About this:
>
There is no other container where getting an end iterator and
inserting an element into the end of the container would *ever* leave
that end iterator to be pointing to something valid. Not `list`, not
`deque`
https://godbolt.org/z/ndePjE9c6It works for deque. Its possible
#include <deque>
#include <iostream>
int main() {
std::deque<int> v;
v.push_back(0);
for (int i = 0; i < 999; ++i) {
auto b = std::prev(v.end());
auto e = v.end();
v.push_back(i);
++b;
if (b == e)
std::cout << "yes" << std::endl;
else
std::cout << "no" << std::endl;
}
}