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Re^4: Boolean counter?

by Anonymous Monk
on Dec 07, 2009 at 16:15 UTC ( #811533=note: print w/replies, xml ) Need Help??


in reply to Re^3: Boolean counter?
in thread Boolean counter?

$i appears only once, the behaviour is defined
$ perl -MO=Deparse,-p -le"print - --$i" BEGIN { $/ = "\n"; $\ = "\n"; } print((-(--$i))); -e syntax OK
You were thinking of
print(-( ++$i - --$i ))

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Re^5: Boolean counter?
by ikegami (Pope) on Dec 07, 2009 at 17:01 UTC

    While the operand evaluation order for the ops you've used in your example isn't defined, it doesn't matter (unless there's an overflow) for that example. It's just a clarity issue.

    $i appears only once, the behaviour is defined

    Except it ($Counter) appeared twice.

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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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