Adding pointers to vector in loop

Question

I am slightly confused about the following code

void foo() {

  std::list list;

  for (int i = 0; i < 3; i ++) {
    A a = A(i);
    list.push_         


        

Answer 1

The variable a is local to the first for loop, so it is destroyed at the end of each iteration of the loop. This means that after the loop finishes, all three pointers in list point to objects that no longer exist. Dereferencing those pointers causes undefined behaviour.