From: Vivek <krishna.vivek@...>
Date: 2005-12-22T18:07:52+09:00
Subject: Re: When are attr_reader type methods called?

Ok ..sorry for the wrong code.What I meant was do have a class
method.Thanks for the explanation ..so now I have this below (I learnt
the instance_eval from Ross' examples)

class X
  @ivar = 1
  def self.call_this
     puts "call this"
     @var = 1
  end
end
class A <X
  call_this
  def some_method(arg)
    puts arg
  end
end
puts X.instance_eval { @var}
puts X.instance_eval { @ivar}


So I execute the above program and call_this is called. So I guess
these methods which are called in a class but outside any function have
to be class methods and are called in a sequential order as they are
encountered by the interpreter.
This brings me to another question
I have  a statement like @var = 1 inside a class method 'call_this'
,but @var is an instance variable,so who come I dont get  an error?
Although when I try to print it out it gives 'nil' .Is this some thing
which ruby forgives ?

And second
I read the documentation of instance_eval at The practical programmer
site..which says.

instance_eval    obj.instance_eval(aString  [, file  [  line  ]  ] ) ->
anObject

But here and in Ross' examples we call it on a class ? Is the
documentation incorrect or am i missing something.

thanks again
vivek