Question

I have a function called by a thread.this function has a unique argument which is queue::my_queue . So I need to perform a cast on void pointer in the method called by the thread as follows:

void *AddPacket(void *Ptr) 
{     queue<int> my_queue = (queue*)Ptr ; 
       my_queue.push(byte) ; 
}

and in the main, I do:

int main()
{   // do business
  pthread_create(&thread, NULL, &AddPacket, (void*)queue) ; 
}

But both conversions are wrong.

the first conversion leads to the error:

request for member ‘push’ in ‘my_queue’, which is of non-class type ‘queue*’

and the second one:

invalid cast from type ‘queue’ to type ‘void*’

How can I solve the problem?

Answer 1

Try:

queue<int> *my_queue = (queue<int> *)Ptr ;
my_queue->push(byte) ;

pthread_create(&thread, NULL, &AddPacket, (void*)&queue) ; 

.. something along those lines, anyway