关于sizeof操作符的理解和总结

char) = 1
      };
      a _x;
      cout<<sizeof(_x)<<endl;//输出20
     
      变为:
      class a
      {
      public:
      a(){ _data = new char [100];}
      ~a(){ delete [] _data;}
      char * _data;   //sizeof(pointer) = 4
      char dat[10];   //sizeof(dat) = 10  换位置
      long data2;     //sizeof(long) = 4  换位置
      char dat1;      //sizeof(char) = 1
      };
      a _x;
      cout<<sizeof(_x)<<endl;//输出24