[bug #6743] Distinct NSNumbers with the same value dealloc each other

[nobody]

=================== BUG #6743: FULL BUG SNAPSHOT ===================
http://savannah.gnu.org/bugs/?func=detailbug&bug_id=6743&group_id=99

Submitted by: moseshall               Project: GNUstep                      
Submitted on: Tue 11/25/2003 at 03:06
Category:  Base/Foundation            Severity:  5 - Major                  
Bug Group:  Bug                       Resolution:  None                     
Assigned to:  None                    Status:  Open                         

Summary:  Distinct NSNumbers with the same value dealloc each other

Original Submission:  Distinct NSNumbers with the *same value* can dealloc each 
other. The following code snippet crashes gnustep-base 1.7.3 possibly because 
of NSNumber caching. If I don't call [n1 release] there is no crash. If this is 
due to caching strategy, then it can make NSNumber very fragile when numbers 
are expected to persist as long as retained.



#include <Foundation/Foundation.h>



int main (int argc, const char *argv[], const char *env[]) 

{

  NSNumber* n1 = [NSNumber numberWithLong:1];

  NSNumber* n2 = [NSNumber numberWithLong:1];

  NSLog(@"%@(%d)n", n1, [n1 retainCount]);

  NSLog(@"%@(%d)n", n2, [n2 retainCount]);

  [n1 release]; //<--problem here

  // The next line crashes. n2 has gone away!

  NSLog(@"%@(%d)n", n2, [n2 retainCount]);

  return 0;

}



Thanks for your attention.

Brian 'Moses' Hall

moses@blugs.com



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