Re: Call unknown function by pointer

kankan wrote:
[snip]

Maybe, just maybe, you actually want something like this:

class Func_wrapper {
   public:
     virtual ~Func_wrapper();

     virtual void call(const Args & args) const = 0;
};

template <typename ...Params>
class Func_wrapper_impl : public Func_wrapper {
   public:
     explicit Func_wrapper_impl(void (*func)(Params...)) : func(func) {}

     virtual void call(const Args & args) const {
         /* check and extract Params from args and call func */
         /* a bit of meta-programming kung fu is required */
     }

   private:
     void (*func)(Params...);
};

void f1(int, char);

int main() {
     std::shared_ptr<Func_wrapper> w_f1 =
         std::make_shared<Func_wrapper_impl<int, char>>(f1);

     Args args = /* depends on implementation */

     w_f1->call(args);
}

I won't discuss about the purpose of making a design like this,
it's up to OP to tell us if this is what he wanted...

See, everything is possible in C++.

Now, will someone try answer my question in the thread
"Templates and ADL"? :-)

--
      [ See http://www.gotw.ca/resources/clcm.htm for info about ]
      [ comp.lang.c++.moderated. First time posters: Do this! ]