[ndnSIM] Cache according to hopcount

[陈胜蓝]

Hi All,
I would like to implement a hopcount-based cache policy,it is that each node will cache a content with a particular hopcount number,such as 3.Before a content is going to be sent,the hopcount of a content will be set to be 0 if it is cached,
If I would modify the OnData() function?How can I implement the policy? 
Thank you


Beat regards.
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