From b29e4570e7e3832a9923226c04ba43d630e91bd1 Mon Sep 17 00:00:00 2001
From: theraven <theraven@72102866-910b-0410-8b05-ffd578937521>
Date: Sat, 5 Sep 2009 17:43:13 +0000
Subject: [PATCH] Added enumeration mutation function, called by code
 automatically inserted by the compiler when a collection mutates during fast
 enumeration.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@28610 72102866-910b-0410-8b05-ffd578937521
---
 ChangeLog             |  4 ++++
 Source/NSEnumerator.m | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 38e53478c..e167bfd3e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2009-09-05 David Chisnall <csdavec@swan.ac.uk>
+
+	* Source/NSEnumberation.m: Added enumeration mutation callback.
+
 2009-09-03 Richard Frith-Macdonald <rfm@gnu.org>
 
 	* Source/NSLock.m: Fix a few variable declarations to work with older
diff --git a/Source/NSEnumerator.m b/Source/NSEnumerator.m
index 2893d4141..afe068d68 100644
--- a/Source/NSEnumerator.m
+++ b/Source/NSEnumerator.m
@@ -29,6 +29,8 @@
 #import "GNUstepBase/preface.h"
 #import "Foundation/NSArray.h"
 #import "Foundation/NSEnumerator.h"
+#include "Foundation/NSException.h"
+
 
 /**
  *  Simple class for iterating over a collection of objects, usually returned
@@ -96,3 +98,14 @@
   return len;
 }
 @end
+
+/**
+ * objc_enumerationMutation() is called whenever a collection mutates in the
+ * middle of fast enumeration.
+ */
+void objc_enumerationMutation(id obj)
+{
+	[NSException raise: NSGenericException 
+	               format: @"Collection %@ was mutated while being enumerated", 
+	                       obj];
+}