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Re: [PATCH] Elpa: Pinpoint semantics of `seq-subseq' for streams

From: Michael Heerdegen
Subject: Re: [PATCH] Elpa: Pinpoint semantics of `seq-subseq' for streams
Date: Wed, 14 Sep 2016 17:15:22 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

John Wiegley <address@hidden> 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.



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