Pass a pointer to the property data into the method evaluating a binding

Make it possible to evaluate the binding but write the result into
a different memory location. This will help support compat properties,
where the setter does a lot of additional work.

Change-Id: Ib60220eb629e3dcb5c0d7004b693e92290dfabe5
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/corelib/kernel/qproperty.h b/src/corelib/kernel/qproperty.h
index 14319f0382..c54d99f131 100644
--- a/src/corelib/kernel/qproperty.h
+++ b/src/corelib/kernel/qproperty.h
@@ -67,7 +67,7 @@ template <typename T>
 class QPropertyData : public QUntypedPropertyData
 {
 protected:
-    T val = T();
+    mutable T val = T();
 private:
     class DisableRValueRefs {};
 protected:
@@ -341,7 +341,7 @@ public:
     parameter_type value() const
     {
         if (d.hasBinding())
-            d.evaluateIfDirty();
+            d.evaluateIfDirty(this);
         d.registerWithCurrentlyEvaluatingBinding();
         return this->val;
     }