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Simple messages problem
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Simple messages problem


  • Subject: Simple messages problem
  • From: "K. Darcy Otto" <email@hidden>
  • Date: Thu, 20 Mar 2008 15:25:34 -0700

So, I seem to be having a problem with the following code, and I think I've traced it to how the messages are nested; but I cannot seem to solve it. Consider the following code, which works without warnings (self.sequent is an NSArray):

DeductionLine *dl1 = [self.sequent objectAtIndex:lineCount-1];
Justification *j1 = [dl1 justification];
NSString *rule1 = [j1 rule];

But the following line generates a warning: NSString may not respond to -rule.


NSString *rule2 = [[[self.sequent objectAtIndex:lineCount-1] justification] rule];

I'm confused about the warning, because [[self.sequent objectAtIndex:lineCount-1] justification] returns type Justification, not NSString. Both examples compile and work; but the warning is in the second case only. Why, and how can I get rid of the warning? Any help would be appreciated. (I think I've included everything necessary to diagnose the problem; please let me know if I haven't; all of this is under Objective-C 2.0 with @synthesize sequent in DeductionLine.)
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