From 826d727d5466ec0378ea1d54ad4471d8f6e289f6 Mon Sep 17 00:00:00 2001
From: Isaku Yamahata <yamahata@valinux.co.jp>
Date: Mon, 1 Apr 2013 11:58:49 +0900
Subject: [PATCH] ryu/lib/packet/packet.py: should use isinstance instead of
 __class__.__base__

The current implementation doesn't allow inheriting twice from class PacketBase.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 ryu/lib/packet/packet.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ryu/lib/packet/packet.py b/ryu/lib/packet/packet.py
index a461eeea..da9c412d 100644
--- a/ryu/lib/packet/packet.py
+++ b/ryu/lib/packet/packet.py
@@ -42,7 +42,7 @@ class Packet(object):
         self.data = bytearray()
         r = self.protocols[::-1]
         for i, p in enumerate(r):
-            if p.__class__.__bases__[0] == packet_base.PacketBase:
+            if isinstance(p, packet_base.PacketBase):
                 if i == len(r) - 1:
                     prev = None
                 else: