Re: Problems with g++ 4.0.2 (templates, friends and inheritance)

[Maurizio Loreti]

Emanuel Ziegler <eziegler@web.de> writes:

> compiled without any problems before, it now gives the errors
>   error: 'get_test' is neither function nor member function; cannot be 
> declared friend

well, the diagnostic is clear; g++ needs a prototype in scope of the
function to be declared friend.  the followign compiles correctly:

,-----
| template <class T> class FriendClass;
| 
| template <class T> T get_test (const FriendClass<T> &fc) {
|   return fc.test; } 
| 
| template <class T> class FriendClass {
|   friend T get_test<T> (const FriendClass<T> &);
|   protected:
|     T test;
| };
| 
| int main () {
|   FriendClass<int> fc;
|   get_test(fc);
|   return 0;
| }
`-----

for your second problem, have a look to the point 2 of the "C++
templates FAQ" at http://womble.decadentplace.org.uk/c++/template-faq.html

-- 
Maurizio Loreti                         http://www.pd.infn.it/~loreti/mlo.html
Dept. of Physics, Univ. of Padova, Italy              ROT13: ybergv@cq.vasa.vg