Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!apple!apple.com!chewy
From: chewy@apple.com (Paul Snively)
Newsgroups: comp.lang.lisp
Subject: Re: "Pipes" in CL?
Message-ID: <5438@internal.Apple.COM>
Date: 27 Nov 89 23:12:14 GMT
References: <2898@trantor.harris-atd.com>
Sender: usenet@Apple.COM
Organization: Apple Computer, Inc.
Lines: 28

In article <2898@trantor.harris-atd.com> mac@trantor.harris-atd.com (Mike 
McDonald) writes:
>   Does anyone know how to create in Common Lisp
> the equivilant to a Unix pipe? I need to create 
> a stream that READ can use but I don't have all
> of the text when creating the stream, so things
> like MAKE-STRING-INPUT-STREAM won't do. I'm using 
> Allegro Common Lisp, so if anyone knows of an
> internal function, that would be fine.
> 
> 
>   Mike McDonald

I don't think that you gave quite enough information, Mike.  For example, 
using Allegro Common Lisp on the Macintosh, I can do what you ask quite 
easily, because streams are objects within the Object Lisp system, and all 
that I have to do to create a new kind of stream is subclass *STREAM* and 
provide a few methods, which can do their thing "lazily," if needs be.  
Other versions of Allegro Common Lisp may or may not support this (for 
example, I do not know whether any of the UNIX Allegros running Franz's 
Flavors allow this kind of stream definition or not).

__________________________________________________________________________
Just because I work for Apple Computer, Inc. doesn't mean that they 
believe what I believe or vice-versa.
__________________________________________________________________________
C++ -- The language in which only friends can access your private members.
__________________________________________________________________________