Support move-only function objects in QObject::connect

[ChangeLog][QtCore][QObject] Added connect() support for move-only
function objects.

Task-number: QTBUG-60339
Change-Id: Iae5e48432bb64517b0607b0c2ba23931957f432e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
index db6bdf0809..89d6be6c7a 100644
--- a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
+++ b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
@@ -140,6 +140,7 @@ private slots:
     void connectFunctorWithContext();
     void connectFunctorWithContextUnique();
     void connectFunctorDeadlock();
+    void connectFunctorMoveOnly();
     void connectStaticSlotWithObject();
     void disconnectDoesNotLeakFunctor();
     void contextDoesNotLeakFunctor();
@@ -6237,6 +6238,47 @@ void tst_QObject::connectFunctorDeadlock()
     sender.emitSignal1();
 }
 
+void tst_QObject::connectFunctorMoveOnly()
+{
+    struct MoveOnlyFunctor {
+        Q_DISABLE_COPY(MoveOnlyFunctor)
+        MoveOnlyFunctor(int *status) : status(status) {}
+        MoveOnlyFunctor(MoveOnlyFunctor &&o) : status(o.status) { o.status = nullptr; };
+        void operator()(int i) { *status = i; }
+        void operator()() { *status = -8; }
+        int *status;
+    };
+
+    int status = 1;
+    SenderObject obj;
+    QEventLoop e;
+
+    connect(&obj, &SenderObject::signal1, MoveOnlyFunctor(&status));
+    QCOMPARE(status, 1);
+    obj.signal1();
+    QCOMPARE(status, -8);
+
+    connect(&obj, &SenderObject::signal7, MoveOnlyFunctor(&status));
+    QCOMPARE(status, -8);
+    obj.signal7(7888, "Hello");
+    QCOMPARE(status, 7888);
+
+    // With a context
+    status = 1;
+    connect(&obj, &SenderObject::signal2, this, MoveOnlyFunctor(&status));
+    QCOMPARE(status, 1);
+    obj.signal2();
+    QCOMPARE(status, -8);
+
+    // QueuedConnection
+    status = 1;
+    connect(&obj, &SenderObject::signal3, this, MoveOnlyFunctor(&status), Qt::QueuedConnection);
+    obj.signal3();
+    QCOMPARE(status, 1);
+    QCoreApplication::processEvents();
+    QCOMPARE(status, -8);
+}
+
 static int s_static_slot_checker = 1;
 
 class StaticSlotChecker : public QObject