#include<iostream>
#include<assert.h>
typedef int Datatype;
using namespace std;
struct LinkNode
{
Datatype _data;
LinkNode* _next;
LinkNode(const Datatype&x)
:_data(x)
, _next(NULL)
{}
};
class Slist
{
public:
Slist()
:_head(NULL)
, _tail(NULL)
{}
~Slist()
{
Destory();
}
Slist(const Slist&s)
:_head(NULL)
, _tail(NULL)
{
if (s._head == NULL)
{
return;
}
LinkNode*begin = s._head;
do
{
this->PushBack(begin->_data);
begin = begin->_next;
} while (begin != s._head);
}
void Swap(Slist&s)
{
swap(_head, s._head);
swap(_tail, s._tail);
}
Slist& operator=(const Slist&s)
{
if (&s != this)
{
Slist tmp(s);
Swap(tmp);
}
return *this;
}
public:
void Destory()
{
if (_head == NULL)
{
return;
}
LinkNode* begin = _head;
do{
LinkNode*del = begin;
begin = begin->_next;
delete del;
} while (begin != _head);
_head = NULL;
_tail = NULL;
}
void Print()
{
if (_head == NULL)
{
return;
}
LinkNode* begin = _head;
do{
cout << begin->_data << "->";
begin = begin->_next;
} while (begin != _head);
cout << endl;
}
void PushBack(const Datatype&x)
{
if (_head == NULL)
{
_head = new LinkNode(x);
_tail = _head;
_tail->_next = _head;
}
else
{
_tail->_next = new LinkNode(x);
_tail = _tail->_next;
_tail->_next = _head;
}
}
void PopBack()
{
if (_head == NULL)
{
return;
}
else if (_head == _tail)
{
delete _head;
_head = NULL;
_tail = NULL;
}
else
{
LinkNode* prev = _head;
while (prev->_next != _tail)
{
prev = prev->_next;
}
prev->_next = _head;
delete _tail;
_tail = prev;
}
}
void PushFront(const Datatype&x)
{
if (_head == NULL)
{
_head = new LinkNode(x);
_tail = _head;
_tail->_next = _head;
}
else
{
LinkNode* tmp = new LinkNode(x);
tmp->_next = _head;
_head = tmp;
_tail->_next = _head;
}
}
void PopFront()
{
if (_head == NULL)
{
return;
}
else if (_head == _tail)
{
delete _head;
_head = NULL;
_tail = NULL;
}
else
{
LinkNode*del = _head;
_head = _head->_next;
delete del;
_tail->_next = _head;
}
}
LinkNode* Find(Datatype x)
{
LinkNode* begin = _head;
while (begin)
{
if (begin->_data == x)
{
return begin;
}
begin = begin->_next;
if (begin == _head)
{
break;
}
}
return NULL;
}
bool Remove(LinkNode*n)
{
assert(n);
if (_head == NULL)
{
return false;
}
if (_head = _tail)
{
if (n == _head)
{
delete _head;
_head = NULL;
_tail = NULL;
return true;
}
return false;
}
LinkNode* prev = _head;
while (prev->_next != n)
{
prev = prev->_next;
if (prev == _head)
{
return false;
}
}
if (n == _head)
{
_head = _head->_next;
delete n;
_tail->_next = _head;
}
else if (n = _tail)
{
prev->_next = _head;
_tail = prev;
delete n;
}
else
{
prev->_next = n->_next;
delete n;
}
return true;
}
void Reverse()
{
if (_head ==NULL)
{
return;
}
LinkNode*newHead = NULL;
LinkNode*newTail = _head;
LinkNode*begin = _head;
while (1)
{
LinkNode*tmp = begin;
begin = begin->_next;
tmp->_next = newHead;
newHead = tmp;
if (begin == _head)
{
break;
}
}
_head = newHead;
_tail = newTail;
_tail->_next = _head;
}
private:
LinkNode* _head;
LinkNode* _tail;
};
void Test1()
{
Slist s1;
s1.PushBack(1);
s1.PushBack(2);
s1.PushBack(3);
s1.PushBack(4);
s1.PushBack(5);
s1.PushBack(6);
s1.Print();
s1.PopBack();
s1.PopBack();
s1.Print();
}
void Test2()
{
Slist s2;
s2.PushFront(1);
s2.PushFront(2);
s2.PushFront(3);
s2.PushFront(4);
s2.PushFront(6);
s2.Print();
s2.PopFront();
s2.PopFront();
s2.Print();
}
void Test3()
{
Slist s3;
s3.PushBack(1);
s3.PushBack(2);
s3.PushBack(3);
s3.PushBack(4);
s3.PushBack(5);
s3.PushBack(6);
s3.Print();
LinkNode*ret = s3.Find(5);
cout << "ret:" << ret->_data << endl;
ret = s3.Find(7);
cout << "ret:" << ret << endl;
}
void Test4()
{
Slist s5;
s5.PushBack(1);
s5.PushBack(2);
s5.PushBack(3);
s5.PushBack(4);
s5.PushBack(5);
s5.PushBack(6);
s5.Print();
Slist s2;
s2 = s5;
s2.Print();
s2.Reverse();
s2.Print();
}
int main()
{
//Test1();
//Test2();
//Test3();
Test4();
return 0;
}
