C++树的实现 收藏
C++树的实现
STL里面没有提供容器树的模板实现,从网上找到一个:
Tree.h
//tree.h 头文件
#include <list>
#include <algorithm>
using namespace std;
struct TreeNode; //定义一个结构体原形
classTree; //定义一个类原形
classIterator; //定义一个类原形
typedef list<TreeNode*> List; //重命名一个节点链表
TreeNode* clone(TreeNode*,List&,TreeNode*);//Clone复制函数
struct TreeNode{
int_data; //数据
TreeNode* _parent; //父节点
List_children; //子节点
TreeNode(int,TreeNode*); //构造函数
void SetParent(TreeNode&); //设置父节点
void InsertChildren(TreeNode&); //插入子节点
};
classTree{
public:
//下面是构造器和运算符重载
Tree(); //默认构造函数
Tree(constTree&); //复制构造函数
Tree(constint); //带参数构造函数
Tree(constint,constlist<Tree*>&);//带参数构造函数
~Tree(); //析构函数
Tree& operator=(constTree&); //=符号运算符重载
bool operator==(constTree&); //==符号运算符重载
bool operator!=(constTree&); //!=符号运算符重载
//下面是成员函数
void Clear(); //清空
boolIsEmpty()const; //判断是否为空
intSize()const; //计算节点数目
intLeaves(); //计算叶子数
intRoot()const; //返回根元素
intHeight(); //计算树的高度
//下面是静态成员函数
static boolIsRoot(Iterator); //判断是否是根
static boolisLeaf(Iterator); //判断是否是叶子
static IteratorParent(Iterator); //返回其父节点
static intNumChildren(Iterator); //返回其子节点数目
//跌代器函数
Iteratorbegin(); //Tree Begin
Iteratorend(); //Tree End
friend classIterator; //Iterator SubClass
private:
list<TreeNode*> _nodes; //节点数组
list<TreeNode*>::iteratorLIt; //一个节点迭代器
intheight(TreeNode*);
intlevel(TreeNode*,Iterator);
};
//This is TreeSub Class Iterator
classIterator{
private:
Tree* _tree; //Tree data
list<TreeNode*>::iterator_lit; //List Iterator
public:
Iterator(); //默认构造函数
Iterator(constIterator&); //复制构造函数
Iterator(Tree*,TreeNode*); //构造函数
Iterator(Tree*,list<TreeNode*>::iterator);//构造函数
//运算符重载
void operator=(constIterator&); //赋值运算符重载
bool operator==(constIterator&); //关系运算符重载
bool operator!=(constIterator&); //关系运算符重载
Iterator& operator++(); //前缀++运算符
Iterator operator++(int); //后缀++运算符
int operator*()const; //获得节点信息
bool operator!(); //赋值运算符重载
typedef list<TreeNode*>::iteratorList;
friend classTree;
};
Tree.cpp
//tree.cpp 实现文件
#include "Tree.h"
//***** 下面是对于TreeNode结构体的定义实现*****///
TreeNode::TreeNode(inttype= 0,TreeNode* Parent = 0){
_data = type;
_parent = Parent;
}
void TreeNode::SetParent(TreeNode& node){
_parent = &node;
}
void TreeNode::InsertChildren(TreeNode& node){
TreeNode* p = &node;
_children.push_back(p);
}
//***** 下面是对于Tree类的定义实现*****///
Tree::Tree(){
}
Tree::Tree(constinttype){
_nodes.push_back(new TreeNode(type));
}
Tree::Tree(constTree& t){
if(t._nodes.empty())return;
clone(t._nodes.front(),_nodes,0);
}
Tree::Tree(constinttype,constlist<Tree*>& lit){
TreeNode* root = new TreeNode(type);//建立根节点
_nodes.push_back(root);//放入树中
list<Tree*>::const_iteratorit;
for(it = lit.begin();it!=lit.end();it++){
if(!((*it)->_nodes.empty())){//如果当前节点元素不为空
Tree* tp = newTree(**it);
TreeNode* p = tp->_nodes.front();
root->_children.push_back(p); //设置根的子节点
p->_parent = root; //设置节点的父节点为根
list<TreeNode*>::iteratorlit1 = tp->_nodes.begin();
list<TreeNode*>::iteratorlit2 = tp->_nodes.end();
list<TreeNode*>::iteratorlit3 = _nodes.end();
_nodes.insert(lit3,lit1,lit2);
}
}
}
Tree::~Tree(){
for(list<TreeNode*>::iteratorit = _nodes.begin();it!=_nodes.end();it++){
delete* it;
}
}
Tree& Tree::operator =(constTree & t){
Clear();
Tree* p = newTree(t);
_nodes = p->_nodes;
return *this;
}
boolTree::operator ==(constTree& t){
