[ndnSIM] How to Distinguish ContentTypes and downcast to them

[Muhammad Hosain Abdollahi Sabet]

​Hello everyone,

My application recieves a Data packet. How can I downcast it to its Type? I
mean, for example downcast a data packet to Key or Link or Nack based on
getContentType of the packet. I know it is more of a c++ question, but
again I haven't been able to do it yet in ndnSIM.

Thanks,
Sabet
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