--- a/src/corelib/tools/qhash.h	Mon Jun 21 22:38:13 2010 +0100
+++ b/src/corelib/tools/qhash.h	Thu Jul 22 16:41:55 2010 +0100
@@ -299,6 +299,7 @@
     inline void detach() { if (d->ref != 1) detach_helper(); }
     inline bool isDetached() const { return d->ref == 1; }
     inline void setSharable(bool sharable) { if (!sharable) detach(); d->sharable = sharable; }
+    inline bool isSharedWith(const QHash<Key, T> &other) const { return d == other.d; }
 
     void clear();
 
@@ -624,6 +625,7 @@
 Q_OUTOFLINE_TEMPLATE QList<Key> QHash<Key, T>::uniqueKeys() const
 {
     QList<Key> res;
+    res.reserve(size()); // May be too much, but assume short lifetime
     const_iterator i = begin();
     if (i != end()) {
         for (;;) {
@@ -643,6 +645,7 @@
 Q_OUTOFLINE_TEMPLATE QList<Key> QHash<Key, T>::keys() const
 {
     QList<Key> res;
+    res.reserve(size());
     const_iterator i = begin();
     while (i != end()) {
         res.append(i.key());
@@ -687,6 +690,7 @@
 Q_OUTOFLINE_TEMPLATE QList<T> QHash<Key, T>::values() const
 {
     QList<T> res;
+    res.reserve(size());
     const_iterator i = begin();
     while (i != end()) {
         res.append(i.value());