C++ 模板双向不循环链表！！
CTDChain<T,sort,equal,pointer> * nodeTemp = NULL;
------------------------------------------------------------------------------
using namespace std;
//双向不循环链表
//sort 指示是否有序
//equal 指示当出现相同节点时的处理方法
//pointer 指示是否是一个指针类型，在析构时必不可少
template <class T,
const int sort = 0,
const CtEqualMethod equal = CtEM_ALLOW,
const int pointer = 1>
--------------------------------------------------------------------------------------
class CTDChain
{
public:
CTDChain * m_pPrev;
CTDChain * m_pNext;
T m_tItem;
protected:
// 向链表头搜索一个节点, 失败时返回空指针，direct指示搜索方向
virtual CTDChain * SearchPrev(T &item)
{
if( TypeComp(m_tItem,item, CtCS_EQ) ) return this;
else if( m_pPrev )
return m_pPrev->CTDChain<T,sort,equal,pointer>:: SearchPrev(item);
else return NULL;
}
// 向链表尾部搜索一个节点, 失败时返回空指针，direct指示搜索方向
virtual CTDChain * SearchNext(T &item)
{
if( TypeComp(m_tItem,item, CtCS_EQ) ) return this;
else if( m_pNext )
return m_pNext->CTDChain<T,sort,equal,pointer>:: SearchNext(item);
else return NULL;
}
//从本节点开始向后查找最小的节点，由排序函调用
virtual CTDChain * SmallestNext()
{
CTDChain<T,sort,equal,pointer> * nodeNext = m_pNext;
CTDChain<T,sort,equal,pointer> * nodeSmall = this;
while( nodeNext )
{
if( nodeSmall->m_tItem > nodeNext->m_tItem ) nodeSmall = nodeNext;
nodeNext = nodeNext->m_pNext;
}
return nodeSmall;
}
public:
CTDChain(): m_pPrev(0), m_pNext(0), m_tItem(0){};
CTDChain(T &item): m_pPrev(0), m_pNext(0), m_tItem(0)
{
CTDChain<T,sort,equal,pointer>:: SetNodeItem(item);
}
//考贝构造函数
CTDChain(CTDChain & node)
{
m_pPrev = node.m_pPrev;
m_pNext = node.m_nNext;
if( pointer )
{
if( !m_tItem ) m_tItem = new T;
*m_tItem = *(node.nodeItem);
}
else m_tItem = node.nodeItem;
}
//析构时自动删除在它后面的节点
~CTDChain()
{
if( pointer && m_tItem ) delete m_tItem;
if( m_pPrev ) m_pPrev->m_pNext = NULL;
if( m_pNext )
{
m_pNext->m_pPrev = NULL;
delete m_pNext;
m_pNext = NULL;
}
}
// 找到链表头节点
CTDChain * Head()
{
if( !m_pPrev ) return this;
else return m_pPrev->CTDChain<T,sort,equal,pointer>:: Head();
}
// 找到链表尾节点
CTDChain * Tail()
{
if( !m_pNext ) return this;
else return m_pNext->CTDChain<T,sort,equal,pointer>:: Tail();
}
//统计链表中节点个数
int NodeNum()
{
int nNum = 0;
CTDChain<T,sort,equal,pointer> * nodeTemp = Head();
while( nodeTemp )
{
nNum++;
nodeTemp = nodeTemp->m_pNext;
}
return nNum;
}
//从链表中移走一个节点
//注意：Pop头节点时，要有指针记录新的头节点
virtual void Pop()
{
if( m_pPrev ) m_pPrev->m_pNext = m_pNext;
if( m_pNext ) m_pNext->m_pPrev = m_pPrev;
m_pPrev = m_pNext = NULL;
}
//设置一个节点的值，替换掉原有的值
virtual int SetNodeItem(const T &item)
{
if( pointer && m_tItem ) delete m_tItem;
m_tItem = item;
return CtRC_REPLACE;
}
int TypeComp(const T &a, const T&b, CtCompartStyle style = CtCS_GT)
{
if( pointer )
{
switch( style )
{
case CtCS_GT: return ((*a) > (*b)); break;
case CtCS_GE: return ((*a) >= (*b)); break;
case CtCS_EQ: return ((*a) == (*b)); break;
case CtCS_NE: return ((*a) != (*b)); break;
case CtCS_LT: return ((*a) < (*b)); break;
case CtCS_LE: return ((*a) <= (*b)); break;
default: return 0;
}
}
else
{
switch( style )
{
case CtCS_GT: return (a > b); break;
case CtCS_GE: return (a >= b); break;
case CtCS_EQ: return (a == b); break;
case CtCS_NE: return (a != b); break;
case CtCS_LT: return (a < b); break;
case CtCS_LE: return (a <= b); break;
default: return 0;
}
}
return 1;
}
// 搜索一个节点, 失败时返回空指针
virtual CTDChain * Search(T &item)
{
CTDChain<T,sort,equal,pointer> * nodeTemp = NULL;
if( TypeComp(m_tItem,item,CtCS_EQ) ) return this;
if( sort )
{//有序
if( TypeComp(item,m_tItem) ) nodeTemp = CTDChain<T,sort,equal,pointer>:: SearchNext(item);
