From: Thien Vuong <tvuong@...>
Date: 2003-11-18T15:02:16+09:00
Subject: Re: Strong Typing (Re: Managing metadata about attribute types)



KUSUNOSE Toru wrote:
>>
> 
> 
> Sometimes, the latter is better.
> 

Definitely.  I could see much good use of it.
Just only wanted to point out that it is not always one way or another.

> For example, think Tempfile class.  An instance of Tempfile 
> class responds to every methods an instace of the File class has, 
> so surely its type is File.  But tmpfile.is_a? File is false.
> 

Thanks for pointing it out.  I wonder if I have some code needs to check
if it has a file behaviour or not (say the stream behavior plus about
10 differrent methods), how could I do it concisely?  I could structure
the application such that it is not necessary, but it is not always
possible nor desirable to do so.


>