C++树的实现

STL里面没有提供容器树的模板实现，自已写一个：
Tree.h

//tree.h 头文件 #include <list> #include <algorithm> using namespace std; struct TreeNode; //定义一个结构体原型 classTree; //定义一个类原型 classIterator; //定义一个类原型 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; }