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C++ List push_front Function

The C++ function std::list::push_front() inserts new element at the beginning of list and increases size of list by one.

Following is the declaration for std::list::push_front() function form std::list header.

void push_front (const value_type& val);

void push_front (const value_type& val);

val − Value of element to be inserted into list.

None.

This member function never throws exception.

Constant i.e. O(1)

The following example shows the usage of std::list::push_front() function.

#include <iostream>
#include <list>

using namespace std;

int main(void) {
   list<int> l;

   for (int i = 0; i < 5; ++i)
      l.push_front(i + 1);

   cout << "List contains following elements" << endl;

   for (auto it = l.begin(); it != l.end(); ++it)
      cout << *it << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

List contains following elements
5
4
3
2
1

list.htm

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