装饰模式 C++实现

装饰模式

​ 装饰模式（Decorator），动态地给一个对象添加一些额外的职责，就增加功能来说，装饰者模型比生成子类更为灵活。

  
  #include <iostream>
  #include<string>
  using namespace std;
  //"Person"类（concretetcomponent）
  class Person
  {
  public:
      
      virtual void show(){}
      
  };
  //服饰类（Decorator）
  class Finery :public Person
  {
  protected:
      Person *component;
  public:
      void Decorate(Person *components)
      {
          component = components;
      }
      void show()
      {
          if(component!=NULL)
              component->show();
      }
  };
  //具体装饰类（ConcreteDecorator）
  class TShirts :public Finery
  {
  public:
      void show()
      {
          cout << "大T恤" << endl;
          component->show();
  ​
      }
  };
  class Trouser :public Finery
  {
  public:
      void show()
      {
          cout << "裤子哦" << endl;
          component->show();
      }
  };
  class Skirt :public Finery
  {
  public:
      void show()
      {
          cout << "裙子吗" << endl;
          component->show();
  ​
  ​
      }
  };
  int main()
  {
      Person* x = new Person();
      cout << "第一种装扮:" << endl;
      TShirts *t = new TShirts();
      Trouser *T = new Trouser();
      Skirt *S = new Skirt();
      T->Decorate(x);
      t->Decorate(T);
      S->Decorate(t);
      S->show();
      delete[] x;
      delete[] t;
      delete[] T;
      delete[] S;
      return 0;
  }