Use move more consistently in QScopedValueRollback

Use move on the existing value as well so the constructor makes more
of a difference.

Change-Id: Iee2080da7b7d2d88eb108f0448c61423c7256979
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qscopedvaluerollback.h

@@ -48,20 +48,20 @@ template <typename T>
 class QScopedValueRollback
 {
 public:
-    explicit QScopedValueRollback(T &var) :
-        varRef(var), oldValue(var)
+    explicit QScopedValueRollback(T &var)
+        : varRef(var), oldValue(var)
     {
     }
 
-    explicit QScopedValueRollback(T &var, T value) :
-        varRef(var), oldValue(var)
+    explicit QScopedValueRollback(T &var, T value)
+        : varRef(var), oldValue(std::move(var))
     {
-        varRef = qMove(value);
+        varRef = std::move(value);
     }
 
     ~QScopedValueRollback()
     {
-        varRef = qMove(oldValue);
+        varRef = std::move(oldValue);
     }
 
     void commit()
@@ -70,7 +70,7 @@ public:
     }
 
 private:
-    T& varRef;
+    T &varRef;
     T oldValue;
 
     Q_DISABLE_COPY(QScopedValueRollback)

tests/auto/corelib/tools/qscopedvaluerollback/tst_qscopedvaluerollback.cpp

@@ -46,6 +46,7 @@ private Q_SLOTS:
     void rollbackToPreviousCommit();
     void exceptions();
     void earlyExitScope();
+    void moveOnly();
 private:
     void earlyExitScope_helper(int exitpoint, int &member);
 };
@@ -190,5 +191,17 @@ void tst_QScopedValueRollback::earlyExitScope_helper(int exitpoint, int& member)
     r.commit();
 }
 
+void tst_QScopedValueRollback::moveOnly()
+{
+    std::unique_ptr<int> uniquePtr;
+    std::unique_ptr<int> newVal(new int(5));
+    QVERIFY(!uniquePtr);
+    {
+        QScopedValueRollback<std::unique_ptr<int>> r(uniquePtr, std::move(newVal));
+        QVERIFY(uniquePtr);
+    }
+    QVERIFY(!uniquePtr);
+}
+
 QTEST_MAIN(tst_QScopedValueRollback)
 #include "tst_qscopedvaluerollback.moc"