C++ Queue function returns the value of the last element of the queue. Here last element is the one that is newest. The element which was most recently added is returned.
Syntax
Example
value_type& back();
const value_type& back() const;
Parameters
The function does not take any parameters. It is only used to return the value of the last element.
Return value
The function returns the last element of the queue.
Example
Example
#include <iostream>
#include <queue>
int main()
{
std::queue<int> newqueue;
newqueue.push(24);
newqueue.push(80);
newqueue.back () += newqueue.front();
std::cout <<"newqueue.back() is modified to" << newqueue.back ();
return 0;
}
Output:
Output
newqueue.back() is modified to 104
Complexity
The complexity of the function is constant.
Data races
The function accesses the container. For returning the last element the whole queue container is accessed and then the value of the newest element is given.
Exception Safety
Guarantee as equivalent to the operations that are performed on the underlying container object is provided.