continued refactoring.

laravel/cache/manager.php

@@ -52,7 +52,7 @@ class Manager {
 
 		if ( ! array_key_exists($driver, $this->drivers))
 		{
-			if ( ! in_array($driver, array('apc', 'file', 'memcached')))
+			if ( ! $this->container->registered('laravel.cache.'.$driver))
 			{
 				throw new \Exception("Cache driver [$driver] is not supported.");
 			}

laravel/cache/memcached.php

@@ -1,6 +1,5 @@
 <?php namespace Laravel\Cache;
 
-use Memcache;
 use Laravel\Config;
 
 class Memcached extends Driver {
@@ -25,7 +24,7 @@ class Memcached extends Driver {
 	 * @param  Memcache  $memcache
 	 * @return void
 	 */
-	public function __construct(Memcache $memcache, $key)
+	public function __construct(\Memcache $memcache, $key)
 	{
 		$this->key = $key;
 		$this->memcache = $memcache;