RE: [Dev-C++] Static members for callbacks

[Ioannis V. <no...@ho...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Abhijit Shylanath
> Sent: Friday, July 26, 2002 11:08 PM
> To: Dev-C++ Mailing List
> Subject: [Dev-C++] Static members for callbacks
> 
> 
> [... back to right now...]
> 
> Okay... putting eleventeen and twenty kazillion together... 
> it seems you
> cannot callback to non-static member functions (i.e., you 
> cannot have a
> function pointer pointing to a non-static method).


Ok.. It seems i confused subjects. I was thinking that we were talking
about some graphics classes but anyway i am reading like crazy these
days C++ and .NET and there may be some lost clusters somewhere. :)


You can have a function pointer to point to some member functions. But a
non-static member function is not a regular function, that's why we use
special-kind of pointers (a static function on the other hand is a
regular function).


#include <iostream>


int main()
{
  class A
  {
    public:
    void something() { std::cout<<"Hello, new world!\n"; }
  }a;
  
  void (A::*pf)()=&A::something;
  
  (a.*pf)();
  

}  


 
> I tried creating a class to test this, and I discovered that 
> it's true...
> why?
> 
> I tried callback = this->internal, testclass::internal, 
> this::internal...
> yup, I got pret-ty desparate.
> 
> I also tried casting the method, using type-casting 
> (C-style), static_cast
> and dynamic_cast to a pointer, but it doesn't work. I get an 
> error about
> converting to a pointer and compilation stops.
> 
> [... back to the day I first rode a bike... hey, it's *my* post.]



Well if i understood well your problem was that you did not know how to
define a pointer to member function. Tell me if your problem was solved.



Keep coding,
Ioannis

* Ioannis Vranos
* Programming pages: http://www.noicys.cjb.net
* Alternative URL: http://run.to/noicys