I just read this Use C Struct in Objective C question, and I was wondering why anyone would want to use function pointers in structs. Wouldn't wrapping the functions in a class be equivalent?
-
3It certainly is a C question. In C, function pointers are shoved into structs all the time and often into roles exactly like what class inheritance gives you in an OO language.bbum– bbum2010-02-01 04:42:10 +00:00Commented Feb 1, 2010 at 4:42
Add a comment
|
2 Answers
I don't think that you would need anything like that in objective-c.
That's how you would implement polymorphism in C. It's like defining an interface. Some frameworks (including kernel? filesystem?) would expect you to pass in a structure with your functions which the framework would than call when some event happened.
If you really really need I think you could use c++ and struct/classes from objective-c instead of using plain C structures with function pointers but you should be okay with using objective-c.
Comments
Function pointers are used like that in C for creating polymorphic behavior, sort of a poor man's object. The only reasons I can think of doing this other than conforming to an existing C library is to gain a performance advantage over objective-c method dispatch.
