：组合模式：Component

#ifndef __COMPONENT_H__
#define __COMPONENT_H__
#include <iostream>
#include <vector>
using namespace std;
class Component
{
public:
	virtual ~Component(){}
	virtual void add(Component *c) {}
	virtual void remove(Component *c) {}
	virtual Component* getChild(int i) { return NULL; }
	virtual const char* getName() { return ""; }
	virtual const char* getDescripthion() { return ""; }
	virtual float getPrice() { return 0; }
	virtual bool isVegetarian() { return false; }
	virtual void print() {}
};

class MenuItem : public virtual Component
{
private:
	const char* name;
	const char* description;
	float price;
	bool vegetarian;
public:
	MenuItem(const char* n, const char* d, bool v, float p)
	{
		name = n;
		description = d;
		price = p;
		vegetarian = v;
	}

	virtual~MenuItem(){}

	virtual const char* getName()
	{
		return name;
	}

	virtual const char* getDescripthion()
	{
		return description;
	}

	virtual float getPrice()
	{
		return price;
	}

	virtual bool isVegetarian()
	{
		return vegetarian;
	}

	virtual void print()
	{
		cout <<"Type:MenuItem, Name: "<< getName() << (isVegetarian() ? "isVe" : "NotVe") << getPrice() << getDescripthion() << endl;
	}

};

class Menu :public virtual Component
{
private:
	const char* name;
	const char* description;
	vector<Component *>menuComponent;
public:
	Menu(char* n, const char* d)
	{
		name = n;
		description = d;
	}

	virtual ~Menu()
	{

	}

	virtual void add(Component *c)
	{
		menuComponent.push_back(c);
	}

	virtual void remove(Component *c)
	{
// 		vector<Component *>::iterator it =find(menuComponent.begin(), menuComponent.end(), c);
// 		if (it!= menuComponent.end())
// 		{
// 			menuComponent.erase(remove(menuComponent.begin(), menuComponent.end(), c), menuComponent.end());
// 		}
	}

	Component* getChild(int i)
	{
		return menuComponent[i];
	}

	virtual const char* getName()
	{
		return name;
	}

	virtual const char* getDescripthion()
	{
		return description;
	}

	virtual void print()
	{
		cout << "Type:Menu, Name: " << getName() <<  getDescripthion() << endl;
		vector<Component *>::iterator it = menuComponent.begin();
		while (it != menuComponent.end())
		{
			(*it)->print();
			it++;
		}
	}
};

class Waitress
{
private:
	Component *menu;
public:
	Waitress(Component *c)
	{
		menu = c;
	}
	void print()
	{
		menu->print();
	}
};

#endif

#include <iostream>
#include "Component.h"
using namespace std;
int main()
{
	Component *pancakeMenu = new Menu("Pancake House Menu", "BreakFast");
	Component *dinnerMenu = new Menu("Dinner Menu", "Launch");
	Component *caffeMenu = new Menu("Caffe Menu", "Dinner");
	Component *dessertMenu = new Menu("Dessert Menu", "Dessert of course");

	Component *all = new Menu("All Menu","All Menu Combined");
	all->add(pancakeMenu);
	all->add(dinnerMenu);
	all->add(caffeMenu);

	dinnerMenu->add(new MenuItem("Pasta","Spaghetti with Marinara sauce, and a slice of sourdough bread", true, 3.89));
	dinnerMenu->add(dessertMenu);
	dessertMenu->add(new MenuItem("Apple Pie", "Apple Pie With a flaky crust", true, 1.59));
	Waitress *wa = new Waitress(all);
	wa->print();
	return 0;
}