c++ - Template class hierarchy friend inheritance -


i'm tinkering c++ , facing following problem:

given:

class {     int avar;  public:     a(){}     virtual ~a(){}; };  template<class base> class b: public base {     int bvar;  public:     b() : base() {}     virtual ~b() {} };  template<class base> class c: public base{     int cvar;  public:     c() : base() {}     virtual ~c() {} }  d,e,f,g...

i can sort of branched class hierarchy inherits parameters , functions , such. typedef c<b<a>> abc;

however, supposed have class "manages" combinations of these objects through protected access.

template<class type> struct manager {     type current;      manager() {         current.avar++;         current.bvar++;         current.cvar++;         }     ~manager(){} };

and question is: how set a, b, , c classes friend manager regardless of manager's template type? (e.g. manager template abc, eabc, dabc, xyzefgabc, ...)

just have them friend manager:

class {     template <typename t>     friend struct manager; };  template<class base> class b: public base {     template <typename t>     friend struct manager; };  // etc.

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