--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection;
+
+/**
+ * IntrospectableContainerInterface defines additional introspection functionality
+ * for containers, allowing logic to be implemented based on a Container's state.
+ *
+ * @author Evan Villemez <evillemez@gmail.com>
+ *
+ * @deprecated since version 2.8, to be merged with ContainerInterface in 3.0.
+ */
+interface IntrospectableContainerInterface extends ContainerInterface
+{
+ /**
+ * Check for whether or not a service has been initialized.
+ *
+ * @param string $id
+ *
+ * @return bool true if the service has been initialized, false otherwise
+ */
+ public function initialized($id);
+}