functor - Is it possible to make a function pointer with parameters in C++ -

i'm trying capture function pointer hand functor , don't understand why can't.

functor class:

template <class c> class myfunctor : public basefunctor {   public:     typedef long (c::*t_callback)(const long, const char *);      myfunctor (void) : basefunctor(), obj(null), callback(null) {}     virtual long operator() (const long a, const char *b) {         if ( obj && callback ) {             (obj->*callback)(a,b);         }     }      c *obj;     t_callback callback; }; 

elsewhere in code:

the function signature long c::func (const long, const char *)

myfunctor funky; funky.obj = this; funky.callback = func; 

then error:

... function call missing argument list; ...

why not work?

edit: in working through suggestions below, came across simple solution make particular implementation work.

funky.callback = &c::func;

i'm not 100% sure trying code 2 c++ features easier use function pointers std::function , std::mem_fn here's example of using std::function site.

#include <functional> #include <iostream>  struct foo {     foo(int num) : num_(num) {}     void print_add(int i) const { std::cout << num_+i << '\n'; }     int num_; };  void print_num(int i) {     std::cout << << '\n'; }  struct printnum {     void operator()(int i) const     {         std::cout << << '\n';     } };  int main() {     // store free function     std::function<void(int)> f_display = print_num;     f_display(-9);      // store lambda     std::function<void()> f_display_42 = []() { print_num(42); };     f_display_42();      // store result of call std::bind     std::function<void()> f_display_31337 = std::bind(print_num, 31337);     f_display_31337();      // store call member function     std::function<void(const foo&, int)> f_add_display = &foo::print_add;     foo foo(314159);     f_add_display(foo, 1);      // store call function object     std::function<void(int)> f_display_obj = printnum();     f_display_obj(18); } 

this function pointer in code:

typedef long (c::*t_callback)(const long, const char *); 

to make std::funciton do:

std::function<long(const long,const char*)> t_callback = something;