Question

I have an Objective-C class which one of it’s variables is an C++ object (most of my code is C++, but I need some ObjC classes to integrate with iOS libraries). Does Objective-C++ guarantees that the C++ object will be correctly destroyed when the Objective-C object is destroyed?

Some example code:

class MyCppClass {
    // ...
};

@interface MyObjCClass : NSObject {
    MyCppClass myCppObject; // is it ok to do it?
}

// ...

@end

Answer 1

Yes. After the -dealloc method is called, a hidden .cxx_destruct method is called. This method calls all the destructors of all instance variables that have a destructor.