class Concurrent::ThreadSafe::Util::PowerOfTwoTuple

def hash_to_index(hash)
  (size - 1) & hash
end

def initialize(size)
  raise ArgumentError, "size must be a power of 2 (#{size.inspect} provided)" unless size > 0 && size & (size - 1) == 0
  super(size)
end

def next_in_size_table
  self.class.new(size << 1)
end

def volatile_get_by_hash(hash)
  volatile_get(hash_to_index(hash))
end

def volatile_set_by_hash(hash, value)
  volatile_set(hash_to_index(hash), value)
end