On Apr 6, 8:36 pm, "Phil Bewig" <pbe...@xxxxxxxxx
> I like comprehensions, too. Here are my versions of list-of and fold-of:
There is some cut & paste error here, but don't worry ;)
No, actually what I really like is the documentation, since I
> Thank you for "really really" liking it. Have you used streams "in anger"
> in a real program?
finally understood what streams were ;) Until a few months ago,
I was missing the memoization requirement and I had the false
impression they were just another name for iterators. Instead,
they are quite different since they can use a potentially infinite
amount of memory (and the memory requirements are not known up front).
I quite liked the "pitfalls" section too.
Ah, I see, the documentation spells it out loud, but still I somewhat
> There is nothing wrong with port->stream. If you open a port, then pass it
> to port->stream, all will be fine; in fact, that's exactly what file->stream
> does. The problem is with with-input-from-file, which is eager.
managed to miss the point.
Ok. BTW, reading the R6RS document I do not understand what happens
> I did not include file->stream in the SRFI directly
> out of a sense of minimalism; likewise, there is no file->stream-lines.
> There is no error-handling in port->stream or file->stream because there is
> no error-handling in R5RS, and there was no R6RS implementation available at
> the time I wrote the SRFI.
with call-with-input-file or with-input-from-file when an exception
happens: is the port automatically closed, is it closed only
in some case (which cases?), is the behavior unspecified?
This has nothing to do with streams, so everybody here is
free to answer ;)
Well, stream-length is only meaningful for finite streams,
> Stream-equal? is only defined on finite streams; it has no meaning on
> infinite streams. And as the SRFI suggests, if you are materializing all
> the elements of a finite stream, you may as well be using a list.
still it is in the library. Also, converting two streams in lists
is fine if they are expected to be equal most of the times,
but if they are espected to be different it is inefficient.
Anyway, I do understand the point of not putting everything
in a library, so let's say it is fine as it is.