Laravel 4控制器构造函数

我只想知道在我的PostController中创建构造函数是否可以？

示例1:

public class PostController extends BaseController
{
   protected $posts;
    //Is this ok?
   public function __construct(Post $posts){
        $this->posts = $posts;
     }
   public function getPosts(){
      $posts = $this->posts->all();
      return View::make('get-index',compact('posts'))
  }
}