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Re: Re: (On Speed Diff, etc.) Closure on Closures (beta)

by yosefm (Friar)
on Jun 26, 2003 at 08:48 UTC ( #269154=note: print w/replies, xml ) Need Help??

in reply to Re: (On Speed Diff, etc.) Closure on Closures (beta)
in thread Closure on Closures

I've seen objects actually implemented with a closure (like in this tutorial), as a way to give your objects a 'private/public' distinction. I wonder what would that do to performance...
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Re: Re: Re: (On Speed Diff, etc.) Closure on Closures (beta)
by chunlou (Curate) on Jun 26, 2003 at 09:52 UTC
    Right, that's a very clever use of closure. Maybe I didn't read enough, but I don't see such technique being used too often. It's good for avoiding more deliberate tempering with variables in a package. Isn't the usual lexical scope good enough to avoid accidental clashes between things?

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[oiskuu]: Hm. that depends on kernel compiled with CONFIG_AUDITSYSCAL L
[tye]: apropos my several mentions of audit
[Corion]: At least my (non-SELinux) Debian has that config thing set. I don't have non-Debian machines handy (except Android)
[Corion]: My Android phone also has /proc/self/ loginuid, but that displays -1 (resp. 4GB). That might be because the phone is rooted.
[tye]: -1 means nobody logged in or the process was started before audit got booted
[davido]: ok, on my ubuntu system getlogin grabs from /proc/self/ loginuid (per strace)

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