protected function _createWpHookReplacement($wpHook)
{
    return ($wpHook instanceof WpHookReplacer)
        ? $wpHook
        : new WpHookReplacer($wpHook);
}

public function __construct(WP_Hook $wpHook)
{
    $this->wpHook    = $wpHook;
    $this->callbacks = &$wpHook->callbacks;
}