C++的组合(Composite)模式

现欲构造一个文件/目录树，采用组合(Composite)设计模式来设计，得到的类图如下：
C++代码为：
 1 #include <list>
 2 #include <iostream>
 3 #include <string>
 4 
 5  using namespace std;
 6 
 7  class AbstractFile {
 8 protected:
 9     string name;   /*文件或目录名*/
10 public:
11     void printName() {cout<<name<<endl;}    /*打印文件或目录名称*/
12     virtual void addChild(AbstractFile *file)=0;  /*给一个目录增加子目录或文件*/
13     virtual void removeChild(AbstractFile *file)=0;  /*删除一个目录的子目录或文件*/
14     virtual list<AbstractFile *> *getChildren()=0;   /*保存一个目录的子目录或文件*/
15 };
16 
17 class File:public AbstractFile{
18 public:
19     File(string name) {this->name=name;}
20     void addChild(AbstractFile *file) {return;}
21     void removeChild(AbstractFile *file) {return;}
22     list<AbstractFile *> *getChildren() {return NULL;}
23 };
24 
25 class Folder:public AbstractFile {
26 private:
27     list<AbstractFile *> childList;   /*存储子目录或文件*/
28 public:
29     Folder(string name) {this->name=name;}
30     void addChild(AbstractFile *file) {childList.push_back(file);}
31     void removeChild(AbstractFile *file) {childList.remove(file);}
32     list<AbstractFile *> *getChildren() {return &childList;}
33 };
34 
35 int main() {
36     AbstractFile *rootFolder=new Folder("c:\\");
37     AbstractFile *compositeFolder=new Folder("composite");
38     AbstractFile *WindowsFolder=new Folder("Windows");
39     AbstractFile *file=new File("TestComposite.C++");
40     rootFolder->addChild(compositeFolder);
41     rootFolder->addChild(WindowsFolder);
42     compositeFolder->addChild(file);
43     rootFolder->printName();
44     compositeFolder->printName();
45     WindowsFolder->printName();
46     file->printName();
47     return 0;
48 }