Re^3: sub that sets $


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Re^3: sub that sets $_

by TheDamian (Vicar)

on Jun 29, 2005 at 00:04 UTC ( [id://470878]=note: print w/replies, xml )

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in reply to Re^2: sub that sets $_
in thread sub that sets $_

Which means that while ($z = prompt "") { will set $_ and $z. This is a bad idea. What if the code is used in an inner loop? when the outer loop uses $_ for example?

Yes, that is a nuisance. I'm working on overcoming that problem, but it's difficult: Perl never quite gives you enough context information to detect the assignment. :-(

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Re^4: sub that sets $_
by TheDamian (Vicar) on Jun 29, 2005 at 00:54 UTC

Want

want('BOOL')

my $flipflop = 0;

sub foo {
    use Want qw(want);

    print 'not ' if !want 'BOOL';
    print "bool\n";

    return $flipflop=!$flipflop;   # alternate true and false
}

for (1..3) {
    while (foo() ) {
        # print "here 1\n";
    }
    while ($answer = foo() ) {
        # print "here 2\n";
    }
}
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Unfortunately, under 5.8.3 I get bus errors if there I uncomment the print statements, or if there is anything in the while blocks. :-(

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