From: "Thomas Søndergaard" <tsondergaard@...>
Date: 2002-02-28T06:54:53+09:00
Subject: RE: RCR 65: IO orthogonalization, improved reusability

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> Has this discussion stalled?  Matz asked for a concrete proposal about
> a "Stream" API but none materialized.  I understand his request -- I
> am a bit fuzzy on what this RCR is actually requesting myself.

Yep, it has stalled. I posted the RCR because with rubyzip I'm faced =
with the challenge of creating an object that can be used in place of an =
instance of IO. Take any client-code that uses an IO instance. I'd like =
to be able to supply that client-code with an instance of, say, =
ZipInputStream, and it should just work. This is trivial with java.io =
streams and possible with C++ iostreams. It is *hard* with IO.

I feel that IO mixes a lot of stuff together, which is possibly nice for =
client-code, but terrible for implementers of IO "subclasses". =
Conesequently the RCR for breaking it into orthogonal parts, that can =
easily be specialized and reused. Implementing a new datasink should be =
a matter of implementing a very simple interface, e.g with two methods =
write(aString) and close. It should not be necessary to reimplement =
convenience methods such as puts, printf, etc. The same goes for data =
sources.

Cheers,

Thomas


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