def addOperation(self, OperationType, NodeA, NodeB = None):
# search for the Operation with the Same Properties
i = 0
while i < len(self.Content):
if (self.Content[i].OperationType == OperationType) and \
(self.Content[i].NodeA == NodeA) and \
(self.Content[i].NodeB == NodeB):
# ...
return i
i += 1
NewElement = DAGElement(OperationType)
NewElement.NodeA = NodeA
NewElement.NodeB = NodeB
self.Content.append(NewElement)
return i
