queue within a queue

[rro0035]

how can i store a queue of type integers within another queue of type queue.

#include <iostream>
#include <queue>

using namespace std;

int main()
{
queue<queue> myqueue;
queue<int> myqueue2;
myqueue2.push(27);
myqueue.push(myqueue2);

return 0;
}

didn't work but not sure why. the idea is to replicate the effects of an 2d array but i'm not allowed to use 2d arrays.

[Athar]

It's queue<queue<int> >...

[Stewbond]

Another thing that's nice to do is typedef:

#include <queue>
typedef std::queue<int> InnerQueue;
typedef std::queue<InnerQueue> OuterQueue;

int main()
{
  OuterQueue myqueue;
  InnterQueue temp;

  temp.push(27);
  myqueue.push(temp);

  return 0;
}

[rro0035]

thanks athar it works but now how do i show/modify them? the central queue i mean

#include <iostream>
#include <queue>

using namespace std;

int main()
{
queue<queue<int> > myqueue;
queue<int>myqueue2;
myqueue2.push(123);
myqueue2.push(345);
myqueue.push(myqueue2);

cout<<myqueue.front(myqueue2.front())<<endl;//from here doesn't work
//myqueue2.pop();
//cout<<myqueue.front()<<endl;
return 0;
}

[Stewbond]

myqueue.front() returns the first myqueue2 element. So you would do it this way:

cout << myqueue.front().front() << endl;

Remember, it takes no arguments are returns whatever is held by the queue:
http://www.cplusplus.com/reference/stl/queue/front/

[rro0035]

ok thanks but now how would i pop the internal queue so the second cout displays 456?

[Stewbond]

myqueue.front().pop();