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Re: Re: perlapp, die, and __DATA__

by integral (Hermit)
on Apr 25, 2003 at 06:44 UTC ( #253081=note: print w/replies, xml ) Need Help??


in reply to Re: perlapp, die, and __DATA__
in thread perlapp, die, and __DATA__

Perl passes by alias, so using @_ instead of @ARGV will not prevent worries about modifying the global @ARGV. Options are to make a lexical copy (my @args = @ARGV) or to localise (local @ARGV = @ARGV).

use strict; use warnings; print "1: @ARGV\n"; foo(@ARGV); print "3: @ARGV\n"; sub foo { print "2a: @_\n"; $_[0] = "foobar"; print "2b: @_\n"; }

(Note however that the elements are aliased indivualluy into @_ not the whole array, so if @ARGV is empty there will be no modification as you are then adding a new element to @_ instead of modifying an element in @ARGV through @_.)

--
integral, resident of freenode's #perl

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[james28909]: omg
[james28909]: im just finding out that july and august have 31 days?
[atcroft]: stevieb: Apparently it was contagious....
[atcroft]: james28909: Make both hands into fists, place them together (with thumbs concealed), and every knuckle is a month (starting with Jan.) has 31 days, every dip (between knuckles) does not....
[atcroft]: (And Feb. is the odd case, because it is 28, unless it is a year divisible by 4, or if it is divisible by both 100 and 400 (at which point it is 29).)
[james28909]: i know but scroll through your calendar on your computer.
[james28909]: i thiught you were going to say make both hands into a fist and puch yourself in the face
[atcroft]: .oO(Sorry, I probably should have said take two normal hands....)
[atcroft]: james28909: No, unless you are a politician, I wouldn't say that (and even if you are, I still probably wouldn't say that).
[james28909]: i mean how hard can it be? its just subtracting days lol

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