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%+ and scope

by oha (Friar)
on Jan 04, 2013 at 10:10 UTC ( #1011596=perlquestion: print w/replies, xml ) Need Help??
oha has asked for the wisdom of the Perl Monks concerning the following question:

Hi,

I found a strange behavior while trying to return values from %+:

perl -E 'sub foo { local $_ = shift; m{(?<a>\d++)}; say "IN ", @+{qw(a +)}; return @+{qw(a)} } say "OUT ",foo("12.34.56");' IN 12 OUT

I was expecting to get the same result, but apparently the list become empty when exiting the scope.

adding a map (return map { $_ } @+{qw(a)}) fix the issue, and it does not show by just returning $+{a}.

Am i missing something or there's something wrong?

TIA

update: see 976633

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Re: %+ and scope
by Anonymous Monk on Jan 04, 2013 at 10:14 UTC

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[davido]: I am not finding closing STDIN to be an adequate means of making getlogin return undef.
[Corion]: Maybe doing a double-fork (daemonizing) can make go that information away, but maybe not
[Corion]: But I think my knowledge of unix/Linux datastructures is several decades out of date, so I don't really know what information it keeps on processes
[oiskuu]: The useful bits that relate to your process can be found under /proc/self. What information are you thinking of? Tty name?
[tye]: I just daemonized and getlogin() still knew who I had been.
[tye]: perhaps loginuid ? Not that I concede that something not being in /proc means it is not useful.

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