#include <iostream>
#include <vector>
using namespace std;

class Component {
public:
 virtual void Operation() { }

 virtual void Add(const Component& com) { }

 virtual void Remove(const Component& com) { }

 virtual Component* GetChild(int index) {
 return 0;
 }

 virtual ~Component() { }
};

class Composite :public Component {
public:
 void Add(Component* com) {
 _coms.push_back(com);
 }

 void Operation() {
 for (auto com : _coms)
 com->Operation();
 }

 void Remove(Component* com) {
 //_coms.erase(&com);
 }

 Component* GetChild(int index) {
 return _coms[index];
 }

private:
 std::vector<Component*> _coms;
};

class Leaf :public Component {
public:
 void Operation() {
 cout << "Leaf::Operation..." << endl;
 }
};


int main() {
 Leaf *leaf = new Leaf();
 leaf->Operation();
 Composite *com = new Composite();
 com->Add(leaf);
 com->Operation();
 Component *leaf_ = com->GetChild(0);
 leaf_->Operation();

 delete leaf;
 delete com;

 return 0;
}