Re: shared_ptr in priority_queue: how to make it work

int main(){
         priority_queue<shared_ptr<myClass> > pq;
         shared_ptr<myClass> temp(new myClass(1));
         pq.push(temp);
         temp.reset(new myClass(2));
         pq.push(temp);
         temp.reset(new myClass(3));
         pq.push(temp);
         while (!pq.empty()){
                 temp = pq.top();
                 cout<<temp->a<<endl;
                 pq.pop();
         }
}

----------------------------------------------------//over

I was expecting the priority_queue to pop 1 first and 3 last. However,
it pops 3 first and 1 last. (If I input 3,2,1 in a sequence, then the
output will be 1,2,3. So it seems that there is no sorting at all)