Re: class does not want to get friends with another class

[brac37 <MichieldeB at aim dot com>]

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.
-- 
View this message in context: http://old.nabble.com/class-does-not-want-to-get-friends-with-another-class-tp29910278p29915039.html
Sent from the gcc - Help mailing list archive at Nabble.com.