Hi Damanjit. As far as I understand there is some confusion with pointers to member functions esp. if they are static depending on the compiler. I managed to get your code compiled by removing the & in > typedef B<T,&ASFreeWrapper> Type; Can't recall which is correct but I think the version without &. and of course including malloc.h for free(). This is with gcc4.0.1 on a x86 system. On my gentoo version of gcc3.4.3 I get an ICE, but I guess that is a known issue. Does anybody know? If you are interested: I found http://www.codeproject.com/cpp/FastDelegate.asp an informative read. Goes into detail what the standard says about member function pointers and what different compilers actually implement. Hope this helps - Peter On Thursday 19 May 2005 14:12, Damanjit Singh wrote: > #include "iostream.h" > #include "stdio.h" > template <class T,void (*DestroyCallback)( T )> class B > { > private: > int a; > }; > template <class T> class A > { > private: > static void ASFreeWrapper( T Ptr ) > { > free( Ptr ); > } > public: > typedef B<T,&ASFreeWrapper> Type; > > }; > int main() > { > A<int *> a; > return 0; > } On Thursday 19 May 2005 14:12, Damanjit Singh wrote: > The following code does not compile with gcc (ggc -c simple.cpp) and > gives the following errors ( where as the code compiles in windows > VC++ )- > Could someone tell me the reason for this, and if there is an > available workaround. > Thanks, > > #include "iostream.h" > #include "stdio.h" > template <class T,void (*DestroyCallback)( T )> class B > { > private: > int a; > }; > template <class T> class A > { > private: > static void ASFreeWrapper( T Ptr ) > { > free( Ptr ); > } > public: > typedef B<T,&ASFreeWrapper> Type; > > }; > int main() > { > A<int *> a; > return 0; > } > > /* Here is the error reported by gcc - > simple.cpp:9: warning: all member functions in class `A<T>' are private > simple.cpp: In instantiation of `A<int*>': > simple.cpp:21: instantiated from here > simple.cpp:16: invalid use of undefined type `class A<int*>' > simple.cpp:9: declaration of `class A<int*>' > */
