CODEWITHSUNDEEP
javac++androidjava-native-interface
fifth
fifth

Reputation: 4349

How to keep a C++ object inside Java code? Possible?

First I've got a legacy C++ library, and I'm migrating my app to Android with new UI.

During runtime, there might be multiple C++ objects created and destroyed dynamically. I built a set of JNI native methods to call into library to get that. But where should I keep those C++ objects? I have to keep track of them and free them if they're unnecessary.

So far I only knew Java can't reference to a C++ object. Is it possible to make a Java wrapper class which include a reference to C++ object?

Thanks.

Upvotes: 5

Views: 2020

Answers (2)

Samuel Audet
Samuel Audet

Reputation: 4994

JavaCPP takes care of this detail by saving it into a wrapping peer Pointer object.

Upvotes: -1

weekens
weekens

Reputation: 8292

Yes, it's possible. You can store a pointer to your C++ object in a simple java int. That's exactly how SWIG does that.

Upvotes: 3

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