7 files changed, 14 insertions, 8 deletions
diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index ec1ea80e47..3e7421a290 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -369,7 +369,7 @@ ExecutionEngine::ExecutionEngine(EvalISelFactory *factory)
     static_cast<URIErrorPrototype *>(uRIErrorPrototype.getPointer())->init(this, uRIErrorCtor.asObject());
 
     static_cast<VariantPrototype *>(variantPrototype.getPointer())->init();
-    static_cast<SequencePrototype *>(sequencePrototype.managed())->init();
+    sequencePrototype.cast<SequencePrototype>()->init();
 
 
     // typed arrays
diff --git a/src/qml/jsruntime/qv4managed_p.h b/src/qml/jsruntime/qv4managed_p.h
index c73ad10230..c69eace865 100644
--- a/src/qml/jsruntime/qv4managed_p.h
+++ b/src/qml/jsruntime/qv4managed_p.h
@@ -326,8 +326,8 @@ public:
 
     void setVTable(const ManagedVTable *vt);
 
-    bool isEqualTo(Managed *other)
-    { return internalClass()->vtable->isEqualTo(this, other); }
+    bool isEqualTo(const Managed *other) const
+    { return internalClass()->vtable->isEqualTo(const_cast<Managed *>(this), const_cast<Managed *>(other)); }
 
     static bool isEqualTo(Managed *m, Managed *other);
 
diff --git a/src/qml/jsruntime/qv4runtime.cpp b/src/qml/jsruntime/qv4runtime.cpp
index 957f8cd42f..54b42c54fb 100644
--- a/src/qml/jsruntime/qv4runtime.cpp
+++ b/src/qml/jsruntime/qv4runtime.cpp
@@ -721,7 +721,7 @@ Bool RuntimeHelpers::strictEqual(const ValueRef x, const ValueRef y)
     if (x->isNumber())
         return y->isNumber() && x->asDouble() == y->asDouble();
     if (x->isManaged())
-        return y->isManaged() && x->managed()->isEqualTo(y->managed());
+        return y->isManaged() && x->cast<Managed>()->isEqualTo(y->cast<Managed>());
     return false;
 }
 
diff --git a/src/qml/jsruntime/qv4runtime_p.h b/src/qml/jsruntime/qv4runtime_p.h
index 6042420291..52a345f83e 100644
--- a/src/qml/jsruntime/qv4runtime_p.h
+++ b/src/qml/jsruntime/qv4runtime_p.h
@@ -470,7 +470,7 @@ inline Bool Runtime::compareEqual(const ValueRef left, const ValueRef right)
         if (!left->isManaged())
             return false;
         if (left->isString() == right->isString())
-            return left->managed()->isEqualTo(right->managed());
+            return left->cast<Managed>()->isEqualTo(right->cast<Managed>());
     }
 
     return RuntimeHelpers::equalHelper(left, right);
diff --git a/src/qml/jsruntime/qv4scopedvalue_p.h b/src/qml/jsruntime/qv4scopedvalue_p.h
index 5cc8495bba..f62dfeac6d 100644
--- a/src/qml/jsruntime/qv4scopedvalue_p.h
+++ b/src/qml/jsruntime/qv4scopedvalue_p.h
@@ -357,7 +357,7 @@ struct Scoped
     }
 
     T *operator->() {
-        return static_cast<T *>(ptr->managed());
+        return ptr->cast<T>();
     }
 
     bool operator!() const {
diff --git a/src/qml/jsruntime/qv4value_inl_p.h b/src/qml/jsruntime/qv4value_inl_p.h
index 045eaccfaf..7a6cdb40d2 100644
--- a/src/qml/jsruntime/qv4value_inl_p.h
+++ b/src/qml/jsruntime/qv4value_inl_p.h
@@ -56,13 +56,13 @@ inline bool Value::isString() const
 {
     if (!isManaged())
         return false;
-    return managed() && managed()->internalClass()->vtable->isString;
+    return m && static_cast<Managed::Data *>(m)->internalClass->vtable->isString;
 }
 inline bool Value::isObject() const
 {
     if (!isManaged())
         return false;
-    return managed() && managed()->internalClass()->vtable->isObject;
+    return m && static_cast<Managed::Data *>(m)->internalClass->vtable->isObject;
 }
 
 inline bool Value::isPrimitive() const
diff --git a/src/qml/jsruntime/qv4value_p.h b/src/qml/jsruntime/qv4value_p.h
index 9c6bd60792..e87a900267 100644
--- a/src/qml/jsruntime/qv4value_p.h
+++ b/src/qml/jsruntime/qv4value_p.h
@@ -329,6 +329,12 @@ struct Q_QML_PRIVATE_EXPORT Value
     inline ErrorObject *asErrorObject() const;
 
     template<typename T> inline T *as() const;
+    template<typename T> inline T *cast() {
+        return static_cast<T *>(managed());
+    }
+    template<typename T> inline const T *cast() const {
+        return static_cast<const T *>(managed());
+    }
 
     inline uint asArrayIndex() const;
     inline uint asArrayLength(bool *ok) const;