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Re^5: RFC: Tutorial: use strict; now what!?

by tangent (Curate)
on Feb 09, 2012 at 16:52 UTC ( #952784=note: print w/ replies, xml ) Need Help??


in reply to Re^4: RFC: Tutorial: use strict; now what!?
in thread RFC: Tutorial: use strict; now what!?

Thanks for explaining, I didn't know you could do that. BTW when I run that I get "soft=, hard=23"


Comment on Re^5: RFC: Tutorial: use strict; now what!?
Re^6: RFC: Tutorial: use strict; now what!?
by educated_foo (Vicar) on Feb 09, 2012 at 17:10 UTC
    Are you running exactly that program? What version of Perl? This is what I get:
    $ cat foo2.pl $foo = 23; $soft = 'foo'; $hard = \$foo; print "soft=$$soft, hard=$$hard\n"; $ perl foo2.pl soft=23, hard=23 $ perl -v This is perl, v5.10.1 (*) built for i686-cygwin-thread-multi-64int
      I did change it slightly by adding my (couldn't help myself)
      user$ cat foo2.pl my $foo = 23; my $soft = 'foo'; # soft reference my $hard = \$foo; # hard reference print "soft=$$soft, hard=$$hard\n"; user$ perl foo2.pl soft=, hard=23 user$ perl -v This is perl 5, version 14, subversion 1 (v5.14.1) built for darwin-2level user$ cat foo3.pl $foo = 23; $soft = 'foo'; # soft reference $hard = \$foo; # hard reference print "soft=$$soft, hard=$$hard\n"; user$ perl foo3.pl soft=23, hard=23
      I think I've learnt something about 'my' too!
        That's your problem: my makes a variable lexical, and symbolic references only work with dynamic/global variables. BTW, this is also why mixing eval STRING with lexicals is problematic:
        foobar:perl/blead% perl -le '$y="print \$x"; $z=sub { my $x=23; $y}; e +val $z->()' foobar:perl/blead% perl -le '$y="print \$x"; $z=sub { $x=23; $y}; eval + $z->()' 23

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