From a8e9a9eae4276258a9d0b29334b4dd82c2695dc8 Mon Sep 17 00:00:00 2001
From: Pete Shadbolt <pete.shadbolt@gmail.com>
Date: Mon, 16 May 2016 20:04:58 +0100
Subject: [PATCH] Start diffing

---
 abp/graphstate.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/abp/graphstate.py b/abp/graphstate.py
index 0fb9ea7..0970a25 100644
--- a/abp/graphstate.py
+++ b/abp/graphstate.py
@@ -13,7 +13,7 @@ except ImportError:
     print "Could not import networkx: layout will not work"
 
 
-class GraphState(object):
+class BaseGraphState(object):
 
     def __init__(self, nodes = []):
         self.ngbh = {}
@@ -231,3 +231,11 @@ class GraphState(object):
     def __eq__(self, other):
         """ Check equality between graphs """
         return self.ngbh == other.ngbh and self.vops == other.vops
+
+class DiffedGraphState(BaseGraphState):
+    pass
+
+class GraphState(BaseGraphState):
+    pass
+
+