Thread: "NULL" iterator?

I have some code which is using std::map iterators in a manner similar to pointers. I have a wrapper class around the iterator which facilitates pulling elements out of them. The problem is, when I compile, I get the error "no appropriate default constructor available".

Code:

typedef std::map<int, int> foo;

class FooElem
{
  foo::const_iterator ci;
  
  public:
    FooElem (foo::const_iterator const & iter) : ci(iter) { }

    std::string getId() { return ci->first; }
    int getAge() { return ci->second; }
};

So, what I want to do is add a constructor like this...

Code:

    FooElem() : ci(NULL?) { }

But... that clearly won't work. What can I do to get this effect? The best I can think of is to use a pointer to the iterator, but it seems like there should be a way to just make a zero-iterator or something.