[ndnSIM] forward declaration error

[Xiao yan Hu]

Hi,

I kept getting errors " error: forward declaration of 'const struct
ns3::ndn::cs::Entry'"?
would you guys please tell me what does this mean?
Actually I want to write my own custom forwarding strategy which is
extended from best route and in which "Ptr<const cs::Entry> entry" is the
argument of one function.
If I want to use Ptr<const cs::Entry>, how should I declare it?
Thanks very much!

Sincerely,
Xiaoyan
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