[ndnSIM] Ways to create new Interest object

[Junxiao Shi]

Hi Mudasir


> *Method #2:* Creating Interest from an existing Interest like this:
> const Name& tempName = "---";
> Interest tempInterest = Interest(interest.wireEncode());
> tempInterest.setName(tempName);
>
> *My problem:*
> Now, I know Method#2 is the official way that meets my requirements. But
> the thing is, when I use method#2 it gives error on *findOrInsert* method
> in *pit.cpp* file and I don't understand its reason.
> auto entry = make_shared<Entry>(interest);
>

https://github.com/named-data/ndn-cxx/blob/ebfe4a207f658a77b5249cda4bd0bc35ede82066/src/interest.hpp#L64-L65
In certain contexts that use Interest::shared_from_this(), Interest must be
created using `make_shared`. Otherwise, .shared_from_this() will trigger
undefined behavior.

PIT is one of those contexts. So are many other places in NFD.
Thus, you need:
auto tempInterest = std::make_shared<Interest>(interest.wireEncode());
tempInterest->setName(tempName);

Yours, Junxiao
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