// iterator invalidation
// Mikhail Nesterenko
// 5/9/2016

#include <iostream>
#include <vector>
using std::vector; using std::cout;

int main(){

   vector<int> v(5);
   vector<int>::iterator p;
   p = v.begin()+3;    // p points to 4th element
   v.erase(v.begin()); // erasing the first element of the vector
                       // this invalidates p
   cout << *p;         // p is invalidated, result is unspecified
                       // run-time error

}