I hope I'm not confused with youre update, but I think I may understand what you are asking. Say, for example, your bit flag is set to my $bit_flag = 0b101; #5. And, you need to find out if the given bit flag has a bit flipped within the list of qw( 1 2 4 8 ). If this is the case (and I apologize if I am still not understanding), you could: 
#!/usr/bin/perl

use strict;
use warnings;

my $bit_flag = 5; #0b101
my @bit_list = qw( 1 2 4 8 16 );

# Assuming you want to test for truth of my above statment
# later in the application, binary 1/0 will work fine
my $bit_flipped = ( grep{ $bit_flag & $_ } @bit_list ) ? 1 : 0;

# Continue on with the application

[download]
Runing a bitwise and will simply tell you that there are some bits that are up in both the $bit_flat as within one of the values in the @bit_list.

CPAN has a good resource that might better explain what I am trying to say, while detailing the differences between the bitwise and (&) and the bitwise or (|).

Again, I hope I am understanding your question well enough to answer it. Good luck!

---hA||ta---- 
print$_ for(map{chr($_)}split(/\s+/,join(/\B?:\w+[^\s+]/,<DATA>)));
__DATA__
67 111 100 101 32 80 101 114 108

[download]

In reply to Re: Flipping bits and using flags by wazzuteke
in thread Flipping bits and using flags by BMaximus

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