diff -r dee5afe5301f -r 3f74d0d4af4c src/corelib/tools/qset.h
--- a/src/corelib/tools/qset.h	Mon Mar 15 12:43:09 2010 +0200
+++ b/src/corelib/tools/qset.h	Thu Apr 08 14:19:33 2010 +0300
@@ -97,7 +97,7 @@
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -132,7 +132,7 @@
 
     public:
         typedef std::bidirectional_iterator_tag iterator_category;
-        typedef ptrdiff_t difference_type;
+        typedef qptrdiff difference_type;
         typedef T value_type;
         typedef const T *pointer;
         typedef const T &reference;
@@ -188,11 +188,10 @@
     typedef const value_type *const_pointer;
     typedef value_type &reference;
     typedef const value_type &const_reference;
-    typedef ptrdiff_t difference_type;
+    typedef qptrdiff difference_type;
     typedef int size_type;
 
     inline bool empty() const { return isEmpty(); }
-
     // comfort
     inline QSet<T> &operator<<(const T &value) { insert(value); return *this; }
     inline QSet<T> &operator|=(const QSet<T> &other) { unite(other); return *this; }