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vendor/symfony/dependency-injection/Argument/RewindableGenerator.php

@@ -0,0 +1,47 @@
+<?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\Argument;
+
+/**
+ * @internal
+ */
+class RewindableGenerator implements \IteratorAggregate, \Countable
+{
+    private $generator;
+    private $count;
+
+    /**
+     * @param callable     $generator
+     * @param int|callable $count
+     */
+    public function __construct(callable $generator, $count)
+    {
+        $this->generator = $generator;
+        $this->count = $count;
+    }
+
+    public function getIterator()
+    {
+        $g = $this->generator;
+
+        return $g();
+    }
+
+    public function count()
+    {
+        if (\is_callable($count = $this->count)) {
+            $this->count = $count();
+        }
+
+        return $this->count;
+    }
+}