Date: Tue, 10 Mar 1998 10:46:00 +0900 (JST) From: Michael Hancock <michaelh@cet.co.jp> To: Anatoly Vorobey <mellon@pobox.com> Cc: Nate Williams <nate@mt.sri.com>, current@FreeBSD.ORG Subject: Re: vnode_pager: *** WARNING *** stale FS code in system Message-ID: <Pine.SV4.3.95.980310103954.27993B-100000@parkplace.cet.co.jp> In-Reply-To: <19980309194602.38788@techunix.technion.ac.il>
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On Mon, 9 Mar 1998, Anatoly Vorobey wrote: > > > > Traditional OOP does this right, since you inherit from the class below > > > > you, and not from the base class. If you want to inherit from the base > > > > class, you inherit from it and not a subclass. > > > > > > But do you get the mappings from layer1 and layer3? They both touch the > > > results that finally get to the top. > > > > If you want them to, then yes. > > So, does the stacking layer support multiple inheritance? :) Sort of. It's called fan-out, where you have a single layer stacked across multiple lower layers. e.g. a vfs-based mirroring implementation or unionfs. Unionfs is pretty cool, your lower layer could be your cd and the upper layer could be a directory in an ffs system. You can compile over your cdrom as if it were writable. There's also fan-in where multiple layers are stacked horizontally across a single lower layer. Mike Hancock To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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