BRIDGE - 桥模式

*/--------------老师讲解的代码实现
封装实现代码*/

class Head{
public:
 virtual void show() = 0;
};
class Text{
public:
 virtual void show() = 0;
};
class Tail{
public:
 virtual void show() = 0;
};
class RedHead:public Head{
public:
 virtual void show(){
  std::cout<<"red head"<<std::endl;
 }
};
class BlueHead:public Head{
public:
 virtual void show(){
  std::cout<<"blue head"<<std::endl;
 }
};
class YellowHead:public Head{
public:
 virtual void show(){
  std::cout<<"Yellow head"<<std::endl;
 }
};
class RedTail:public Tail{
public:
 virtual void show(){
  std::cout<<"Red tail"<<std::endl;
 }
};
class BlueTail:public Tail{
public:
 virtual void show(){
  std::cout<<"Blue tail"<<std::endl;
 }
};
class LongText:public Text{
public:
 virtual void show(){
  std::cout<<"Long text"<<std::endl;
 }
};
//结构封装
class List{
private:
 Head *headPtr;
 Text *textPtr;
 Tail *tailPtr;
public:
 List()
 {
  headPtr = NULL;
  textPtr = NULL;
  tailPtr = NULL;
 }
 void setCOM(Head *head, Text *text, Tail *tail){
  headPtr = head;
  textPtr = text;
  tailPtr = tail;
 }
 void showCOM()
 {
  if(headPtr != NULL)
   headPtr->show();
  if(textPtr != NULL)
   textPtr->show();
  if(tailPtr != NULL)
   tailPtr->show();
 }
 ~List(){
  delete headPtr;
  delete textPtr;
  delete tailPtr;
 }
};