Merge Function in C++

Question

What's wrong in this way? Why is this not working?
After executing this program res.queue is still empty
Queue operator+(Queue obj){
Queue res;
int ar[8];
merge(this->queue,(this->queue+this->size),obj.queue,(obj.queue+obj.size),res.queue);
return res;
}

Answer 1

Arsenic could you give an example as queue is not a vector.
if it would be a vector I would have called it as
merge(queue.begin(),queue.end().... right

The code is here and I just added the above query's lines to this.
https://www.sololearn.com/coach/917?ref=app

Answer 2

Can I have a look at your entire code ?

Because merge() required iterators to work with and looks like you are not calling it as it should be called.