Re: Wrapping C functions

[David Chisnall]

On 6 Aug 2009, at 17:48, Martin Kalbfuß wrote:

> Some functions belong clearly to an object, like the bitmap  
> functions for
> example. But I don't know whhere to put functions like SDL_init.  
> Should I
> create a library object or system object or something?

The best place for things like this is inside a +initialize method.   
On some object wrapping global SDL state, add this method:

+ (void)initialize
{
        // Protect from calls by subclass
        if (self != [SDLState class]) return;

        SDL_init();
        // Any other library initialization that you need.
}

This method will be called exactly once the first time the SDLState  
class receives.  In order to instantiate the class, you send it an  
+alloc (or similar) message, so this will be called before the first  
time you create an instance of the class.

David