[Adelaid]

Hey guys, so I’m in the middle of completing my C++ games assignment and I’ve ran into a pretty decent problem I can’t solve.

The game is complete but the problem comes with coding the menu system and the buttons.

My button class is pretty basic, it holds a texture, position and a function to point to when clicked.

void (*m_action)();

Now the problem I’ve ran into is, that works but only for functions declared inside the main method and not inside any other class.

I’m working with a

main
Game
Button

The main class holds the game class and the game class holds the button class.

The problem I’ve ran into is sending the button a pointer to a Game::*function rather just a *function.

I’ve tried many things to get this to work but still can’t get the button to hold a member pointer to function inside the game class.

If anyone could help I’d be eternally grateful!

[Amit]

I’m not sure what do you mean by ‘game class holds the button class.’, let’s suppose this means: ‘game class holds instance of a button class’ (not declaration of this class). In this case simple-sample can look like this (tested in vs2010):

class Button;
class Game
{   
   Button button;
   public:   //Function must be public, otherwise it will be impossible do something like this: "Game::Add" outside class Game!
      float Add(float x, float y) { return x + y; }
};

class Button
{
   public:
   float (Game::*pt2mfn)(float x, float y);
   Button()
   {
      pt2mfn = &Game::Add;
   }
};

int _tmain(int argc, _TCHAR* argv[])
{
   Button btn;
   Game game;
   
   //Naturally we will need instance of Game class to call nonstatic, member method!
   std::cout<< (game.*btn.pt2mfn)(1.0f, 1.0f) << std::endl;
   system("pause");
   return 0;
}

[SapnaVishwas]

Have a look at boost::function and boost::bind, they may be helpful.