @@born = 0
  def initialize
   @@born += 1
   self.class.anew
  end
  def self.anew
    puts "a new animal"
  end
  def self.born
   @@born
  end
end

class Dog<Animal
  def self.anew
    puts "a new dog"
  end
end

class Cat<Animal
  def self.anew
    puts "a new cat"
  end
end

print "#{Cat.born} cats, #{Dog.born} dogs, #{Animal.born} animals\n"
2.times{Dog.new}
print "#{Cat.born} cats, #{Dog.born} dogs, #{Animal.born} animals\n"
3.times{Cat.new}
print "#{Cat.born} cats, #{Dog.born} dogs, #{Animal.born} animals\n"

It still gives the same output:
0 cats, 0 dogs, 0 animals

a new dog

a new dog

2 cats, 2 dogs, 2 animals

a new cat

a new cat

a new cat

5 cats, 5 dogs, 5 animals


Thanks in advance,
Lionel Thiry

ts wrote:
>>>>>>"W" == Wolfgang N�dasi-Donner <wonado@donnerweb.de> writes:
> 
> 
>>>>>Output >>>
> 
> W> 0 cats, 0 dogs, 0 animals
> W> a new dog
> W> a new dog
> W> 2 cats, 2 dogs, 2 animals
> W> a new cat
> W> a new cat
> W> a new cat
> W> 5 cats, 5 dogs, 5 animals
> 
>>>>>End of Example >>>
> 
> 
>  With this version of ruby
> 
> uln% ruby -v
> ruby 1.9.0 (2005-03-14) [x86_64-linux]
> uln% 
> 
>  The result is
> 
> 0 cats, 0 dogs, 0 animals
> a new dog
> a new dog
> 0 cats, 2 dogs, 0 animals
> a new cat
> a new cat
> a new cat
> 3 cats, 2 dogs, 0 animals
> 
>