43.c++指针类型转换

• 数据类型转换(static_cast)

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

• 指针类型转换(reinterpret_cast)

  指针类型转换
  int *pint = new int(1);
  char *pch = reinterpret_cast<char *>(pint);

• 涉及到const的指针类型转换(const_cast)

  const int num[5] = { 1,2,3,4,5 };
  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");
  }