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Showing content from https://cplusplus.com/reference/deque/deque/pop_front/ below:

public member function

<deque>

std::deque::pop_front

Delete first element

Removes the first element in the deque container, effectively reducing its size by one.

This destroys the removed element.



Parameters none

Return value none

Example 
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// deque::pop_front
#include <iostream>
#include <deque>

int main ()
{
  std::deque<int> mydeque;

  mydeque.push_back (100);
  mydeque.push_back (200);
  mydeque.push_back (300);

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

  std::cout << "\nThe final size of mydeque is " << int(mydeque.size()) << '\n';

  return 0;
}
Output: 
Popping out the elements in mydeque: 100 200 300
The final size of mydeque is 0


Complexity Constant.

Iterator validity The iterators, pointers and references referring to the removed element are invalidated.
Iterators, pointers and references referring to other elements that have not been removed are guaranteed to keep referring to the same elements they were referring to before the call.

Data races The container is modified.
The first element is modified. Concurrently accessing or modifying other elements is safe (although see iterator validity above).

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

See also
deque::pop_back
Delete last element (public member function)
deque::push_front
Insert element at beginning (public member function)
deque::erase
Erase elements (public member function)

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