From: Michael Heerdegen <michael_heerdegen@web.de>
To: jwiegley@gmail.com
Cc: "Clément Pit--Claudel" <clement.pit@gmail.com>, emacs-devel@gnu.org
Subject: Re: [PATCH] Elpa: Pinpoint semantics of `seq-subseq' for streams
Date: Wed, 14 Sep 2016 17:15:22 +0200 [thread overview]
Message-ID: <87r38mwm0l.fsf@web.de> (raw)
In-Reply-To: <m2k2efl16x.fsf@newartisans.com> (John Wiegley's message of "Tue, 13 Sep 2016 18:28:22 -0700")
John Wiegley <jwiegley@gmail.com> writes:
> You could implement tail as a stream adapter that basically implements a
> sliding window:
>
> Whenever an element is requested from the tail stream, it keeps
> requesting elements from the parent stream, filling up its window
> buffer and cycling out old elements, until it reaches the end of the
> parent stream. At that point, it knows enough to start draining the
> window buffer to the caller.
Yeah, implementing it that way would be cool: if we use `stream-pop', we
would not even need to create a new stream, we would just return the
original stream `stream-pop'ped accordingly until we have found its end
- and everything wrapped inside `stream-delay' so that this is done not
before elements are requested from the returned stream.
Thanks,
Michael.
next prev parent reply other threads:[~2016-09-14 15:15 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-13 16:23 [PATCH] Elpa: Pinpoint semantics of `seq-subseq' for streams Michael Heerdegen
2016-09-13 18:02 ` Clément Pit--Claudel
2016-09-13 21:17 ` Michael Heerdegen
2016-09-14 1:24 ` Clément Pit--Claudel
2016-09-14 15:05 ` Michael Heerdegen
2016-09-14 23:26 ` Clément Pit--Claudel
2016-09-15 0:51 ` John Mastro
2016-09-15 2:00 ` Clément Pit--Claudel
2016-09-15 17:01 ` John Mastro
2016-09-15 21:07 ` Michael Heerdegen
2016-09-15 22:18 ` Clément Pit--Claudel
2016-09-15 22:28 ` Michael Heerdegen
2016-09-15 22:52 ` Clément Pit--Claudel
2016-09-15 0:58 ` Michael Heerdegen
2016-09-15 3:47 ` Clément Pit--Claudel
2016-09-15 8:42 ` Nicolas Petton
2016-09-15 22:30 ` Michael Heerdegen
2016-09-15 23:08 ` Nicolas Petton
2016-09-15 21:29 ` Michael Heerdegen
2016-09-14 1:28 ` John Wiegley
2016-09-14 15:15 ` Michael Heerdegen [this message]
2016-09-13 22:20 ` Nicolas Petton
2016-09-13 22:40 ` Michael Heerdegen
2016-09-14 8:25 ` Nicolas Petton
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