标签：line size 设计 iter ptr 子类 composite index ack
1.意图
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对象的使用具有一致性。
2.动机
可以组合多个简单组件以形成一些较大的组件，这些组件又可以组合成更大的组件。Composite模式描述了如何使用递归组合，使得用户不必对这些类进行区别。
3.适用性
4.结构
5.代码实例
#include <memory>
#include <vector>
class Graphic
{
public:
Graphic(std::shared_ptr<Graphic> pParent);
virtual void Add(std::shared_ptr<Graphic>& pGraphic);
virtual void Remove(std::shared_ptr<Graphic>& pGraphic);
virtual std::shared_ptr<Graphic> GetChild(int iIndex);
virtual std::shared_ptr<Graphic>& GetParent();
virtual void Opereate();
protected:
std::shared_ptr<Graphic> m_pParent;
std::vector<std::shared_ptr<Graphic>> m_vecChildrenGraphics;
};
class Circle : public Graphic
{
public:
Circle(std::shared_ptr<Graphic> pParent);
void Opereate();
};
class Retangle : public Graphic
{
public:
Retangle(std::shared_ptr<Graphic> pParent);
void Opereate();
};
class Line : public Graphic
{
public:
Line(std::shared_ptr<Graphic> pParent);
void Opereate();
};
class Picture : public Graphic
{
public:
Picture(std::shared_ptr<Graphic> pParent);
virtual void Add(std::shared_ptr<Graphic>& pGraphic);
virtual void Remove(std::shared_ptr<Graphic>& pGraphic);
virtual std::shared_ptr<Graphic> GetChild(int iIndex);
void Opereate();
};
#include "Graphic.h"
#include <iostream>
Graphic::Graphic(std::shared_ptr<Graphic> pParent)
: m_pParent(pParent)
{
}
void Graphic::Add(std::shared_ptr<Graphic>& pGraphic)
{
std::cout<< "Leaf Cannot Add Childrren" << std::endl;
}
void Graphic::Remove(std::shared_ptr<Graphic>& pGraphic)
{
std::cout<< "Leaf Cannot Remove Childrren" << std::endl;
}
std::shared_ptr<Graphic> Graphic::GetChild(int iIndex)
{
std::cout<< "Leaf Cannot Get Child" << std::endl;
return nullptr;
}
std::shared_ptr<Graphic>& Graphic::GetParent()
{
return m_pParent;
}
void Graphic::Opereate()
{
std::cout<< "Default Operate Executed" <<std::endl;
}
Circle::Circle(std::shared_ptr<Graphic> pParent)
:Graphic(pParent)
{
}
void Circle::Opereate()
{
std::cout << "Circle Operate Exeeuted" << std::endl;
}
Retangle::Retangle(std::shared_ptr<Graphic> pParent)
:Graphic(pParent)
{
}
void Retangle::Opereate()
{
std::cout << "Retangle Operate Exeeuted" << std::endl;
}
Line::Line(std::shared_ptr<Graphic> pParent)
:Graphic(pParent)
{
}
void Line::Opereate()
{
std::cout << "Line Operate Exeeuted" << std::endl;
}
Picture::Picture(std::shared_ptr<Graphic> pParent)
: Graphic(pParent)
{
}
void Picture::Add(std::shared_ptr<Graphic>& pGraphic)
{
m_vecChildrenGraphics.push_back(pGraphic);
std::cout<< "ChildrenGraphics Add Success" <<std::endl;
}
void Picture::Remove(std::shared_ptr<Graphic>& pGraphic)
{
for(auto iter=m_vecChildrenGraphics.begin();
iter!=m_vecChildrenGraphics.end();++iter)
{
if((*iter) == pGraphic)
{
m_vecChildrenGraphics.erase(iter);
std::cout<< "ChildrenGraphics remove Success"<<std::endl;
break;
}
}
}
std::shared_ptr<Graphic> Picture::GetChild(int iIndex)
{
auto count = m_vecChildrenGraphics.size();
if(iIndex <= count -1)
{
std::cout<< "Get Child Success" <<std::endl;
return m_vecChildrenGraphics[iIndex];
}
return nullptr;
}
void Picture::Opereate()
{
for(auto iter=m_vecChildrenGraphics.begin();
iter!=m_vecChildrenGraphics.end();++iter)
{
(*iter)->Opereate();
}
}
#include "Graphic.h"
#include <iostream>
int main()
{
std::shared_ptr<Graphic> pPicture(new Picture(nullptr));
std::shared_ptr<Graphic> pCircle(new Circle(pPicture));
std::shared_ptr<Graphic> pRetangle(new Retangle(pPicture));
std::shared_ptr<Graphic> pLine(new Line(pPicture));
pPicture->Add(pCircle);
pPicture->Add(pRetangle);
pPicture->Add(pLine);
pPicture->Opereate();
if(nullptr == pPicture->GetParent())
{
std::cout<< "pPicture is root" <<std::endl;
}
auto pNode = pPicture->GetChild(0);
auto pParent = pNode->GetParent();
if(nullptr != pParent)
{
std::cout<<"Node has Parent"<<std::endl;
}
std::cout << "Parent Operate:"<<std::endl;
pParent->Opereate();
pNode->Opereate();
pNode->Add(pNode);
pNode->Remove(pNode);
pNode->GetChild(0);
pNode = pPicture->GetChild(1);
if(nullptr != pNode->GetParent())
{
std::cout<<"Node has Parent"<<std::endl;
}
pNode->Opereate();
pNode->Add(pNode);
pNode->Remove(pNode);
pNode->GetChild(0);
pNode = pPicture->GetChild(2);
if(nullptr != pNode->GetParent())
{
std::cout<<"Node has Parent"<<std::endl;
}
pNode->Opereate();
pNode->Add(pNode);
pNode->Remove(pNode);
pNode->GetChild(0);
pPicture->Remove(pCircle);
pPicture->Remove(pRetangle);
pPicture->Remove(pLine);
while(1);
}
6.测试结果
7.效果
标签：line size 设计 iter ptr 子类 composite index ack
原文地址：http://www.cnblogs.com/zhengxingpeng/p/6686302.html
