Re: Where to include header files - relates to last question on variable scope

FROM : Ole Voß
DATE : Mon Nov 01 13:14:59 2004

Jiri Volejnik wrote:

>> Why do I have to include the header file of this singleton class in
>> every
>> other class I use it in? Should the class not be available to the
>> compiler
>> the moment it's included in the 'main.m'?

>
>
> Every source file is compiled separately in C, C++ and Objective-C. If
> there are some external declarations needed for the compilation, than
> you have to #include or #import the appropriate header file. If you
> need some declaration to be available in every source file of your
> project, then you also have to #include or #import the header file in
> every source file. That's simply the way it is.
> If you really want some declarations to be available anywhere in your
> app without #importing it, you can declare it (or #import it) just
> once - in precompiled header. However, note that this is not the
> primary purpose of the precompiled header. Main purpose of the
> precompiled header is to speed up compilation. Only rarely changed
> declarations should therefore appear in the precompiled header. Every
> change in the precompiled header or in any header #imported by
> precompiled header will cause recompilation of all source files in
> your project.
>

>> Still, I think that you should not hang around a mailing list like
>> cocoa-dev if you feel bothered by questions posed by people
>> less-knowing than you. Afterall you might need help from me someday
>> for something that does not seem 'basic' to you.

>
>
> I'm surprised by this reaction. The guys were trying to help you,
> spending their time, although the question doesn't come under
> cocoa-dev. You could be RTFM'd instead.
>
> -- Jirka


I was not referring to everybody that posted a reply - just to one
specific person. And I'd be happy to RTFM if anybody could finally name
me the 'F' Manual that I should be reading!

I don't understand why this question doesn't relate to cocoa?! I use
obj-c to do cocoa programming, don't I? It's like saying gasoline
doesn't relate to my engine ;-)

Regards,

Ole.