组合模式-c++

#include <iostream>
#include <string>
#include <list>
using namespace std;

class Component
{
protected:
    string name;
public:
    Component(string name)
        :name(name)
    {   }
    virtual void AddComponent(Component *component) {   }
    virtual void RemoveComponent(Component *component) {   }
    virtual void GetChild(int depth) { }
};

class Leaf : public Component
{
public:
    Leaf(string name)
        :Component(name)
    {   }
    void AddComponent(Component *component)
    {
        cout << "can't add" << endl;
    }
    void RemoveComponent(Component *component)
    {
        cout << "can't remove" << endl;
    }
    void GetChild(int depth)
    {
        string _tmpstring(depth, '-');
        cout << _tmpstring << name << endl;
    }
};

class Composite :public Component
{
private:
    list<Component*> _componets;

public:
    Composite(string name)
        :Component(name)
    { }
    void AddComponent(Component *component)
    {
        _componets.push_back(component);
    }
    void RemoveComponent(Component *component)
    {
        _componets.remove(component);
    }
    void GetChild(int depth)
    {
        string tmpstring(depth, '-');
        cout << tmpstring << name << endl;
        list<Component*>::iterator iter = _componets.begin();
        for (; iter != _componets.end(); iter++)
        {
            (*iter)->GetChild(depth + 2);
        }
    }
};

int main()
{
    Composite *root = new Composite("root");
    Leaf *leaf1 = new Leaf("A");
    Leaf *leaf2 = new Leaf("B");
    root->AddComponent(leaf1);
    root->AddComponent(leaf2);

    Composite *lay2 = new Composite("AA");
    Leaf *leaf4 = new Leaf("BB");
    lay2->AddComponent(leaf4);

    Composite *lay1 = new Composite("CC");
    Leaf *leaf3 = new Leaf("C");
    lay1->AddComponent(leaf3);
    lay1->AddComponent(lay2);

    root->AddComponent(lay1);

    root->GetChild(1);
    cout << endl;
    lay1->GetChild(1);
    cout << endl;
    lay2->GetChild(1);

    delete root;
    delete lay1;
    delete lay2;
    delete leaf1;
    delete leaf2;
    delete leaf3;
    delete leaf4;
}