I have looked around and found little on how to flip bits in Perl. Should I be thinking bit-strings and vec or integers and masks as in the C style?

My data comes in sets of 9 booleans which are named "1" through "9". The operations required:

• have name, clear bit
• have name(s), set bit(s)
• get count of set bits
• have one set bit, get its name
• have multiple set bits, get names (debugging only)
• bit-wise logical ops, OR, AND, ...

This is off the cuff sample code:

$state = $prev | $curr | $next;

if ( FULL == count_bits( $state ) ) {

   # unset these bits in other blocks
   for my $block ( @grid ){
       $block &= ~$state;

       # cache block if appropriate
       if ( TERMINAL == count_bits( $block) ) {
           push @feed_thru, $block;
       }elsif ( FULL == count_bits( $block ) ) {
           push  @propagate, $block;
       }
   }
}
[download]

Be well, rir

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.