一般树的手工打造，遍历，求节点数和树高

 1 //一般树的手工打造，遍历，求节点数和树高 
 2 #include <cstdlib>
 3 #include <iostream>
 4 #include <vector>//使用向量需包含该文件 
 5 
 6 using namespace std;
 7   
 8 template<typename T>
 9 struct Tnode{
10 
11     typedef vector<Tnode*> CT; //特别注意向量后的<数据呈放类型>，太坑了!!! 
12     //typedef CT child_container_type；
13     typedef T Value_type;
14     CT children_;
15     T value_;
16     Tnode(T const& v=T()):value_(v){} 
17     T& value(void){return value_;}
18     void add_child(Tnode* ch){children_.push_back(ch);}
19     int degree(void) const{return children_.size();}
20     bool leafnode(void) const{return children_.empty();} 
21 };
22 
23 template<typename NT>
24 int size(NT* root){
25     if(root==0) return 0;
26     int result=1;
27     typedef typename NT::CT::iterator CI;
28     CI fc=root->children_.begin();//返回容器向量的首地址 
29     CI lc=root->children_.end();
30     for(;fc!=lc;++fc) result+=size(*fc); 
31     return result;
32     }
33     
34 template<typename NT>  
35  int height(NT* root){
36      if(root==0) return 0;
37      int max=0;
38      typedef typename NT::CT::iterator CI;
39      CI fc=root->children_.begin();
40      CI lc=root->children_.end();
41      for(;fc!=lc;++fc){
42       int h=height(*fc);
43       if(h>max) max=h;                 
44                        }
45       return max+1;
46      }   
47      
48  template<typename NT>
49  void preorder(NT* root,void(*visit)(NT*)){
50       if(root!=0){
51         visit(root);
52       typedef typename NT::CT::iterator CI;
53       CI fc=root->children_.begin();
54       CI lc=root->children_.end();
55        for(;fc!=lc;++fc)
56           preorder(*fc,visit);                                      
57                   }
58       }
59       
60   template<typename NT>
61  void postorder(NT* root,void(*visit)(NT*)){
62       if(root!=0){
63       typedef typename NT::CT::iterator CI;
64       CI fc=root->children_.begin();
65       CI lc=root->children_.end();
66        for(;fc!=lc;++fc)
67           postorder(*fc,visit);                                      
68          visit(root);        
69                   }
70       }
71       
72  //template<typename NT>
73  typedef Tnode<char> NT; 
74  void print(NT* p){std::cout<<p->value()<<"";}
75     
76 int main(int argc, char *argv[])
77 {   
78     NT e('E');NT f('F');NT b('B');
79     b.add_child(&e);b.add_child(&f);//注意怎样取模板类对象的地址
80     NT g('G');NT c('C');
81     c.add_child(&g);
82     NT d('D');NT a('A');
83     a.add_child(&b);a.add_child(&c); 
84     NT* root=&a;
85     int as=size(root);
86     int ah=height(root);
87     int ad=a.degree();
88     bool al=a.leafnode(); bool dl=d.leafnode();
89     preorder(root,&print);cout<<endl;
90     postorder(root,&print);cout<<endl;
91     
92     system("PAUSE");
93     return EXIT_SUCCESS;
94 }