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Re: unexpected close() success on (non-) filehandle

by tachyon (Chancellor)
on Nov 21, 2001 at 18:33 UTC ( #126767=note: print w/replies, xml ) Need Help??


in reply to unexpected close() success on (non-) filehandle

No this is not incorrect at all, it is exactly what you expect. The glob *X consists of the following elements $X @X %X &X and X (the filehandle). When you write open *X, $foo Perl opens $foo onto the filehandle X from the *X glob. Thus when you say close X you close the filehandle X - this is what your close $_ example does. When you say close *X Perl also does a close X as X is the filehandle in the *X glob - this is what your close $rh{$_} example does.

Update (changed code to better example)

#/usr/bin/perl -w use strict; my %rh = (E=> *E, F=> *F, G=> *G); { no strict 'refs'; print "\n\n\$_ has a value, used as a hard reference\n"; for (values %rh) { open $_, ">test.txt" or die $!; print $_ "$_ This works\n"; close $_ or die $!; open $_, "<test.txt" or die $!; print <$_>; close $_ or die $!; unlink "test.txt" or die $!; } print "\n\n\$_ has a value, used as a symbolic reference\n"; for (keys %rh) { open $_, ">test.txt" or die $!; print $_ "$_ This works\n"; close $_ or die $!; open $_, "<test.txt" or die $!; print <$_>; close $_ or die $!; unlink "test.txt" or die $!; } } # and under strict.... print "\n\n\$_ has a value, used as a hard reference\n"; for (values %rh) { open $_, ">test.txt" or die $!; print $_ "$_ This works\n"; close $_ or die $!; open $_, "<test.txt" or die $!; print <$_>; close $_ or die $!; unlink "test.txt" or die $!; } print "\n\n\$_ has a value, used as a symbolic reference\n"; for (keys %rh) { open $_, ">test.txt" or die $!; print $_ "$_ This works\n"; close $_ or die $!; open $_, "<test.txt" or die $!; print <$_>; close $_ or die $!; unlink "test.txt" or die $!; }

Part of the problem you are having is not distinguishing a hard reference (OK under strict) an a symbolic reference (not OK under strict)

cheers

tachyon

s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print

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