public member function
<forward_list>

std::forward_list::pop_front

void pop_front();
Delete first element
Removes the first element in the forward_list container, effectively reducing its size by one.

This destroys the removed element.

Parameters

none

Return value

none

Example

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// forward_list::pop_front
#include <iostream>
#include <forward_list>

int main ()
{
  std::forward_list<int> mylist = {10, 20, 30, 40};

  std::cout << "Popping out the elements in mylist:";
  while (!mylist.empty())
  {
    std::cout << ' ' << mylist.front();
    mylist.pop_front();
  }

  std::cout << '\n';

  return 0;
}

Output:
Popping out the elements in mylist: 10 20 30 40

Complexity

Constant.

Iterator validity

Iterators, pointers and references referring to element removed by the function are invalidated.
All other iterators, pointers and reference keep their validity.

Data races

The container is modified.
The first element is modified. Concurrently accessing or modifying other elements is safe.

Exception safety

If the container is not empty, the function never throws exceptions (no-throw guarantee).
Otherwise, it causes undefined behavior.

See also

  • 9316991614 2018-02-25
  • 191841613 2018-02-25
  • 16411612 2018-02-25
  • 6081981611 2018-02-25
  • 1784561610 2018-02-25
  • 4651609 2018-02-25
  • 9348111608 2018-02-25
  • 2513771607 2018-02-25
  • 6478461606 2018-02-24
  • 4985791605 2018-02-24
  • 5637141604 2018-02-24
  • 282181603 2018-02-24
  • 6217941602 2018-02-24
  • 5076141601 2018-02-24
  • 714281600 2018-02-24
  • 6607141599 2018-02-24
  • 949041598 2018-02-24
  • 6809961597 2018-02-24
  • 671871596 2018-02-24
  • 7107821595 2018-02-24