[ruby-talk:00604] Re: A `File' is not a `IO'?????

On 10 Aug, Yukihiro Matsumoto wrote:
> Hi,
> 
> In message "[ruby-talk:00600] A `File' is not a `IO'?????"
>     on 99/08/10, [e-mail] <[e-mail]> writes:
> 
> |Within the method I have checked with `fileclass.is_a? IO' and got a
> |`false'?????
> 
> Why not?  File (the class object) is not an instance of the IO class,
> but an instance of the class named Class.  Maybe you misunderstood the
> meaning of `is_a?'.

Perhaps! :-) I was thinking, that both should be true:

	(1) A `File' is an `IO'
	(2) An instance of a `File' is therefore also an instance of a
	    `IO'. Short: An instance of `File' is_a `File' and an `IO'

> 
> `is_a?' is for the check whether the receiver is an instance of the
> argument class.

Okay!

> 
> |`File.ancestors.include? IO' very much. But that's me, perhaps... ;-)
> 
> Hmm, me neither.  Try `IO > File', which maybe a little bit better.

That's cool! :-)))

I have found it in the Module description right now :-( Perhaps it would
not be to unclever to mention it under `Class' too :-)

> 
>                                                         matz.

\cle

PS: I have tried your patches yesterday. Thanks for the fast response.
These patches are for Ruby 1.3.7, aren't they? I have tried to put them
into 1.3.6 and they have not worked very well :-}