#include<iostream>
using namespace std;
#include<assert.h>
#include<list>
#include<vector>
template<class T>
struct  _ListNode
{
    T _data;
    _ListNode<T>* _next;
    _ListNode<T>* _prev;
    _ListNode(const T& x)
        :_data(x)
        ,_next(NULL)
        , _prev(NULL)
    {}
};
template
 
<class T,class Ref,class Ptr>
struct _ListIterator
{
    typedef _ListNode<T> Node;
    typedef _ListIterator<T, Ref, Ptr> Self;
    _ListIterator(Node *node)
        :_node(node)
    {}
    Ref operator*()
    {
        return _node->_data;
    }
    bool operator==(const Self& s) const
 

    {
        return this->_node == s._node;
    }
    Self& operator++()
    {
        _node = _node->_next;
        return *this;
    }
    Self& operator++(int)
    {
        Node* cur = _node;
        _node = _node->_next;
        return *cur;
    }
    Self& operator--()
    {
        _node = _node->_prev;
        return
 
 *this;
    }
    Self& operator--(int)
    {
        Node* cur = _node;
        _node = _node->_prev;
        return *cur;
    }
    // it != l.End() // it.operator != (&it, l.End()) 
    bool operator != (const Self& s) const
    {
        return this->_node != s._node;
    }
    Node* _node;
};
// 迭代器
template<class T>
class List
{
    typedef _ListNode<T> Node;
public:
    typedef _ListIterator<T, T&, T*> Iterator;
    typedef _ListIterator<T, const T&, const T*> ConstIterator;

    Node* GetNode(const T& x)
    {
        return new Node(x);
    }

    List()
    {
        _head = GetNode(T());
        _head->_next = _head;
        _head->_prev = _head;
    }

    Iterator Begin()
    {
        return Iterator(_head->_next);
    }

    ConstIterator Begin() const
    {
        return ConstIterator(_head->_next);
    }

    Iterator End()
    {
        return Iterator(_head);
    }

    ConstIterator End() const
    {
        return ConstIterator(_head);
    }


    void PushBack(const T& x)
    {
        Node* tail = _head->_prev;
        Node* tmp = GetNode(x);
        tail->_next = tmp;
        tmp->_prev = tail;
        tmp->_next = _head;
        _head->_prev = tmp;
    }

    void PopBack()
    {
        if (_head->_next != _head)
        {
            Node* tail = _head->_prev;
            Node* prev = tail->_prev;
            delete tail;
            prev->_next = _head;
            _head->_prev = prev;
        }
    }
    void PopFront()
    {
        if (_head->_next != _head)
        {
            Node *prev = _head->_next;
            Node *cur = prev->_next;
            delete prev;
            _head->_next = cur;
            cur->_prev = _head;
        }
    }
    void PushFront(const T& x)
    {
        Node *tmp = GetNode(x);
        Node *cur = _head->_next;
        tmp->_next = cur;
        tmp->_prev = _head;
        _head->_next = tmp;
        cur->_prev = tmp;
    }
    Iterator Find(const T& x)
    {
        if (_head->_next == _head)
            return NULL;
        else
        {
            Node *cur=_head->_next;
            while (cur != _head)
            {
                if (cur->_data == x)
                {
                    return cur;
                }
                cur = cur->_next;
            }
            return NULL;
        }
    }
    void Insert(Iterator pos,const T &x) // 指定元素前插入資料
    {
        assert(pos._node);
        Node *tmp =GetNode(x);
        Node *cur = _head->_next;
        while (cur->_next != pos._node)
        {
            cur = cur->_next;
        }
        Node* prev = cur->_next;
        tmp->_next = prev;
        tmp->_prev = cur;
        cur->_next = tmp;
        prev->_prev = tmp;
    }
    Iterator Erase(Iterator pos)
    {
        assert(pos._node);
        Node* cur = _head;
        while (cur->_next != pos._node)
        {
            cur = cur->_next;
        }
        cur->_next = pos._node->_next;
        pos._node->_next->_prev = cur;
        delete pos._node;
        pos._node = NULL;
        return pos._node;
    }
protected:
    Node* _head;
};

void PrintMyList(const List<int>& l1)
{
    // [)
    List<int>::ConstIterator it = l1.Begin();
    while (it != l1.End())
    {
        //*it = 10;
        cout << *it << " ";
        ++it;
    }
    cout << endl;
}

void TestMyList() //執行結果:0 1 2 3
{
    List<int> l1;
    l1.PushBack(1);
    l1.PushBack(2);
    l1.PushBack(3);
    l1.PushBack(4);
    l1.PushBack(5);
    l1.PushFront(0);
    l1.PopBack();
    l1.PopFront();
    l1.Insert(l1.Find(1), 0);
    l1.Erase(l1.Find(4));
    PrintMyList(l1);
}
void PrintVector(const vector<int>& v)
{
    // 普通迭代器 -- 可讀可寫
    // const 迭代器 -- 可讀
    // 反向迭代器  -- 反著遍歷
    // [begin, end)
    vector<int>::const_iterator it = v.begin();
    while (it != v.end())
    {
        /*  if (*it % 2)
        {
        cout<<*it<<" ";
        }*/
        //(*it)++;

        cout << *it << " ";

        ++it;
    }
    cout << endl;

    vector<int>::const_reverse_iterator rIt = v.rbegin();//reverse
    while (rIt != v.rend())
    {
        cout << *rIt << " ";
        ++rIt;
    }
    cout << endl;
}

void TestVector()
{
    vector<int> v1;
    v1.push_back(1);
    v1.push_back(2);
    v1.push_back(3);
    v1.push_back(4);

    PrintVector(v1);

    vector<int> v2(3, 10);
    // 型別--類似指標的一個物件 -- 智慧指標

    PrintVector(v2);
}

void PrintList(list<int>& l)
{
    list<int>::const_iterator it = l.begin();
    while (it != l.end())
    {
        cout << *it << " ";
        //*it = 10;//const迭代器，不可修改
        ++it;
    }
    cout << endl;
}

void TestList()
{
    list<int> l1;
    l1.push_back(1);
    l1.push_back(2);
    l1.push_back(3);
    l1.push_back(4);
    PrintList(l1);

    list<int> l2(5, 1);
    PrintList(l2);

}


int main()
{
    //TestList();
    TestMyList();
    system("pause");
    return 0;
}