//--------------------------------------------------------------------------
// Header file
#ifndef _CIRCULAR_LIST_H_
#define _CIRCULAR_LIST_H_

#include <string>

class Circular_List
{
private:
    class Element;
public:
  Circular_List() : entry(nullptr) {}
  ~Circular_List();

  Circular_List(Circular_List const&) = delete;
  Circular_List& operator=(Circular_List const&) = delete;

  void insert(std::string const& str);
  void print() const;

  class Iterator
  {
  public:
    Iterator(Element* e) : pos(e) {}
    ~Iterator() = default;
    Iterator(Iterator const&) = default;
    Iterator& operator=(Iterator const&) = default;
    bool operator!=(Iterator const& i) { return pos != i.pos; }
    operator bool() { return pos != nullptr; }
    Iterator& operator++() { pos = pos->next; return *this;}
    std::string operator*() { return pos->name; }
  private:
    Element* pos;
  };

  Iterator begin() const { return Iterator(entry ? entry->next : nullptr); }
  Iterator end() const { return Iterator(nullptr); }
  
private:  
  class Element
  {
  public:
    Element(std::string const& s, Element* e = nullptr) : name(s), next(e) {}
    ~Element() { delete next; }
    
    Element(Element&) = delete;
    Element& operator=(Element const&) = delete;
    
    std::string name;
    Element* next;
  };

  Element* entry;
};

#endif


//--------------------------------------------------------------------------
// Implementation file
#include <iostream>

Circular_List::~Circular_List()
{
}

void Circular_List::insert(std::string const& str)
{
}

void Circular_List::print() const
{
}


//--------------------------------------------------------------------------
// Main program
#include <iostream>

using namespace std;

int main()
{
  Circular_List l;
  string name;

  cout << "Skriv in namn för spelare, avsluta med Ctrl-D." << endl;  
  cout << "Namn? ";
  
  while ( cin >> name )
  {
    l.insert(name);
    cout << "Listans innehåll:" << endl;
    l.print();
    cout << endl << "Namn? ";
  }
  cout << endl;
  
  cout << "Tjugo stegningar i listan:" << endl;
  int j = 0;
  for (Circular_List::Iterator i = l.begin(); i != l.end() && j < 20; ++i, ++j)
  {
    cout << *i << "->";
  }
  cout << endl;
  
  return 0;
}