I have the following code

// Example program
#include <iostream>
#include <string>
#include <vector>
struct Foo {
    int value = 0;
};

int main()
{
  std::vector<Foo> objs;
  for (int idx = 0; idx < 5; idx++) {
      objs.push_back(Foo{.value = idx});
      std::cout << "address: " << &(objs.back()) << "n";
  }
  
  std::cout << "=======n";
  for (const auto& obj: objs) {
      std::cout << "address: " << &(obj)<< "n";
  }
}

Now, I expect the object address are the same, but apparently they are not, see below for a screenshot.

How do I understand this? Are the objects moved/relocated internally by the std::vector class somehow?