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Aug 17, 2011 · Objective-C++. The restrictions on ARC pointers in C structures don't apply to C++ structures. You can use __strong and __weak object pointers in C++ structures. Doing so makes them non-POD types: They implicitly gain a constructor and a destructor (or some extra code in their constructors and destructors if they have explicit ones) that zero and free the Objective-C fields.