From: Stefano Crocco <stefano.crocco@...>
Date: 2013-02-18T06:34:00+09:00
Subject: Re: What is Ruby's default constructor?

On Monday 18 February 2013 Love U Ruby wrote
> Stefano Crocco wrote in post #1097453:
> > There was nothing "wrong" in your code before the 'begin'.
> > 
> > What happened is that you redefined Object.new not to return a new
> > object, but
> > to return whatever
> > 
> > p 'hi'
> > 
> > returned (that is, the string 'hi'). This obviously messes up
> > everything: IRB
> > tried to create an instance of a certain class (let's call it X) by
> > using
> > X.new, which is the same as Object.new. However, this didn't return an
> > instance of X, but a string. Then IRB tried to call the #set_backtrace
> > method
> > on the returned object (which should have been an instance of X but was
> > instead a string). Since a string doesn't have a set_backtrace method,
> > you get
> > the error.
> 
> As per your above explanation it seems and definitely an allocation to
> the memory has been made and only the reference has been lost. From my
> piece code - can it be possible to print also that memory address like
> "object_id" like the `p "hi" ` ?
> 
> Thanks.
> 
> --
> Posted via http://www.ruby-forum.com/.

Note that you rewrote Object.new to only print a message: it doesn't event 
allocate memory. If you want to see that, you need to something like:

def Object.new
  res = super
  p res.object_id
  res
end

Stefano