#include <functional>

int f1(int a, int b, bool c)
{
    return c ? a + b : a - b;
}

int f2(int a )
{
    return a * 2;
}

int f3(){
  return 0;
}

void f4(){
  int a;
  int b;
}

template <typename R, typename... Args>
R call(void* funcaddr, Args... args)
{
    typedef R(*Function)(Args...);
    Function fnptr = (Function)funcaddr;
    return fnptr(args...);
}https://pastebin.com/

int main(){


  call<int>( (void*)f1, 42, 10, true);
  call<int>( (void*)f2, 42 );
  call<int>( (void*)f3 );
  call<void>( (void*)f4 );


}