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

I just tried borland c++ compiler, it works for both cases.

On Feb 16, 1:21 am, SeaN <guo.xiaoy...@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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