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Re: [Gnu-arch-users] Features command for arch
From: |
Tom Lord |
Subject: |
Re: [Gnu-arch-users] Features command for arch |
Date: |
Thu, 2 Sep 2004 11:12:01 -0700 (PDT) |
> From: David Allouche <address@hidden>
> The proposal I have in mind (after discussion with Robert Collins) is
> slightly more elaborate.
> * Features are static and describe only the compile-time state of
> tla.
> * The "feature mapping" F maps "feature names" N (strings) to
> "feature versions" V (nonnegative integers).
> * F(N):V+1 implies F(N):V.
> This feature mapping F:string->integer can be transformed into a mapping
> F:string->boolean. In the unlikely event you have a problem with the
> math, please ask.
:-)
David is slying suggesting that for every feature mapping F and every
integer n we can define a mapping F_n whee
F_n(name) := (n <= F(name))
To say that is to make an assertion about the natural "topology" of
feature assertions.
David: why this particular topology and not one with richer structure?
(or poorer structure, as Jblack suggested?) Is there a "natural"
topology that might be the trump-card of topologies for feature
assertions? If there is no "natural" topology then this is a design
opportunity to accomidate conflicting constraints by making an
otherwise arbitrary decision in a context-specific way --- and so in
that case (of no "natural" topology): what is our design space?
(Likewise, re the math, we have a slightly foggy language barrier
between us, afaict.)
-t
- Re: [Gnu-arch-users] Features command for arch, (continued)
- Re: [Gnu-arch-users] Features command for arch, Adrian Irving-Beer, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, Tom Lord, 2004/09/02
- [Gnu-arch-users] Re: Features command for arch, Stefan Monnier, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, James Blackwell, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, tomas, 2004/09/03
- Re: [Gnu-arch-users] Features command for arch, James Blackwell, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, David Allouche, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch,
Tom Lord <=
- Re: [Gnu-arch-users] Features command for arch, David Allouche, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, Tom Lord, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, James Blackwell, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, Tom Lord, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, Jim Lynch, 2004/09/02
- Re: [Gnu-arch-users] Features command for arch, James Blackwell, 2004/09/02
Re: [Gnu-arch-users] Features command for arch, Robert Anderson, 2004/09/02
Re: [Gnu-arch-users] Features command for arch, Robert Anderson, 2004/09/02