Re^3: Trying to optimize de-referenced hash slice without scope variables...

Your $data and @_ are empty here, so this won't work the same because of autovivication. The number of $VAR variables is different, because you have a .. d in the first and a .. c in the second expample.

All of this should work if you actually fill $data and $_[3] with a hash reference that uses those keys.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

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Re^4: Trying to optimize de-referenced hash slice without scope variables... by monsieur_champs (Curate) on Jun 15, 2004 at 17:56 UTC
Autovivification shouldn't fill in the data structure as I access it? So both the accesses should produce the same data structures (that's autovivification work, I guess), and Data::Dumper should produce the same result in both cases. BTW, here is the result, again: `perl -MData::Dumper $data = { a=>'b', c=>'d', e=>'h', i=>'j' }; $_[3] = { a=>'b', c=>'d', e=>'h', i=>'j' }; print Dumper @$data{'a','c','e'}; print "\n"; print Dumper @{$_[3]}{'a','c','e'}; print "\n";` [download] and the result was: `$VAR1 = 'b'; $VAR2 = 'd'; $VAR3 = 'h'; $VAR1 = 'b'; $VAR2 = 'd'; $VAR3 = 'h';` [download] exactly as expected. I'm confused. What's the problem with auto-vivification? Its supposed to fill in the "gore details", it isn't? Thank you for your time and patience! -- monsieur_champs	[reply] [d/l] [select]

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Re^4: Trying to optimize de-referenced hash slice without scope variables...
by monsieur_champs (Curate) on Jun 15, 2004 at 17:56 UTC

Autovivification shouldn't fill in the data structure as I access it? So both the accesses should produce the same data structures (that's autovivification work, I guess), and Data::Dumper should produce the same result in both cases.

BTW, here is the result, again:

perl -MData::Dumper
$data = { a=>'b', c=>'d', e=>'h', i=>'j' };
$_[3] = { a=>'b', c=>'d', e=>'h', i=>'j' };
print Dumper @$data{'a','c','e'};
print "\n";
print Dumper @{$_[3]}{'a','c','e'};
print "\n";
[download]

$VAR1 = 'b';
$VAR2 = 'd';
$VAR3 = 'h';

$VAR1 = 'b';
$VAR2 = 'd';
$VAR3 = 'h';
[download]

Thank you for your time and patience!

-- monsieur_champs

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