deque::push_front, deque::pop_front (STL Sample)

The sample code below illustrates how to use the deque::push_front and deque::pop_front STL functions in Visual C++.

Required Header:
<deque>

   void push_front(const T& x);
   void pop_front();

Note: The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.

Description:
The push_front function inserts an element with value x at the beginning of the deque container. The pop_front function removes the first element of the deque container, which must be non-empty.

Sample Code:

//////////////////////////////////////////////////////////////////////
//
// Compile options needed: -GX
//
// deque.cpp :
//
// Functions:
//
//    deque::push_front
//    deque::pop_front
//////////////////////////////////////////////////////////////////////

/* Compile options needed:-GX
*/

#include <iostream>
#include <deque>

using namespace std;


typedef deque<int >  INTDEQUE;
void printcontents (INTDEQUE  deque);

void main()
{

    INTDEQUE  dequetest;

    dequetest.push_front(1);
    dequetest.push_front(2);
    dequetest.push_front(3);
    printcontents (dequetest);
    dequetest.pop_front();
    printcontents (dequetest);
    dequetest.pop_front();
    printcontents (dequetest);
}

//function to print the contents of deque
void printcontents (INTDEQUE  deque)
{
    INTDEQUE::iterator pdeque;

    cout <<"The output is:"<<endl;

        for(pdeque = deque.begin();
        pdeque != deque.end();
        pdeque++)
    {
        cout << *pdeque <<endl ;
    }
}


 

Program Output is:

The output is:
3
2
1
The output is:
2
1
The output is:
1