queue::back
Returns a reference to the last and most recently added element at the back of the queue.
reference back( );
const_reference back( ) const;
Return Value
The last element of the queue. If the queue is empty, the return value is undefined.
Remarks
If the return value of back is assigned to a const_reference, the queue object cannot be modified. If the return value of back is assigned to a reference, the queue object can be modified.
When compiling with _SECURE_SCL 1, a runtime error will occur if you attempt to access an element in an empty queue. See Checked Iterators for more information.
Example
// queue_back.cpp
// compile with: /EHsc
#include <queue>
#include <iostream>
int main( )
{
using namespace std;
queue <int> q1;
q1.push( 10 );
q1.push( 11 );
int& i = q1.back( );
const int& ii = q1.front( );
cout << "The integer at the back of queue q1 is " << i
<< "." << endl;
cout << "The integer at the front of queue q1 is " << ii
<< "." << endl;
}
Output
The integer at the back of queue q1 is 11.
The integer at the front of queue q1 is 10.
Requirements
Header: <queue>
Namespace: std