#ifndef CPPLISTS_H_
#define CPPLISTS_H_

namespace CppLists
{
    struct List;
    struct Node
    {
        Node* next;
        int data;
        Node* prev;
    };

    struct List
    {
    List(List& myList);
        Node* first;
        Node* last;
        int size;
    };

}


#endif /* CPPLISTS_H_ */
_______________________________________________

#include "CppLists.h"

#define NULL 0

void CppLists::List(List& myList)
{
    myList.size = 0;
    myList.first = NULL;
    myList.last = NULL;
}