Add a QBindingStorage class

QBindingStorage is a class that can store a set of binding objects
for the properties of a QObject. This will get used to reduce the
memory overhead of the property system when adding bindable properties
to QObject based classes.

The binding storage has a pointer to the TLS entry containing the
currently evaluating binding. Like that we avoid repeated TLS
lookups and reduce the overhead of the property system to one
pointer lookup and one compare for the case that properties
aren't being used.

Each QObject now owns one binding storage object, that can be used to
store binding data for properties that members of the QObject.

Change-Id: I27427c03c2ba281f072e074be96147bdbcaac246
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 5 insertions, 5 deletions

diff --git a/src/corelib/kernel/qproperty_p.h b/src/corelib/kernel/qproperty_p.h
index d93db988f9..1085c037e6 100644
--- a/src/corelib/kernel/qproperty_p.h
+++ b/src/corelib/kernel/qproperty_p.h
@@ -120,13 +120,13 @@ public:
     QString description;
 };
 
-struct BindingEvaluationState
+struct QBindingEvaluationState
 {
-    BindingEvaluationState(QPropertyBindingPrivate *binding);
-    ~BindingEvaluationState();
+    QBindingEvaluationState(QPropertyBindingPrivate *binding);
+    ~QBindingEvaluationState();
     QPropertyBindingPrivate *binding;
-    BindingEvaluationState *previousState = nullptr;
-    BindingEvaluationState **currentState = nullptr;
+    QBindingEvaluationState *previousState = nullptr;
+    QBindingEvaluationState **currentState = nullptr;
 };
 
 class Q_CORE_EXPORT QPropertyBindingPrivate : public QSharedData