else nodeTemp = CTDChain<T,sort,equal,pointer>:: SearchPrev(item);
}
else
{//无序
nodeTemp = CTDChain<T,sort,equal,pointer>:: SearchPrev(item);
if( !nodeTemp ) nodeTemp = CTDChain<T,sort,equal,pointer>:: SearchNext(item);
}
return nodeTemp;
}
//插入一个节点在本节点之前，node必须是一个单节点
virtual int PushPrev(CTDChain * node)
{
node->m_pNext = this;
node->m_pPrev = m_pPrev;
if( m_pPrev ) m_pPrev->m_pNext = node;
m_pPrev = node;
return CtRC_SUCCESS;
}
//插入一个节点在本节点之后，node必须是一个单节点
virtual int PushNext(CTDChain * node)
{
node->m_pNext = m_pNext;
node->m_pPrev = this;
if( m_pNext ) m_pNext->m_pPrev = node;
m_pNext = node;
return CtRC_SUCCESS;
}
//插入一个单节点
virtual int Push(CTDChain * &node)
{
CTDChain<T,sort,equal,pointer> * nodeTemp;
if( !node ) return CtRC_FAIL;
//判断相同节点
switch( equal )
{
case CtEM_REJECT: //不允许出现相同节点
case CtEM_REPLACE: //替换相同节点
nodeTemp = CTDChain<T,sort,equal,pointer>:: Search(node->m_tItem);
if( NULL == nodeTemp ) break;
if( equal == CtEM_REJECT ) return CtRC_REJECT;
return nodeTemp->CTDChain<T,sort,equal,pointer>:: SetNodeItem(node->m_tItem);
break;
case CtEM_ALLOW: //允许出现相同节点
default:
break;
}
//查找插入点，这里不用考虑相等情况
nodeTemp = this;
if( sort )
{//有序
if( TypeComp(node->m_tItem,nodeTemp->m_tItem) )
{//向表尾查找
while( TypeComp(node->m_tItem,nodeTemp->m_tItem) )
{
if( !nodeTemp->m_pNext ) break;
nodeTemp = nodeTemp->m_pNext;
}
}
else
{//向表头查找
while( TypeComp(nodeTemp->m_tItem,node->m_tItem) )
{
if( !nodeTemp->m_pPrev )
return nodeTemp->CTDChain<T,sort,equal,pointer>:: PushPrev(node);
nodeTemp = nodeTemp->m_pPrev;
}
}
}
else
{//无序
nodeTemp = CTDChain<T,sort,equal,pointer>:: Tail();
}
//在上面还有一个插入点，是插入在链表的头部
return nodeTemp->CTDChain<T,sort,equal,pointer>:: PushNext(node);
}
virtual int Push(T &item)
{
CTDChain<T,sort,equal,pointer> * nodeTemp;
int nRet;
if( NULL == (nodeTemp = new CTDChain<T,sort,equal,pointer>(item)) )
{
RAISE_ERROR("警告：申请内存失败");
return CtRC_FAIL;
}
nRet = CTDChain<T,sort,equal,pointer>:: Push(nodeTemp);
switch( nRet )
{
case CtRC_FAIL: break;
case CtRC_SUCCESS: break;
case CtRC_REPLACE:
if( pointer ) nodeTemp->m_tItem = NULL;
case CtRC_REJECT:
delete nodeTemp;
break;
default: break;
}
return nRet;
}
//插入另外一个链表的所有节点，返回值是插入节点的个数
//插入完成后，原链表被删除
virtual int Merge(CTDChain * &chain)
{
CTDChain<T,sort,equal,pointer> * nodeTemp;
int nRet, nNum = 0;
if( !chain ) return 0;
//先截断原链表
if( chain->m_pPrev )
{
chain->m_pPrev->m_pNext = NULL;
chain->m_pPrev = NULL;
}
//如果允许相同节点且无序
if( equal == CtEM_ALLOW && !sort )
{
nNum = chain->NodeNum();
nodeTemp = CTDChain<T,sort,equal,pointer>:: Tail();
nodeTemp->m_pNext = chain;
chain->m_pPrev = nodeTemp;
}
else
{
nodeTemp = chain;
while( nodeTemp )
{
chain = chain->m_pNext;
nodeTemp->Pop();
nRet = CTDChain<T,sort,equal,pointer>:: Push(nodeTemp);
switch( nRet )
{
case CtRC_SUCCESS: nNum++; break;
case CtRC_REPLACE:
if( pointer ) nodeTemp->m_tItem = NULL;
case CtRC_REJECT:
case CtRC_FAIL:
delete nodeTemp;
break;
default: break;
}
nodeTemp = chain;
}
}
chain = NULL;
return nNum;
}
//排序函数, 它使用T的操作符 '>'
virtual void Sort()
{
CTDChain<T,sort,equal,pointer> * nodeSmall;
CTDChain<T,sort,equal,pointer> * nodeTemp = CTDChain<T,sort,equal,pointer>:: Head();
while( nodeTemp )
{
nodeSmall = nodeTemp->CTDChain<T,sort,equal,pointer>:: SmallestNext();
if( nodeSmall != nodeTemp )
{//最小节点不是当前节点
nodeSmall->CTDChain<T,sort,equal,pointer>:: Pop();
nodeTemp->CTDChain<T,sort,equal,pointer>:: PushPrev(nodeSmall);
}
else nodeTemp = nodeTemp->m_pNext;
}
}
---------------------------------->人生犹如负重致远，不可急于求成。
自律使人自由！
