--- /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\Loader\Configurator\Traits;
+
+use Symfony\Component\DependencyInjection\ChildDefinition;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+
+/**
+ * @method $this parent(string $parent)
+ */
+trait ParentTrait
+{
+ /**
+ * Sets the Definition to inherit from.
+ *
+ * @param string $parent
+ *
+ * @return $this
+ *
+ * @throws InvalidArgumentException when parent cannot be set
+ */
+ final protected function setParent($parent)
+ {
+ if (!$this->allowParent) {
+ throw new InvalidArgumentException(sprintf('A parent cannot be defined when either "_instanceof" or "_defaults" are also defined for service prototype "%s".', $this->id));
+ }
+
+ if ($this->definition instanceof ChildDefinition) {
+ $this->definition->setParent($parent);
+ } elseif ($this->definition->isAutoconfigured()) {
+ throw new InvalidArgumentException(sprintf('The service "%s" cannot have a "parent" and also have "autoconfigure". Try disabling autoconfiguration for the service.', $this->id));
+ } elseif ($this->definition->getBindings()) {
+ throw new InvalidArgumentException(sprintf('The service "%s" cannot have a "parent" and also "bind" arguments.', $this->id));
+ } else {
+ // cast Definition to ChildDefinition
+ $definition = serialize($this->definition);
+ $definition = substr_replace($definition, '53', 2, 2);
+ $definition = substr_replace($definition, 'Child', 44, 0);
+ $definition = unserialize($definition);
+
+ $this->definition = $definition->setParent($parent);
+ }
+
+ return $this;
+ }
+}