subclassOf() public static method

public static subclassOf ( $value, $class, $message = '' )
 /**
  * ContaoRepository constructor.
  *
  * @param string $modelClass Model class.
  */
 public function __construct($modelClass)
 {
     Assert::classExists($modelClass);
     Assert::subclassOf($modelClass, 'Model');
     $this->modelClass = $modelClass;
 }