15.1.解释
概念：将对象组合成树形结构以表示“部分-整体”的层次结构。Composite使得用户对单个对象和组合的使用具有一致性。
main()，客户
CCorpNode，抽象基类，实现基本信息
CBranchNode，树枝节点，实现Addordinate()函数和GetSubordinate()函数
CLeafNode，叶子节点，IsLeaf属性总是“true”
说明：组合模式主要是实现在CBranchNode对象里增加对其它对象的数组，如vector<CCorpNode*>，数组里可以存放CBranchNode和CLeafNode对象。这样方便进行遍历操作。
注意：组合模式有透明组合模式和安全组合模式。透明组合模式是将Addordinate和GetSubordinate这两个函数也抽象到CCorpNode基类里，这增加了操作叶子节点的难度，更易出现逻辑问题。所以尽量使用安全模式。
这个简单了，可以想像一下TreeView和TreeNode基本上是这个意思了，将很多数据组织在一块。
看代码：
//CorpNode.h
#pragma once
#include <iostream>
using std::string;
class CCorpNode
{
public:
CCorpNode();
CCorpNode(string _name, string _pos, int _salary);
virtual ~CCorpNode(void);
virtual string GetInfo();
void SetParent(CCorpNode *_pParent);
CCorpNode * GetParent();
virtual bool IsLeaf() = 0;
private:
string m_name;
string m_position;
int m_salary;
protected:
bool m_isLeaf;
CCorpNode *m_pParent;
};
//CorpNode.cpp
#include "StdAfx.h"
#include "CorpNode.h"
#include "..\CommonDeclare\Convert.h"
CCorpNode::CCorpNode(void)
{
m_name = "";
m_position = "";
m_salary = 0;
}
CCorpNode::CCorpNode(string _name, string _pos, int _salary) : m_name(_name), m_position(_pos), m_salary(_salary)
{
}
CCorpNode::~CCorpNode(void)
{
}
string CCorpNode::GetInfo()
{
string info = "";
info.append("姓名：");
info.append(this->m_name);
info.append("\t职位：");
info.append(this->m_position);
info.append("\t薪水：");
info.append(CConvert::ToString(this->m_salary));
return info;
}
void CCorpNode::SetParent( CCorpNode *_parent )
{
this->m_pParent = _parent;
}
CCorpNode * CCorpNode::GetParent()
{
return this->m_pParent;
}
//BranchNode.h
#pragma once
#include "corpnode.h"
#include "CorpNode.h"
#include <vector>
#include <iostream>
using std::vector;
using std::string;
class CBranchNode :
public CCorpNode
{
public:
CBranchNode(void);
CBranchNode(string name, string pos, int salary);
~CBranchNode(void);
void Add(CCorpNode *pcorpNode);
vector<CCorpNode*> GetSubordinateInfo();
bool IsLeaf();
private:
vector<CCorpNode*> m_subordinateList;
};
//BranchNode.cpp
#include "StdAfx.h"
#include "BranchNode.h"
CBranchNode::CBranchNode(void)
{
m_isLeaf = false;
}
CBranchNode::CBranchNode( string name, string pos, int salary ) : CCorpNode(name, pos, salary)
{
m_isLeaf = false;
}
CBranchNode::~CBranchNode(void)
{
}
void CBranchNode::Add( CCorpNode *pcorpNode )
{
pcorpNode->SetParent(this);
m_subordinateList.push_back(pcorpNode);
}
vector<CCorpNode*> CBranchNode::GetSubordinateInfo()
{
return this->m_subordinateList;
}
bool CBranchNode::IsLeaf()
{
return m_isLeaf;
}
//LeafNode.h
#pragma once
#include "corpnode.h"
class CLeafNode :
public CCorpNode
{
public:
CLeafNode(void);
CLeafNode(string name, string pos, int salary);
~CLeafNode(void);
bool IsLeaf();
};
//LeafNode.cpp
#include "StdAfx.h"
#include "LeafNode.h"
CLeafNode::CLeafNode(void)
{
m_isLeaf = true;
}
CLeafNode::CLeafNode( string name, string pos, int salary ) : CCorpNode(name, pos, salary)
{
m_isLeaf = true;
}
CLeafNode::~CLeafNode(void)
{
}
bool CLeafNode::IsLeaf()
{
return m_isLeaf;
}
曾经开发过一款Gantt图的控件，采用的就是这种模式，有GanttView和GanttNode两个类，IGanttNode一个接口，GanttScale标尺类。GanttView负责显示，GanttNode是实现类，只有一个GanttNode类来实现数据的组合，IGanttNode指示了一个IGanttNodeCollection属性来记录所有下级结点的集合。算是实践中的一个应用吧。