1 files changed, 14 insertions, 21 deletions
diff --git a/src/concurrent/qtconcurrentreducekernel.h b/src/concurrent/qtconcurrentreducekernel.h
index 694ac2b5a9c..333d358f189 100644
--- a/src/concurrent/qtconcurrentreducekernel.h
+++ b/src/concurrent/qtconcurrentreducekernel.h
@@ -41,6 +41,7 @@
 #define QTCONCURRENT_REDUCEKERNEL_H
 
 #include <QtConcurrent/qtconcurrent_global.h>
+#include <QtConcurrent/qtconcurrentfunctionwrappers.h>
 
 #if !defined(QT_NO_CONCURRENT) || defined(Q_CLANG_QDOC)
 
@@ -222,37 +223,29 @@ public:
 };
 
 template <typename Sequence, typename Base, typename Functor1, typename Functor2>
-struct SequenceHolder2 : public Base
+struct SequenceHolder2 : private QtPrivate::SequenceHolder<Sequence>, public Base
 {
-    SequenceHolder2(QThreadPool *pool,
-                    const Sequence &_sequence,
-                    Functor1 functor1,
-                    Functor2 functor2,
-                    ReduceOptions reduceOptions)
-        : Base(pool, _sequence.begin(), _sequence.end(), functor1, functor2, reduceOptions),
-          sequence(_sequence)
+    SequenceHolder2(QThreadPool *pool, const Sequence &_sequence, Functor1 functor1,
+                    Functor2 functor2, ReduceOptions reduceOptions)
+        : QtPrivate::SequenceHolder<Sequence>(_sequence),
+          Base(pool, this->sequence.cbegin(), this->sequence.cend(), functor1, functor2,
+               reduceOptions)
     { }
 
-    template <typename InitialValueType>
-    SequenceHolder2(QThreadPool *pool,
-                    const Sequence &_sequence,
-                    Functor1 functor1,
-                    Functor2 functor2,
-                    InitialValueType &&initialValue,
-                    ReduceOptions reduceOptions)
-        : Base(pool, _sequence.begin(), _sequence.end(), functor1, functor2,
-               std::forward<InitialValueType>(initialValue), reduceOptions),
-          sequence(_sequence)
+    template<typename InitialValueType>
+    SequenceHolder2(QThreadPool *pool, const Sequence &_sequence, Functor1 functor1,
+                    Functor2 functor2, InitialValueType &&initialValue, ReduceOptions reduceOptions)
+        : QtPrivate::SequenceHolder<Sequence>(_sequence),
+          Base(pool, this->sequence.cbegin(), this->sequence.cend(), functor1, functor2,
+               std::forward<InitialValueType>(initialValue), reduceOptions)
     { }
 
-    Sequence sequence;
-
     void finish() override
     {
         Base::finish();
         // Clear the sequence to make sure all temporaries are destroyed
         // before finished is signaled.
-        sequence = Sequence();
+        this->sequence = Sequence();
     }
 };