public function __construct($prefix, $decorated)
{
if (!function_exists('apcu_fetch')) {
throw new \RuntimeException('Unable to use ApcClassLoader as APC is not installed.');
}
if (!method_exists($decorated, 'findFile')) {
throw new \InvalidArgumentException('The class finder must implement a "findFile" method.');
}
$this->prefix = $prefix;
$this->decorated = $decorated;
}