I think that I would splurge a little on memory and use a hash (or maybe an array if the names are really '1' .. '9'). All the operations you want are easy and straightforward with a hash: 

my %state;
@state{1..9}=();

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  1. have name, clear bit 
    $state{$name} = undef;

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  2. have name(s), set bit(s) 
    @state{@names} = (1) x @names;

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  3. get count of set bits 
    my $count = grep {$_} values %state;

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  4. have one set bit, get its name 
    my $setname = (grep {$state{$_}} keys %state)[0];

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  5. have multiple set bits, get names (debugging only) 
    my @setnames = grep {$state{$_}} keys %state;

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  6. bit-wise logical ops, OR, AND, ... 
    # same as ordinary perl
print $foo if $state{$one} && $state{$tother};

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A small hash like this isn't going to break the bank, and the perl operations to maintain it are much simpler than bit-twiddling.

Fixed typo in #2, thanks blokhead++

After Compline,
Zaxo

In reply to Re: bit-wise by Zaxo
in thread bit-wise by rir

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