From: nobu.nokada@...
Date: 2002-05-13T11:19:41+09:00
Subject: Re: stringIO extension?

Hi,

At Mon, 13 May 2002 07:04:10 +0900,
Thomas Sondergaard wrote:
> I would like to see the stringIO class be extended or rewritten, so it
> can be used to implement a streaming facility for arbitrary data
> sources/sinks. For input I'd basically like to see stringIO call
> underflow() when it reaches eof. The default underflow() would do
> nothing, but a subclass could overwrite it to "refill" the string and
> then use the string as a buffering space that is refilled in chunks.
>  
> Similarly I suggest that stringIO for output could be configured with a
> limit, at which point overflow() would be called. overflow() could then
> pass the data on to whatever data sink it desires.

I thought similar thing.

> Basically the scheme employed by streambuf in the Standard C++ Library.
>  
> How hard would it be to extend stringIO with these facilities?

There're still points to be discussed.  underflow()/overflow()
can change the entire buffer itself?  If so, how about
`offset'?

> PS! Actually I think it would make sense to implement some sort of
> AbstractIO and implement stringIO on top of that, instead of using
> stringIO directly as a facility for implementing other IO classes

Considerable.

To implement is easiest in programming but to design is
difficult.

-- 
Nobu Nakada