Box2D Forums

//Rover-Meteor Collision
    std::vector<b2Body *>toDestroy;
    std::vector<MyContact>::iterator pos;
    for(pos = _contactListener->_contacts.begin();
        pos != _contactListener->_contacts.end(); ++pos) {
        MyContact contact = *pos;
       
        b2Body *bodyA = contact.fixtureA->GetBody();
        b2Body *bodyB = contact.fixtureB->GetBody();
       
        if (bodyA->GetUserData() != NULL && bodyB->GetUserData() != NULL) {
       
            CCSprite *spriteA = (CCSprite *) bodyA->GetUserData();
            CCSprite *spriteB = (CCSprite *) bodyB->GetUserData();
           
            // Sprite A = ball, Sprite B = Block
            if ([spriteA isKindOfClass:[Rover class]]) {
                NSLog(@"A-Rover && B-Meteor");
                if (std::find(toDestroy.begin(), toDestroy.end(), bodyB) == toDestroy.end()) {
                    //DONT DESTROY body, push it into an array? and it will be cleaned up later
                    toDestroy.push_back(bodyA);
                    toDestroy.push_back(rover.wheelLBody);
                    toDestroy.push_back(rover.wheelRBody);
                }
            }
            // Sprite B = block, Sprite A = ball
            else if ([spriteB isKindOfClass:[BMeteor class]]) {
                NSLog(@"A-Meteor && B-Rover");
                if (std::find(toDestroy.begin(), toDestroy.end(), bodyA) == toDestroy.end()) {
                    toDestroy.push_back(bodyA);
                }
            }     
        }       
    }
    // Clean up array of bodies to destroy?
    std::vector<b2Body *>::iterator pos2;
    for(pos2 = toDestroy.begin(); pos2 != toDestroy.end(); ++pos2) {
        b2Body *body = *pos2;     
        if (body->GetUserData() != NULL) {
            NSLog(@"is vector iterator being called....YES");
            CCSprite *sprite = (CCSprite *) body->GetUserData();
            [sceneSpriteBatchNode removeChild:sprite cleanup:YES];
        }
        isRoverAlive = FALSE;
        world->DestroyBody(body);
       
    }
   
    if (toDestroy.size() > 0) {
        PLAYSOUNDEFFECT(CAR_HIT);
    }