[Cpp-Programming] Re: Template problem, data member undefined!!!

It is working either case...friend

what was the problem...

Thanks & Regards
Ramaraju

On Mon, Feb 16, 2009 at 11:51 AM, SeaN <guo.xiaoyong@gmail.com> wrote:

Please take a look at the following code,
my question is: why I have to use
Base<_Tp>::datamember to refer the datamember
in the base class in the derived class?
When I use datamember in the derived class,
the compilation would fail.

I use gcc 3.4.4 (cygwin)



#include <iostream>

template <typename _Tp>
class Base
{
protected:
   _Tp numArray[3];
   Base()
   {
       numArray[0] = static_cast<_Tp>(1);
       numArray[1] = static_cast<_Tp>(11);
       numArray[2] = static_cast<_Tp>(111);
   };
};

template <typename _Tp>
class Deriv: public Base<_Tp> {
public:
   Deriv() {

       /* Why the following commented code can not be successfully compiled?
        * I got the numArray undefined error !!
        *
       std::cout << numArray[0] << std::endl;
       std::cout << numArray[1] << std::endl;
       std::cout << numArray[2] << std::endl;
       */

       /* correct code */
       std::cout << Base<_Tp>::numArray[0] << std::endl;
       std::cout << Base<_Tp>::numArray[1] << std::endl;
       std::cout << Base<_Tp>::numArray[2] << std::endl;
   };
};

int main(void)
{
   Deriv<int> de;

   return 0;
}

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