--- a/Collection.st	Wed Aug 04 12:30:16 2010 +0200
+++ b/Collection.st	Thu Aug 05 13:52:37 2010 +0200
@@ -903,7 +903,7 @@
 !
 
 removeAll:aCollection
-    "remove all elements of the argument, aCollection from the receiver.
+    "remove all elements from the receiver which are equal to any in aCollection.
      Return the argument, aCollection.
      Raises an error, if some element-to-remove is not in the receiver.
      (see also: #removeAllFoundIn:, which does not raise an error).
@@ -941,12 +941,11 @@
      coll
     "
 
-
+    "Modified: / 05-08-2010 / 13:50:33 / cg"
 !
 
 removeAllFoundIn:aCollection 
-    "Remove each element of aCollection, which is present in the receiver
-     from the receiver.
+    "remove all elements from the receiver which are equal to any in aCollection.
      No error is raised, if some element-to-remove is not in the receiver.
      (see also: #removeAll:, which does raise an error)."
 
@@ -969,6 +968,76 @@
      coll
     "
 
+    "Modified: / 05-08-2010 / 13:51:05 / cg"
+!
+
+removeAllIdentical:aCollection
+    "remove all elements from the receiver which are in aCollection.
+     Return the argument, aCollection.
+     Raises an error, if some element-to-remove is not in the receiver.
+     (see also: #removeAllFoundIn:, which does not raise an error).
+
+     Notice: for some collections (those not tuned for
+             resizing themself) this may be very slow.
+             If the number of removed elements is big compared to to
+             the receivers size, it may be better to copy the
+             ones which are not to be removed into a new collection."
+
+    aCollection do:[:element | self removeIdentical:element].
+    ^ aCollection
+
+    "
+     |coll|
+
+     coll := #(1 2 3 4 5 6) asSet.
+     coll removeAll:#(4 5 6).
+     coll
+    "
+
+    "raises an error:
+     |coll|
+
+     coll := #(1 2 3 4 5 6) asSet.
+     coll removeAll:#(4 5 6 7 8).
+     coll
+    "
+
+    "no error raised:
+     |coll|
+
+     coll := #(1 2 3 4 5 6) asSet.
+     coll removeAllFoundIn:#(4 5 6 7 8).
+     coll
+    "
+
+    "Created: / 05-08-2010 / 13:51:51 / cg"
+!
+
+removeAllIdenticalFoundIn:aCollection 
+    "remove all elements from the receiver which are in aCollection.
+     No error is raised, if some element-to-remove is not in the receiver.
+     (see also: #removeAll:, which does raise an error)."
+
+    aCollection do:[:each | self removeIdentical:each ifAbsent:[]].
+    ^ aCollection
+
+    "
+     |coll|
+
+     coll := #(1 2 3 4 5 6) asSet.
+     coll removeAllFoundIn:#(4 5 6 7 8).
+     coll
+    "
+
+    "raises an error:
+     |coll|
+
+     coll := #(1 2 3 4 5 6) asSet.
+     coll removeAll:#(4 5 6 7 8).
+     coll
+    "
+
+    "Created: / 05-08-2010 / 13:52:21 / cg"
 !
 
 removeAllKeys:aCollection
@@ -3652,11 +3721,11 @@
 !Collection class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libbasic/Collection.st,v 1.244 2010-07-11 15:06:50 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic/Collection.st,v 1.245 2010-08-05 11:52:37 cg Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libbasic/Collection.st,v 1.244 2010-07-11 15:06:50 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic/Collection.st,v 1.245 2010-08-05 11:52:37 cg Exp $'
 ! !
 
 Collection initialize!