if(_nodes.size()!=t._nodes.size()){
return false;
}
list<TreeNode*>::iteratorit = _nodes.begin();
list<TreeNode*>::const_iterator_it = t._nodes.begin();
while(it!=_nodes.end()&&_it!=t._nodes.end()){
if((*it)->_data!=(*_it)->_data){
return false;
}
it++;
_it++;
}
return true;
}
boolTree::operator !=(constTree& t){
if(_nodes.size()!=_nodes.size()){
return true;
}
else{
list<TreeNode*>::iteratorit = _nodes.begin();
list<TreeNode*>::const_iterator_it = t._nodes.begin();
while(it!=_nodes.end()&&_it!=t._nodes.end()){
if((*it)->_data!=(*_it)->_data){
return true;
}
it++;
_it++;
}
return false;
}
}
void Tree::Clear(){
for(list<TreeNode*>::iteratorit = _nodes.begin();it!=_nodes.end();it++){
delete* it;
}
_nodes.clear();
}
boolTree::IsEmpty()const{
return _nodes.empty();
}
intTree::Size()const{
return (int)_nodes.size();
}
intTree::Leaves(){
inti = 0;
list<TreeNode*>::iteratorit = _nodes.begin();
while(it!=_nodes.end()){
if((*it)->_children.size()==0){
i++;
}
it++;
}
return i;
}
intTree::Height(){
if(_nodes.size()!=0){
TreeNode* TNode = _nodes.front();
return height(TNode);
}
else{
return -1; //判断为空树
}
}
intTree::height(TreeNode* node){
if(!node){
return -1;
}
else{
list<TreeNode*> plist = node->_children;
if(plist.size()==0){
return 0;
}
inthA = 0;
for(list<TreeNode*>::iteratorit = plist.begin();it!=plist.end();it++){
inthB = height(*it);
if(hB>hA){
hA = hB;
}
}
return hA+1;
}
}
IteratorTree::begin(){
return Iterator(this,_nodes.begin());
}
IteratorTree::end(){
return Iterator(this,_nodes.end());
}
intTree::Root()const{
return (*_nodes.begin())->_data;
}
boolTree::IsRoot(Iteratorit){
TreeNode p = *it;
if(p._parent == 0){
return true;
}
return false;
}
boolTree::isLeaf(Iteratorit){
TreeNode p = *it;
if(p._children.size() == 0){
return true;
}
return false;
}
IteratorTree::Parent(Iteratorit){
TreeNode p = *it;
Tree* t = it._tree;
IteratorIte(t,p._parent);
return Ite;
}
intTree::NumChildren(Iteratorit){
TreeNode p = *it;
return (int)p._children.size();
}
//***** 下面是对于Tree::Iterator类的定义实现*****///
Iterator::Iterator(){
}
Iterator::Iterator(constIterator& it){
_tree = it._tree;
_lit = it._lit;
}
Iterator::Iterator(Tree* t, TreeNode* n){
_tree = t;
list<TreeNode*>& nodes = _tree->_nodes;
_lit = find(nodes.begin(),nodes.end(),n);//<algorithm> Members
}
Iterator::Iterator(Tree * t, list<TreeNode*>::iteratorlt){
_tree = t;
_lit = lt;
}
void Iterator::operator =(constIterator& it){
_tree = it._tree;
_lit = it._lit;
}
boolIterator::operator ==(constIterator & it){
return _tree == it._tree && _lit == it._lit;
}
boolIterator::operator !=(constIterator & it){
return _tree != it._tree || _lit != it._lit;
}
Iterator& Iterator::operator ++(){
++_lit;
return *this;
}
IteratorIterator::operator ++(int){
Iteratorit(*this);
++_lit;
return it;
}
intIterator::operator *() const{
return ((*_lit)->_data);
}
boolIterator::operator !(){
return _lit == _tree->_nodes.end();
}
//Clone函数
TreeNode* clone(TreeNode* node,List& nodes,TreeNode* nodep){
TreeNode* cp = new TreeNode(node->_data,nodep);
nodes.push_back(cp);
List& l = node->_children;
List& cl = cp->_children;
for(list<TreeNode*>::iteratorlt = l.begin();lt!=l.end();lt++){
cl.push_back(clone(*lt,nodes,cp));
}
return cp;
}
本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/stephenxu111/archive/2008/05/14/2446382.aspx