Question

I have a set of callback classes that I use for handling callbacks with variable numbers of parameters. Right now I have about 6 different instances of it to handle differing numbers of arguments. Is there a way to make one instance than can handle a variable number of arguments?? Ultimately I would love to have each parameter be a POD type or a class pointer, or a struct pointer. Any ideas?

template <class T> class kGUICallBackPtr { public:     kGUICallBackPtr() {m_obj=0;m_func=0;}     void Set(void *o,void (*f)(void *,T *));     inline void Call(T *i) {if(m_func) m_func(m_obj,i);}     inline bool IsValid(void) {return (m_func!=0);} private:     void *m_obj;     void (*m_func)(void *,T *); };   template <class T,class U> class kGUICallBackPtrPtr { public:     kGUICallBackPtrPtr() {m_obj=0;m_func=0;}     void Set(void *o,void (*f)(void *,T *,U *));     inline void Call(T *i, U *j) {if(m_func) m_func(m_obj,i,j);}     inline bool IsValid(void) {return (m_func!=0);} private:     void *m_obj;     void (*m_func)(void *,T *,U *j); }; 

Answer 1

Not yet in the language itself but C++0x will have support for variadic templates.