43.c++指针类型转换

• 数据类型转换(static_cast)

  //数据类型转换
  printf("%d\n", static_cast<int>(10.2));

• 指针类型转换(reinterpret_cast)

   指针类型转换
   int *pint = new int();
   char *pch = reinterpret_cast<char *>(pint);

• 涉及到const的指针类型转换(const_cast)

   const int num[] = { ,,,, };
   const int *p = num;
   int *pint = const_cast<int *>(p);

• 子类转化为父类(dynamic_cast)

   class man
   {
   public:
       int name;
       //加上virtual关键字,可以使得父类用子类初始化后可以调用子类的函数
       virtual void run()
       {
           cout << "man is running" << endl;
       }
   };
  
   class son :public man
   {
   public:
       void run()
       {
           cout << "son is running" << endl;
       }
   };
  
   void main()
   {
       /*man man1;
       son son1;
       man *p = &man1;
       p->run();
       p = &son1;
       p->run();*/
       man *pman = new man;
       son *pson = new son;
       //子类指针转换为父类指针,但是还是调用子类的函数
       man *pfu = dynamic_cast<man *>(pson);
       pfu->run();
       system("pause");
   }