class BuddyList
{
 public:
  BuddyList();

  //
  // Adds buddy as a friend of name.
  //
  void addBuddy(const string& name, const string& buddy);

  //
  // Removes buddy as a friend of name
  //
  void removeBuddy(const string& name, const string& buddy);

  //
  // Returns true if buddy is a friend of name.
  // Otherwise returns false.
  //
  bool isBuddy(const string& name, const string& buddy) const;

  //
  // Retrieves a list of all the friends of name.
  //
  list getBuddies(const string& name) const;

 protected:
  multimap mBuddies;
 private:
  // prevent assignment and pass-by-value
  BuddyList(const BuddyList& src);
  BuddyList& operator=(const BuddyList& rhs);
};