value_type& front ( );
const value_type& front ( ) const;

Access next element

Returns a reference to the next element in the queue. This is the "oldest" element in the queue and the same element that is popped out from the queue if member queue::pop is called.

This member function effectively calls the member with the same name in the underlying container object.

Parameters

Return value

Member type value_type is defined to the type of value contained by the underlying container, which shall be the same as the first template parameter (T).

Example

// queue::front
#include <iostream>
#include <queue>
using namespace std;

int main ()
{
  queue<int> myqueue;

  myqueue.push(77);
  myqueue.push(16);

  myqueue.front() -= myqueue.back();

  cout << "myqueue.front() is now " << myqueue.front() << endl;

  return 0;
}

Output:

myqueue.front() is now 61

Complexity

See also