Java-C++ class binding

/* Java class */
public void FooHandler {
	private long mHandle; // stores native pointer 

	/* Creates c++ object and returns it's pointer */
	private native long init();
	
	/* Calls "delete" on c++ object  */
	private native void destroy(long handle);
	
	/* Arbitrary native method */
	private native int bar(long handle, int a, float b);
	
	public FooHandler() {
		mHandle = init();
		
		if(mHandle == 0) {
			throw Exception();
		}
	}
	
	public void destroy() {
		destroy(mHandle);
		mHandle = 0;
	}
	
	public int bar(int a, float b) {
		return bar(mHandle, a, b);
	}
}

/* C++ class */

class CFoo {
	public:
		CFoo() {}
		virtual ~CFoo() {}
		int bar(int a, float b) { ... }
};

/* JNI part */

jlong com_example_FooHandler_init() {
	CFoo* pMyFoo = new CFoo();
	return (jlong)pMyFoo; // cast the pointer to jlong
}

void com_example_FooHandler_destroy(jlong handle) {
	CFoo* pMyFoo = (CFoo*)handle;
	delete pMyFoo;
}

jint com_example_FooHandler_bar(jlong handle, jint a, jfloat b) {
	CFoo* pMyFoo = (CFoo*)handle;
	return pMyFoo->bar(a, b);
}