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Index › Programming Questions & Help › Syntax Questions › forward references in classes
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forward references in classes (Read 385 times)
maxf
forward references in classes
Mar 11th, 2008, 10:43pm  
Hi There, sorry if this is a FAQ. Is there a way to fix circular class definitions?

class A {
 B b;
}
class B {
 A a;
}

makes Processing complain that it doesn't find Type B.
I've got plenty of such small classes in my source, which I'd hate
to split in as many source files.
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taifunbrowser
Re: forward references in classes
Reply #1 - Mar 12th, 2008, 12:31am  
Try using Eclipse IDE (see Integration forums).

link: http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Integrate;action=display;num=1117133941

Not to say that future versions of the processing IDE might not surpass eclipse's features, but eclipse has a reputation for being right awesome.
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fry
Re: forward references in classes
Reply #2 - Mar 12th, 2008, 8:01am  
or add .java to the name of the tab (can't be the main one, though), which will circumvent the preprocessor (see help -> getting started for more about tabs).
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maxf
Re: forward references in classes
Reply #3 - Mar 13th, 2008, 2:32am  
fry wrote on Mar 12th, 2008, 8:01am:
or add .java to the name of the tab (can't be the main one, though), which will circumvent the preprocessor (see help -> getting started for more about tabs).


So I tried that but I'm hitting the problem of external classes (in the .java tabs) not finding core functions. I understand I can either:
- write everything as: processing.core.PApplet.sin(p*processing.core.PConstants.TWO_PI / x)
- or pass PApplet to all the subclasses as a parameter to the each constructor

Is there a simpler way
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maxf
Re: forward references in classes
Reply #4 - Mar 14th, 2008, 12:09am  
I found what I was doing wrong: my pde didn't have any setup/draw functions, and therefore, when transformed to Java, the whole code (including the class declarations) was included into setup(). And in this context, classes can't forward reference. Re-adding the functions at the bottom works.

(Although the answers to my original question misled me into investigating splitting my code into files (only because I hadn't explained well), it wasn't a waste of time, as I've now realised that if your hack has more than one sourve file it's not possible to do much without ditching the PDE and going full-Java instead.)
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