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      1 #import <Foundation/Foundation.h>
      2 #include <stdio.h>
      3 
      4 struct return_me
      5 {
      6   int first;
      7   int second;
      8 };
      9 
     10 @interface SourceBase: NSObject
     11 {
     12   struct return_me my_return;
     13 }
     14 - (SourceBase *) initWithFirst: (int) first andSecond: (int) second;
     15 - (void) randomMethod;
     16 - (struct return_me) returnsStruct;
     17 @end
     18 
     19 @implementation SourceBase
     20 - (void) randomMethod
     21 {
     22   printf ("Called in SourceBase version of randomMethod.\n"); // SourceBase randomMethod start line.
     23 }
     24 
     25 - (struct return_me) returnsStruct
     26 {
     27   return my_return; // SourceBase returnsStruct start line.
     28 }
     29 
     30 - (SourceBase *) initWithFirst: (int) first andSecond: (int) second
     31 {
     32   my_return.first = first;
     33   my_return.second = second;
     34 
     35   return self;
     36 }
     37 @end
     38 
     39 @interface Source : SourceBase
     40 {
     41   int _property;
     42 }
     43 - (void) setProperty: (int) newValue;
     44 - (void) randomMethod;
     45 - (struct return_me) returnsStruct;
     46 @end
     47 
     48 @implementation Source
     49 - (void) setProperty: (int) newValue
     50 {
     51   _property = newValue;
     52 }
     53 
     54 - (void) randomMethod
     55 {
     56   [super randomMethod];  // Source randomMethod start line.
     57     printf ("Called in Source version of random method.");
     58 }
     59 
     60 - (struct return_me) returnsStruct
     61 {
     62   printf ("Called in Source version of returnsStruct.\n");  // Source returnsStruct start line.
     63   return [super returnsStruct];                             // Source returnsStruct call line.  
     64 }
     65 
     66 @end
     67 
     68 @interface Observer : NSObject
     69 {
     70   Source *_source;
     71 }
     72 + (Observer *) observerWithSource: (Source *) source;
     73 - (Observer *) initWithASource: (Source *) source;
     74 - (void) observeValueForKeyPath: (NSString *) path 
     75 		       ofObject: (id) object
     76 			 change: (NSDictionary *) change
     77 			context: (void *) context;
     78 @end
     79 
     80 @implementation Observer
     81 
     82 + (Observer *) observerWithSource: (Source *) inSource;
     83 {
     84   Observer *retval;
     85 
     86   retval = [[Observer alloc] initWithASource: inSource];
     87   return retval;
     88 }
     89 
     90 - (Observer *) initWithASource: (Source *) source
     91 {
     92   [super init];
     93   _source = source;
     94   [_source addObserver: self 
     95 	    forKeyPath: @"property" 
     96 	    options: (NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld)
     97 	    context: NULL];
     98   return self;
     99 }
    100 
    101 - (void) observeValueForKeyPath: (NSString *) path 
    102 		       ofObject: (id) object
    103 			 change: (NSDictionary *) change
    104 			context: (void *) context
    105 {
    106   printf ("Observer function called.\n");
    107   return;
    108 }
    109 @end
    110 
    111 int main ()
    112 {
    113   Source *mySource;
    114   Observer *myObserver;
    115   struct return_me ret_val;
    116 
    117   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    118 
    119   mySource = [[Source alloc] init];
    120 
    121   [mySource randomMethod];               // Set first breakpoint here.
    122   ret_val = [mySource returnsStruct];    // Set second breakpoint here.
    123 
    124   myObserver = [Observer observerWithSource: mySource];  
    125 
    126   [mySource randomMethod];              // Set third breakpoint here.
    127   ret_val = [mySource returnsStruct];   // Set fourth breakpoint here.
    128   [mySource setProperty: 5];            // Set fifth breakpoint here.
    129 
    130   // We also had a bug where stepping into a method dispatch to nil turned
    131   // into continue.  So make sure that works here:
    132 
    133   mySource = nil;
    134   [mySource randomMethod];             // Set nil step breakpoint here.
    135   [pool release];                      // Step over nil should stop here.
    136   return 0;
    137 
    138 }
    139