#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;

}