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#ifndef _LINKEDLIST_H_
#define _LINKEDLIST_H_
#include "collection.h"
#include <string>
#include <sstream>
class LinkedList : public Collection
{
private:
class Node {
public:
Node() : v(-1), next(NULL), prev(NULL) {}
int v;
Node *next;
Node *prev;
};
public:
LinkedList();
LinkedList(const LinkedList&);
/* we can override the return type and still preserve dynamic binding! */
LinkedList& operator=(const Collection&);
~LinkedList();
virtual void add(int);
virtual bool remove(int);
virtual int operator[](const int);
virtual LinkedList *copy(void);
/* override these methods that had empty definitions in the interface */
void iterate(void (*)(int *));
bool contains(int) const;
std::string print(void) const;
protected:
private:
void print_helper(std::stringstream&, Node *) const;
void cleanup(void);
Node *head;
Node *tail;
};
#endif
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