<code C++>
#ifndef LIST_H
#define LIST_H

#include <string>

using namespace std;

class Item;

class List
{  
private:
    Item * first;
    Item * last;

public:
    Item * getFirst () { return first; }
    Item * getLast () { return last; }

public:
    List (); // konstruktor
    ~ List (); // destruktor

    void insertFirst (string name0);
    void insertLast (string name0);

    void linkFirst (Item * p);
    void linkLast (Item * p);

    void linkBefore (Item * old, Item * p); // vloz p pred old
    void linkAfter (Item * old, Item * p); // vloz p za old

    void unlink (Item * p); // odpoj p ze seznamu

    void print ();
    void insert (string name0);
    void move (List & target); // presunout vsechny prvky z this do target
    void reverse ();

private:
    void link (Item * a, Item * b, Item * c); // pripoj b v poradi a, b, c
    // b novy, zatim neni v senamu
    // a predchudce, muze byt nulovy
    // c naslednik, muze byt nulovy
};

class Item
{
private:
    string name;
    List * owner;
    Item * prev;
    Item * next;
public:
    string getName () { return name; }
    Item * getPrev () { return prev; }
    Item * getNext () { return next; }
public:
    Item (string name0 = "");
    friend class List;
};

#endif // LIST_H

</code>

<code C++>
#include "list.h"

// #include <assert.h>
#include <cassert>

#include <iostream>

using namespace std;

List::List() :
    first (nullptr),
    last (nullptr)
{
}

Item::Item (string name0) :
    name (name0),
    owner (nullptr),
    prev (nullptr),
    next (nullptr)
{
}

void List::insertFirst (string name0)
{
    linkFirst ( new Item (name0) );
}

void List::insertLast (string name0)
{
    // Item * p = new Item;
    // p->name = name0;
    Item * p = new Item (name0);
    linkLast (p);
}

void List::linkFirst(Item *p)
{
    link (nullptr, p, first);
}

void List::linkLast(Item *p)
{
    link (last, p, nullptr);
}

void List::linkBefore (Item *old, Item *p)
// vloz p pred old
{
    assert (old != nullptr);
    link (old->prev, p, old);
}

void List::linkAfter(Item *old, Item *p)
// vloz p za old
{
    assert (old != nullptr);
    link (old, p, old->next);
}

void List::link(Item *a, Item *b, Item *c)
{
    // #include <cassert>
    assert (b != nullptr);

    assert (b->owner == nullptr);
    b->owner = this;

    assert (a == nullptr || a->owner == this);
    assert (c == nullptr || c->owner == this);

    b->prev = a;
    b->next = c;

    if (a != nullptr)
       a->next = b;
    else
       first = b;

    if (c != nullptr)
       c->prev = b;
    else
       last = b;
}

void List::unlink (Item *p)
{
    assert (p != nullptr);
    assert (p->owner == this);

    Item * a = p->prev;
    Item * c = p->next;

    if (a != nullptr)
       a->next = c; // mame predchudce, muzeme propojit
    else
       first = c; // nemame predchudce, naslednik se stava prvnim

    if (c != nullptr)
       c->prev = a;
    else
       last = a;

    p->owner = nullptr;
    p->prev = nullptr;
    p->next = nullptr;
}

List::~List()
{
   Item * p = first;
   while (p != nullptr)
   {
       Item * t = p->next;
       unlink (p);
       delete p;
       p = t;
   }
}

void List::move (List & target)
{
    Item * p = first;
    while (p != nullptr)
    {
        Item * t = p->next;
        unlink (p);
        target.linkLast (p);
        p = t;
    }
}

void List::reverse ()
{
    List target;

    Item * p = first;
    while (p != nullptr)
    {
        Item * t = p->next;
        unlink (p);
        target.linkFirst (p);
        p = t;
    }

    target.move (*this);
}

void List::print ()
{
   // #include <iostream>
   cout << "[" << endl;

   Item * p = first;
   while (p != nullptr)
   {
       cout << p->name << endl;
       p = p->next;
   }

   cout << "]" << endl << endl;
}

void List::insert (string name0)
{
    Item * t = first;
    while (t != nullptr && t->name <= name0)
        t = t->next;

    Item * p = new Item (name0);
    if (t != nullptr)
        linkBefore (t, p);
    else
        linkLast (p);
}

</code>

<code C++>
#include <iostream>
#include "list.h"

using namespace std;

int main()
{
    List a;
    a.insertFirst ("Mikes");
    a.insertLast ("Bobes");
    a.insertFirst ("Pasik");
    a.print ();

    List b;
    b.insert ("Vochumurka");
    b.insert ("Kremilek");
    b.insert ("Racochejl");
    b.print ();

    // Item * t = b.getFirst();
    // b.unlink (t);
    // a.linkFirst (t);

    a.move (b);
    a.print ();
    b.print ();

    b.reverse();
    b.print ();
    return 0;
}

</code>