Re: [Swarm-Support] setBorderWidth

[Paul Johnson]

I don't know if you got an answer for this yet. I keep thinking I 
answered it before, but no note appeared, so I try again.

The answer is that when Swarm became Java compatible, there were some 
methods that had to be redesigned to return void rather than an object. 
 Many of those examples were in the Graph library, and so you had to 
rewrite code.  Instead of assuming that a method like

-setBorderWidth:(int)width

would return the object, now you have to assume it returns nil.

Old code that used to look like this:

[[[[aThing setBorderWidth:5] doSomething] doSomethingElse: 5]

Now has to be done in separate steps

   [aThing setBorderWidth: 5];
   [aThing doSometing];
   [aThing doSomethingElse: 5];

See?  This change ripples acrosss ObserverSwarm in lots of Swarm 1 projects.

Kirsten Donnet wrote:
> Hello,
>
> in trying to compile some of the example programs for Swarm, in those that contain 
> "setBorderWidth" such as BoolLib
> I get the following error message:
>
>
> > BoolNode.m: In function `-[BoolNode displayNodeState]':
> > BoolNode.m:136: warning: invalid receiver type `void '
> > BoolNode.m:136: warning: multiple declarations for method `setBorderWidth:'
> > /usr/local/include/gui.h:185: warning: using `-setBorderWidth:(int)width'
> > /usr/local/include/gui.h:785: warning: also found 
> > `-(void)setBorderWidth:(int)aVal'
> > BoolNode.m:136: error: void value not ignored as it ought to be
> > BoolNode.m:136: error: invalid use of void expression
> > BoolNode.m:140: warning: invalid receiver type `void '
> > BoolNode.m:140: warning: multiple declarations for method `setBorderWidth:'
> > /usr/local/include/gui.h:185: warning: using `-setBorderWidth:(int)width'
> > /usr/local/include/gui.h:785: warning: also found 
> > `-(void)setBorderWidth:(int)aVal'
> > BoolNode.m:140: error: void value not ignored as it ought to be
> > BoolNode.m:140: error: invalid use of void expression
> > make: *** [BoolNode.o] Error 1
>
>
> To get the program to run I just commented out these lines of code. For the 
> future
> could someone please tell me what is the correct way to handle "setBorderWidth"?
>
> cheers,
>
> Kirsten
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--
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ku.edu/~pauljohn
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