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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../cpp/../cpp/container/list/pop_front.html below:

std::list<T,Allocator>::pop_front - cppreference.com

void pop_front();

Removes the first element of the container.

If empty() is true, the behavior is undefined.

If empty() is true:

• If the implementation is hardened, a contract violation occurs. Moreover, if the contract-violation handler returns under “observe” evaluation semantic, the behavior is undefined.
• If the implementation is not hardened, the behavior is undefined.

References and iterators to the erased element are invalidated.

Constant.

#include <list>
#include <iostream>
 
int main()
{
    std::list<char> chars{'A', 'B', 'C', 'D'};
 
    for (; !chars.empty(); chars.pop_front())
        std::cout << "chars.front(): '" << chars.front() << "'\n";
}

Output:

chars.front(): 'A'
chars.front(): 'B'
chars.front(): 'C'
chars.front(): 'D'

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