Difficulty porting SMPEG player's "update" from C to C++

[Doru-Catalin Togea]

Hi!

I am runing RedHat 7.3 with gcc 2.96.

I am trying to port the SMPEG player from C to C++, and I have a problem
which I do not understand, while porting the very "simple" update(...)
function:

The C programme is like this:

==================================================================
#include ...

// the function I have problems with:
void update(SDL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h)
{
    if ( screen->flags & SDL_DOUBLEBUF ) {
        SDL_Flip(screen);
    }
}

main(int argc, char *argv[])
{
...
  if ( info.has_video && use_video ) {
    ...
    SMPEG_setdisplay(mpeg, screen, NULL, update); // update called here
                                                  // by referance
  }
...
}
==================================================================


In my C++ programme I have a class declared as follows:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class MPEGPlayer : public Module {
 private:
  ...
  // cut-and-paste from the C programme
  void update(SDL_Surface *screen,
	      Sint32 x, Sint32 y, Uint32 w, Uint32 h);

  // the C'programme's main routine's code
  // will be run here:
  static void *playMPEG (void *threadArgs);
 public:
  ...
};

void MPEGPlayer::update(SDL_Surface *screen,
			Sint32 x, Sint32 y, Uint32 w, Uint32 h)
{
    if ( screen->flags & SDL_DOUBLEBUF ) {
        SDL_Flip(screen);
    }
}

// basically the same code as the C programme's main routine:
void *MPEGPlayer::playMPEG(void *threadArgs)
{
...
  if ( info.has_video && use_video ) {
    ...
    SMPEG_setdisplay(mpeg, screen, NULL, update); // update called here
                                                  // by referance
  }
...
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I try to compile my C++ programme (which uses the MPEGPlayer class) with
the following command:

[...]$ g++ `sdl-config --cflags --libs`
-I/usr/include/smpeg/  -lsmpeg -lSDL -o receiver receiver.cpp

I get the following error message:

In file included from receiver.cpp:10:
mpegPlayer.h: In function `void *MPEGPlayer::playMPEG (void *)':
mpegPlayer.h:385: no matches converting function `update' to type `void
(*) (struct SDL_Surface *, int, int, unsigned int, unsigned int)'
mpegPlayer.h:219: candidates are: void MPEGPlayer::update (SDL_Surface
*, int, int, unsigned int, unsigned int)

Can anyone tell me what I am doing wrong?

Thanks a lot,
Catalin

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