c++ - Template error with dependent names -

in following code, compile error don't have if remove templates :

template<int dim> class myclass { public :     enum mode {aa,bb};     myclass(){}; };  template<int dim> class  myclass2 {     myclass2(){};     void myfunc(myclass::mode m); };  template<int dim> void myclass2<dim>::myfunc(myclass<dim>::mode m) { } 

test.cpp(19) : warning c4346: 'myclass::mode' : dependent name not type
prefix 'typename' indicate type
test.cpp(19) : error c2146: syntax error : missing ')' before identifier 'm'

if remove like:

template<int dim> void myclass2<dim>::myfunc(myclass::mode m) 

i :

test.cpp(19) : error c2955: 'myclass' : use of class template requires template argument list

and if put definition of myfunc directly in declaration of class (which avoid), works.

what should , why happen?

thanks

i believe have 2 problems in code. first in declaration in myclass2:

void myfunc(myclass::mode m); 

because myclass template, need specify template parameter is. assume meant write

void myfunc(myclass<dim>::mode m); 

however, due weird idiosyncrasy in c++, write as

void myfunc(typename myclass<dim>::mode m); 

the typename keyword here tells c++ mode name of type nested inside of class myclass<dim>.

similarly, later in code, code

template<int dim> void myclass2<dim>::myfunc(myclass<dim>::mode m) { } 

should read

template<int dim> void myclass2<dim>::myfunc(typename myclass<dim>::mode m) { } 

to tell compiler mode name of type.

hope helps!