Objective-C++ and objects retaining - objective-c

Question

Consider this code example:
class SomeArbitrarilyNamedClassPlusPlus {
public:
SomeArbitrarilyNamedClassPlusPlus(NSObject *object) { object_ = object; }
SomeArbitrarilyNamedClassPlusPlus() { object_ = nil; }
private:
NSObject *object_;
};
#interface SomeArbitrarilyNamedClassObjective : NSObject
{
SomeArbitrarilyNamedClassPlusPlus *_plusPlusObject;
}
#end
#implementation SomeArbitrarilyNamedClassObjective
-(id)init
{
if ((self = [super init]))
{
_plusPlusObject = new SomeArbitrarilyNamedClassPlusPlus(self);
}
return self;
}
-(void)dealloc
{
NSLog(#"deallocated");
delete _plusPlusObject;
}
#end
int main(int argc, const char * argv[])
{
{
SomeArbitrarilyNamedClassObjective *object = [[SomeArbitrarilyNamedClassObjective alloc] init];
}
return 0;
}
The object variable never gets deallocated. You can check it with Instruments - additional retain counter increment happens inside the -(id)init call.
I would never expect that attributes in C++ classes are strong and this makes me wondering - is there a way to make c++ attributes pointing on Objective-C objects weak?
UPDATE:
There is a way to avoid this using pointers to void in C++ class instead of NSObject* and initialize C++ class in -(id)init method like that:
...
_plusPlusObject = new SomeArbitrarilyNamedClassPlusPlus((__bridge void*)self);
...
However, the question still remains - is there a way to save Objective-C types inside C++ classes but make them weak?

Answer 1

Well, the answer turned out to be quite straightforward - use __weak attribute in C++ class:
class SomeArbitrarilyNamedClassPlusPlus {
public:
SomeArbitrarilyNamedClassPlusPlus(NSObject* object) { object_ = object; }
SomeArbitrarilyNamedClassPlusPlus() { object_ = nil; }
private:
__weak NSObject* object_;
};