david.hagood wrote:
>
> On Thu, 2010-10-07 at 14:08 -0700, brac37 wrote:
>> Hello,
>>
>> I have some code that works when I make class classA public. But I only
>> want
>> class classA to be accessible by itself and class classB. So the problem
>> is
>> very concrete: make classB a friend of classA.
>>
>> Here is the code that describes both classes.
>>
>>
>>
>> template <class T, int C> class classA;
>>
>> template <class T, int C, classA<T,C> &instanceA> class classB;
>>
>> template <class T, int C> class classA
>> {
>>
>> template <classA &instanceA> friend class classB;
> I think your problem is that you are not fully specifying the template
> parameters for class B, thus as far as class A is concerned, you are
> speaking of some other class B.
>
> I think you have to fully spec out class B here:
>
> friend class classB<T,C,classA&>;
>
>>
>>
>> private:
>> int for_use_by_classB;
>>
>> };
>>
>> template <class T, int C, classA<T,C> &instanceA> class classB
>> {
>>
>> classB (int i) { instanceA.for_use_by_classB = i; }
>>
>> };
>>
>> // instantiation gives error
>> // template class classA<char,128>;
>>
>
No, that does not work. This time, the error is given already before
instantiation. The error is that that the third parameter ClassA & is not of
the right kind: it is a type instead of a constant instance of that type.
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