IPAddr.new

# File tmp/rubies/ruby-3.1.3/lib/ipaddr.rb, line 585
def initialize(addr = '::', family = Socket::AF_UNSPEC)
  @mask_addr = nil
  if !addr.kind_of?(String)
    case family
    when Socket::AF_INET, Socket::AF_INET6
      set(addr.to_i, family)
      @mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK
      return
    when Socket::AF_UNSPEC
      raise AddressFamilyError, "address family must be specified"
    else
      raise AddressFamilyError, "unsupported address family: #{family}"
    end
  end
  prefix, prefixlen = addr.split('/', 2)
  if prefix =~ /\A\[(.*)\]\z/i
    prefix = $1
    family = Socket::AF_INET6
  end
  if prefix =~ /\A(.*)(%\w+)\z/
    prefix = $1
    zone_id = $2
    family = Socket::AF_INET6
  end
  # It seems AI_NUMERICHOST doesn't do the job.
  #Socket.getaddrinfo(left, nil, Socket::AF_INET6, Socket::SOCK_STREAM, nil,
  #                  Socket::AI_NUMERICHOST)
  @addr = @family = nil
  if family == Socket::AF_UNSPEC || family == Socket::AF_INET
    @addr = in_addr(prefix)
    if @addr
      @family = Socket::AF_INET
    end
  end
  if !@addr && (family == Socket::AF_UNSPEC || family == Socket::AF_INET6)
    @addr = in6_addr(prefix)
    @family = Socket::AF_INET6
  end
  @zone_id = zone_id
  if family != Socket::AF_UNSPEC && @family != family
    raise AddressFamilyError, "address family mismatch"
  end
  if prefixlen
    mask!(prefixlen)
  else
    @mask_addr = (@family == Socket::AF_INET) ? IN4MASK : IN6MASK
  end
end