C++ bind member function with variadic template -

my example below uses variadic templates register function inside class. registering single function works class member functions? tried std::bind expects placeholders not option because don't know number of arguments. there simple way doing in c++11 or forced implement register function every amount of arguments?

template<typename treturn, typename... targs> class func {     std::function<treturn (targs...)> fn;      template<typename tfunction, typename tobject>     bool register(tfunction f, tobject obj){      }      bool register(std::function<treturn (targs...)> f){         fn = f;         return true;     }    } 

create lambda function required signature , construct std::function object it.

template<typename treturn, typename... targs> class func {     std::function<treturn (targs...)> fn;      template<typename tfunction, typename tobject>     bool register(tfunction f, tobject obj){         fn = [obj](targs... args){return (obj.*f)(args...);};         return true;     }      bool register(std::function<treturn (targs...)> f){         fn = f;         return true;     }    } 

(note : member function pointers need used corresponding object, object reference or pointer object of appropriate class. if tobject value-like, member function call syntax (obj.*f). if tobject pointer-like, syntax (obj->*f).)