# File lib/memcache.rb, line 175 def cas(key, value, opts) raise 'opts must be hash' unless opts.instance_of?(Hash) key = key.to_s backup.cas(key, value, opts) if backup expiry = opts[:expiry] || default_expiry flags = opts[:flags] || 0 data = marshal(value, opts) server(key).cas(key, data, opts[:cas], expiry, flags) && value end