From: Mike Gold <mike.gold.4433@...>
Date: 2009-02-11T10:02:59+09:00
Subject: Re: calling class method from instance ..

Larz wrote:
> 
>  def itest
>   puts @i
> # here's what I was trying to do !!!
>   puts self.class.ctest
>  end

I think Object#class is something to be avoided in most cases.  Frankly 
it's none of your business what class was used to create an object.  It 
doesn't matter _how_ an object sprang into existence, what matters is 
how it quacks.

I want to replace an object with a delegate with no ill effects.  Or 
with a mock object, or with whatever.  But uses of Object#class defeat 
this.

I would be inclined to make shared data explicit either with a constant 
or a with a passed-in reference to the shared data, rather than implicit 
with Object#class.

class Test
  SHARED = Struct.new(:ctest).new(2)

  def itest
    puts SHARED.ctest
  end
end

Test.new.itest  #=> 2
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