[MacRuby] #1129: Setting value of dereferenced pointer properties fails silently

26 Jan 2011

      #1129: Setting value of dereferenced pointer properties fails silently
---------------------------------+------------------------------------------
 Reporter:  dev@…                |       Owner:  lsansonetti@…        
     Type:  defect               |      Status:  new                  
 Priority:  major                |   Milestone:  MacRuby 1.0          
Component:  MacRuby              |    Keywords:                       
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 Orignal ML thread: http://lists.macosforge.org/pipermail/macruby-
 devel/2011-January/006944.html

 I suggest we either make it work or raise.

 For:

 {{{
 - (BOOL)isPartialStringValid:(NSString **)partialStringPtr
        proposedSelectedRange:(NSRangePointer)proposedSelRangePtr
               originalString:(NSString *)origString
        originalSelectedRange:(NSRange)origSelRange
             errorDescription:(NSString **)error
 }}}

 When subclassing NSFormatter in ruby, I define the method as:

 {{{
 def isPartialStringValid(partialStringPtr,
    proposedSelectedRange:proposedSelRangePtr,
           originalString:origString,
    originalSelectedRange:origSelRange,
         errorDescription:error)
 }}}

 When implementing the Cocoa Programming exercises in MacRuby, I ran across
 the following situation:

 At some point in that method definition, in the original code, Aaron sets
 the range properties directly:

 {{{
 proposedSelRangePtr->location = [*partialStringPtr length];
 proposedSelRangePtr->length   = [match length] -
 proposedSelRangePtr->location;
 }}}

 Initially, I did similar in MacRuby

 {{{
 proposedSelRangePtr[0].location = partialStringPtr[0].length
 proposedSelRangePtr[0].length   = match.length -
 proposedSelRangePtr[0].location
 }}}

 This has no effect. It does not raise, but the values go unchanged. I can
 NSLog the range values before and after and they're the same.

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/1129>
MacRuby <http://macruby.org/>