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

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.

  Constructor

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

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

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