设计模式之组合模式(Composite)

组合模式原理：组合模式的作用是讲继承同一父类的不同子类对象组合起来，形成一个树形的结构，例如公司的部门组织

代码如下

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

/************************************************************************/
/* 组合模式的作用是讲继承同一父类的不同子类对象组合起来                 */
/************************************************************************/
class Company
{
public:
	Company(string name)
	{
		m_name = name;
	}
	virtual void  show(int depth)
	{

	}
	virtual void Add(Company *pComp)
	{

	}
protected:

	string m_name;
};

//组合类
class ConcreteCompany:public Company
{
public:
	ConcreteCompany(string name):Company(name)
	{

	}
	virtual void Add(Company *pCompany)
	{
		m_ListCompany.push_back(pCompany);
	}
	virtual void  show(int depth)
	{
		list<Company*>::iterator iter = m_ListCompany.begin();
		for (;iter != m_ListCompany.end();++iter)
		{
			(*iter)->show(depth + 1);
		}
	}
private:
	list<Company *> m_ListCompany ;
};

//具体类
class FinanceDepartment:public Company
{
public:
	FinanceDepartment(string name):Company(name){}
	virtual void  show(int depth)
	{
		for (int i = 0;i < depth;++i)
		{
			cout << "-";
		}
		cout << m_name << endl;
	}

};
class ITDepartment:public Company
{

public:
	ITDepartment(string name):Company(name){}
	virtual void  show(int depth)
	{
		for (int i = 0;i < depth;++i)
		{
			cout << "-" ;
		}
		cout << m_name << endl;
	}
};
int main()
{
	Company *root = new ConcreteCompany("总公司");
	Company *leaf1 = new FinanceDepartment("财务部");
	Company *leaf2 = new ITDepartment("信息部");
	root->Add(leaf1);
	root->Add(leaf2);

	Company *mid = new ConcreteCompany("分公司");
	Company *mleaf1 = new FinanceDepartment("财务部");
	Company *mleaf2 = new ITDepartment("信息部");
	mid->Add(mleaf1);
	mid->Add(mleaf2);
	root->Add(mid);
	root->show(1);

	return 0;
}