c++ empty std::vector begin not equals to end

Question

Hi I have situation on windows 10, that declared empty class member variable vector, but this vector\'s begin()(first iterator) and end()(last iterator)

Answer 1

std::vector v;
assert(v.begin() == v.end());

This should work: begin and end compare equal.

On the other hand

auto b = v.begin();
auto e = v.end();
assert(&b == &e);

is prohibited from working: the two iterators are different objects and must have different addresses.

Compare the equivalent:

int i = 42;
int j = 42;
assert(i == j);   // ok
assert(&i == &j); // fail