From 77f78d9bc33cacd28bdd30482403da48895b19c5 Mon Sep 17 00:00:00 2001
From: Jan Sorgalla <jsorgalla@googlemail.com>
Date: Sun, 5 Oct 2014 19:42:19 +0200
Subject: [PATCH] Avoid unnecessary creation of closures when no canceller is
 given

---
 src/Promise.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Promise.php b/src/Promise.php
index ead3106e..aa8d914e 100644
--- a/src/Promise.php
+++ b/src/Promise.php
@@ -25,6 +25,10 @@ public function then(callable $onFulfilled = null, callable $onRejected = null,
             return $this->result->then($onFulfilled, $onRejected, $onProgress);
         }
 
+        if (null === $this->canceller) {
+            return new static($this->resolver($onFulfilled, $onRejected, $onProgress));
+        }
+
         $this->requiredCancelRequests++;
 
         return new static($this->resolver($onFulfilled, $onRejected, $onProgress), function ($resolve, $reject, $progress) {