From: Ch Skilbeck <ruby@...>
Date: 2006-08-07T23:29:50+09:00
Subject: nextPowerOf2(n)

Hi,

Can someone tell me if there's a better way to do this? It takes a 
number and returns the next power of 2 up (or the original if it was 
already a power of 2) Specifically, are there features of Ruby that I 
should be using in this case?

Cheers,
Charlie.

def nextPowerOf2(n)
  raise "integer please" if !n.kind_of? Integer
  high = 0
  count = 0
  (0..n.size * 8 - 2).each {|b| count += n[b] ; high = b if n[b] != 0}
  1 << high + (count > 1 ? 1 : 0)
end


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