std::list<T,Allocator>::pop_front

(constexpr since C++26)

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

(until C++26)

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.

(since C++26)

#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";
}

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

removes the last element
(public member function) [edit]

inserts an element to the beginning
(public member function) [edit]

access the first element
(public member function) [edit]