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comp.lang.ruby

Re: a class that looks like (kind_of?) several classes

Eric Mahurin

5/10/2005 6:05:00 PM

> > The example I have above should probably be combining an IO
> and
> > a String since an IO accesses characters like a String:
> >
> > class IOString < IO
> > def kind_of?(c); String==c || super; end
> > # use IO methods (seek/tell/read/write) to accomplish
> > # the String methods
> > end
> >
> > This was just a toy example.
>
> There is a StringIO, you know.
>
> require 'stringio'

I was aware of that. This is making a string object look like
an IO. The above example was intended to make an IO class that
also looks like a String. Ideally, you would be able to do
something like match a regular expression against one of these
things (without having to read the whole file into memory), but
the regex code works on string data directly rather than use
method calls.

Actually, StringIO may be another example of what I'm talking
about. It doesn't need to inherit anything from the IO class
other than kind_of? and ancestors.




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