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#ifndef GUARD_LINKEDLIST_H_INCLUDE
#define GUARD_LINKEDLIST_H_INCLUDE

#include <linkedlist/linkedlist-config.h>

class LINKEDLIST_EXPORT LinkedList {
    //
    //
    //
    //
    /*  DEFINITIONS    ----------------------------------------------------- */

public:

    /*  DEFINITIONS    ===================================================== */
    //
    //
    //
    //
    /*  DATA    ------------------------------------------------------------ */

private:

    LinkedList * previous_; 
    LinkedList * next_; 
    /*  DATA    ============================================================ */
    //
    //
    //
    //
    /*  FUNCTIONS    ------------------------------------------------------- */


public:

    explicit LinkedList ();

    virtual
    ~LinkedList ();

    int
    lNextCount ();

    LinkedList *
    lExtract(
            LinkedList * first_item);

    LinkedList *
    lPrevious() {
        return previous_;
    }

    LinkedList *
    lNext() {
        return next_;
    }

public:

    static LinkedList *
    lPushFront (
            LinkedList * first_item,
            LinkedList * new_item);

    static LinkedList *
    lPushBack (
            LinkedList * first_item,
            LinkedList * new_item);

    static inline LinkedList *
    preppend  (
            LinkedList * first_item,
            LinkedList * new_item) {
        return lPushFront (first_item, new_item);
    }

    static inline LinkedList *
    append (
            LinkedList * first_item,
            LinkedList * new_item) {
        return lPushBack (first_item, new_item);
    }

    static LinkedList *
    lPopFront (
            LinkedList * first_item);

    static LinkedList *
    lPopBack (
            LinkedList * first_item);

    static int
    lCount (
            LinkedList * first_item) {
        if (first_item == NULL) return 0;
        else return first_item->lNextCount();
    }

    static LinkedList *
    lClear (
            LinkedList * first_item);

    static LinkedList *
    lItem (
            LinkedList * first_item,
            int index);

    static LinkedList *
    lFirst (
            LinkedList * first_item) {
        return first_item;
    }

    static LinkedList *
    lLast (
            LinkedList * first_item);


}; // class LinkedList

#endif // GUARD_LINKEDLIST_H_INCLUDE