void push_front ( const T& x );

Insert element at beginning

Inserts a new element at the beginning of the deque container, right before its current first element. The content of this new element is initialized to a copy of x.

This effectively increases the container size by one.

Parameters

x

Value to be copied to the new element.
T is the first template parameter (the type of the elements stored in the container).

Return value

Example

// deque::push_front
#include <iostream>
#include <deque>
using namespace std;

int main ()
{
  deque<int> mydeque (2,100);     // two ints with a value of 100
  mydeque.push_front (200);
  mydeque.push_front (300);

  cout << "mydeque contains:";
  for (unsigned i=0; i<mydeque.size(); ++i)
    cout << " " << mydeque[i];

  cout << endl;
  return 0;
}

Output:

300 200 100 100 

Complexity

See also