43.c++指針類型轉換

• 數據類型轉換(static_cast)

  //數據類型轉換
  printf("%d\n", static_cast<int>(10.2));

   

• 指針類型轉換(reinterpret_cast)

  指針類型轉換
  int *pint = new int(1);
  char *pch = reinterpret_cast<char *>(pint);

   

• 涉及到const的指針類型轉換(const_cast)

  const int num[5] = { 1,2,3,4,5 };
  const int *p = num;
  int *pint = const_cast<int *>(p);

   

   

• 子類轉化為父類(dynamic_cast)

  class man
  {
  public:
      int name;
      //加上virtual關鍵字,可以使得父類用子類初始化后可以調用子類的函數
      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;
      //子類指針轉換為父類指針,但是還是調用子類的函數
      man *pfu = dynamic_cast<man *>(pson);
      pfu->run();
      system("pause");
  }