invaliditerator.cpp

#include <vector>
#include <iostream>
using namespace std;

int main() {

  std::vector<int> foo;
  
  // Add an item and then obtain an iterator to it
  foo.push_back(3);
  vector<int>::iterator iter = foo.begin();
  // Check the addresses of our iterator and the first item
  std::cerr << "Address of the begin() iterator: " << &iter << std::endl;
  std::cerr << "Address of our first object: " << &foo.at(0) << std::endl;
  
  
  // Add a new item and check the address of our iterator, begin()
  foo.push_back(4);
  std::cerr << "Address of the begin() iterator after adding a new item: " << &iter << std::endl;
  
  // Check the address of the first item, we expect it to be the same as our begin() iterator
  std::cerr << "Address of our first object after adding a new item: " << &foo.at(0) << std::endl;
  
  return 0;

}

// output
//
// Address of the begin() iterator: 0xbfbedb24
// Address of our first object: 0x9c0d008
// Address of the begin() iterator after adding a new item: 0xbfbedb24
// Address of our first object after adding a new item: 0x9c0d018