Re: search position is getting reset after 'local'

I think this should clear things up a bit (from perlsub):

A "local" just gives temporary values to global (meaning package) variables. It does not create a local variable.

I read that as meaning it works like this:

print "$x, ", pos($x), "\n";
{ 
  $tmp_1 = $x;
  $x = undef;
  $x = $tmp_1;   # assign "old" value to $x, losing the pos() informat
+ion.
}
print "$x, ", pos($x), "\n";
[download]

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Comment on Re: search position is getting reset after 'local' Download Code

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Re^2: search position is getting reset after 'local' by dave_the_m (Monsignor) on Jun 12, 2006 at 12:51 UTC
No, local is more close to this: `{ $orig_value = \$x; x = \$tmp_new_value; ....; x = $orig_value; }` [download] and the OP has reported a genuine bug Dave.	[reply] [d/l]
Re^3: search position is getting reset after 'local' by Joost (Canon) on Jun 12, 2006 at 13:10 UTC
It's a bug, yes. I'm wondering what's wrong with local() then, since your equivalent does work as you would expect local to act: `$x = 'abc de'; $x =~ m/ /g; print "1=",pos $x; { $orig_value = \$x; x = \$tmp_new_value; print " 2=".pos $x; # ....; x = $orig_value; } print " 3=".pos $$orig_value; print " 4=".pos $x;` [download] output: `1=4 2= 3=4 4=4` [download] "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply] [d/l] [select]
Re^4: search position is getting reset after 'local' by dave_the_m (Monsignor) on Jun 12, 2006 at 13:35 UTC
I'm wondering what's wrong with local() then, since your equivalent does work as you would expect local to act It's to do with how magic attached to the value (eg pos magic) is sometimes copied to the new value, and sometimes copied back at the end. For example, a localised %ENV still needs to affect environment variables. It's on my Big List of Things To Fix At Some Point. Dave.	[reply]


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