From: david@...
Date: 2005-08-13T01:25:42+09:00
Subject: Re: Array redefinition problem

Cit�t Brian Schr�der <ruby.brian@gmail.com>:

> > It's a web script, so I never noticed this warning in a class below the
> > array redef:
> >  warning: redefining Object#initialize may cause infinite loop
> > 
> > I had a "begin" in there that was unmatched, and a rescue several
> > functions later -
> > which was causing some real strange things.
> > 
> > Anyway, now that I have put the begin in the same function as the rescue,
> > I no longer get the error. But I still can't redefine Array - now I get:
> > 
> > /var/www/ruby/core.rb:22:in `num_rows': undefined local variable or
> > method `length' for #<#<Module:0xb65fcfec>::Array:0xb65e2c78> (NameError)
> > 
> > The first lines of the program are:
> > class ::Array
> >   def num_rows
> >     return length <--- LINE 22
> >   end
> > end
> > 
> > a = Array.new
> > puts a.num_rows
> > 
> > -- so how do I access ::Array.length?
> 
> class Array
>   alias :num_rows :length 
> end
> 
> [1,2,3].num_rows #=> 3
> 
> -- 
> http://ruby.brian-schroeder.de/
> 
> Stringed instrument chords: http://chordlist.brian-schroeder.de/
> 
> 

Yup, alias does indeed seem to be a better solution here. There might be a
slight bug with namespaces of methods implemented in C or something. Try using
explicitly self.length, if only for academic purposes?

David Vallner