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vendor/symfony/http-client/Internal/Canary.php

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+<?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\HttpClient\Internal;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ *
+ * @internal
+ */
+final class Canary
+{
+    private $canceller;
+
+    public function __construct(\Closure $canceller)
+    {
+        $this->canceller = $canceller;
+    }
+
+    public function cancel()
+    {
+        if (($canceller = $this->canceller) instanceof \Closure) {
+            $this->canceller = null;
+            $canceller();
+        }
+    }
+
+    public function __destruct()
+    {
+        $this->cancel();
+    }
+}