NAME
    Tie::NumRange - Keeps a number within a range of values.

SYNOPSIS
      use Tie::NumRange;
      
      tie my($chr), Tie::NumRange => (
        100,  # initial
        0,    # min
        255,  # max
      );
      
      $chr *= 3;  # $chr is 255
      $chr = -5;  # $chr is 0
      
      tie my($positive), Tie::NumRange => (
        1,
        1,
        undef
      );
      
      $positive = 2**16;  # ok
      $positive = 0;      # $pos is 1
      
      
      tie my($wrap), Tie::NumRange::Wrap => (
        0,   # initial
        0,   # min
        10,  # max
      );
      
      while ($wrap < 10) {
        # 0, 3, 6, 9, 2, 5, 8, 1, 4, 7
        $wrap += 3;
      }

DESCRIPTION
    This module institutes a range of values for a number. The lower
    and upper bounds can be unlimited by passing `undef' in their
    place.

  `Tie::NumRange' Constructor

      tie $number, Tie::NumRange => ($init, $min, $max);

    If `$min' is `undef', the number has no lower bound. Likewise
    for `$max'.

  `Tie::NumRange::Wrap' Constructor

      tie $number, Tie::NumRange::Wrap => ($init, $min, $max);

    Neither range can be `undef'. The value will wrap around when it
    goes outside the stated bounds.

AUTHOR
      Jeff "japhy" Pinyan
      CPAN ID: PINYAN
      japhy@pobox.com
      http://www.pobox.com/~japhy/

