Wrapping cache methods in CI

cached.php

<?php

protected function cached($key, $callback, $life)
{
	$this->load->driver('cache', array('adapter' => 'memcached'));
		
	if (!$response = $this->cache->get($key)) {
		$response = $callback($this);
			
		if ($response) {
			$this->cache->save($key, $response, $life);
		}
	}
		
	return $response;
}