macOS Cast from void * to Objective-C object - EXC_BAD_ACCESS code = 2

[moonman239]

I have an Objective-C object named "LocationGetter", and a companion C++ object named "CppLocationGetter". The two objects are properties of each other, and they are supposed to communicate with each other. Unfortunately, when the C++ object sends "startLocationUpdates" to the Objective-C object, an EXC_BAD_ACCESS code 2 error results. Edited to add: The debugger says "CppLocationGetter"'s getter property is of type "observer *", although I did not define that type. Also, the memory address appears to be identical to that of my C++ object's "observer" property.

LocationGetter.m:

#import "LocationGetter.h"

#ifdef __cplusplus

usingnamespaceCppLocation;

CppLocationGetter::CppLocationGetter()

{

    LocationGetter *getter = [[LocationGetter alloc] initWithCppObject:this];

    this->getter = (__bridge void *)getter;

 

}

void CppLocationGetter::startLocationUpdates()

{

    [(__bridgeLocationGetter *)getter startLocationUpdates]; // EXC_BAD_ACCESS

}

#endif

#ifdef __OBJC__

@implementation LocationGetter

{

    CppLocation::CppLocationGetter *CppObj;

}

-(instancetype)initWithCppObject:(CppLocationGetter *)getter

{

    self = [self init];

    if (self) {

        CppObj = getter;

    }

    returnself;

}

-(void)startLocationUpdates

{

    CppObj->CppLocationGetter::observer->locationUpdated(10, 01, 10);

}

@end

#endif

LocationGetter.h:

#ifdef __cplusplus

namespace CppLocation

{

struct CppLocationObserver

{

    virtual void locationUpdated(float latitude, float longitude, float accuracy) = 0;

};

class CppLocationGetter {

    void *getter;

public:

    CppLocationGetter();

    CppLocationObserver *observer;

    void startLocationUpdates();

};

}

#endif



#ifdef __OBJC__

#include <Foundation/Foundation.h>

@interface LocationGetter : NSObject

-(instancetype)initWithCppObject:(CppLocation::CppLocationGetter *)getter;

-(void)startLocationUpdates;

@end

#endif

 

[moonman239]

I fixed it by adding

CFBridgingRetain(getter)

to my CppLocationGetter constructor. I don't have a CFBridgingRelease call yet, but that might be a good idea.