Add PointerToMemberFunction for ctor of QSignalTransition

[ChangeLog][QtCore][State Machine] Added constructor overload that
takes a pointer-to-member for the QSignalTransition.

Change-Id: I80ac6e16d0edf7d2ab09882b6f6db4cbd73364e1
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/src/corelib/statemachine/qsignaltransition.cpp b/src/corelib/statemachine/qsignaltransition.cpp
index 7ec72df77c..e8c5f3e479 100644
--- a/src/corelib/statemachine/qsignaltransition.cpp
+++ b/src/corelib/statemachine/qsignaltransition.cpp
@@ -146,6 +146,19 @@ QSignalTransition::QSignalTransition(const QObject *sender, const char *signal,
 }
 
 /*!
+  \fn QSignalTransition::QSignalTransition(const QObject *sender,
+                       PointerToMemberFunction signal, QState *sourceState);
+  \since 5.7
+  \overload
+
+  Constructs a new signal transition associated with the given \a signal of
+  the given \a sender object and with the given \a sourceSate.
+  This constructor is enabled if compiler supports delegating constructor.
+
+  \sa Q_COMPILER_DELEGATING_CONSTRUCTORS
+*/
+
+/*!
   Destroys this signal transition.
 */
 QSignalTransition::~QSignalTransition()
diff --git a/src/corelib/statemachine/qsignaltransition.h b/src/corelib/statemachine/qsignaltransition.h
index c388323ec4..b428cb621d 100644
--- a/src/corelib/statemachine/qsignaltransition.h
+++ b/src/corelib/statemachine/qsignaltransition.h
@@ -35,6 +35,7 @@
 #define QSIGNALTRANSITION_H
 
 #include <QtCore/qabstracttransition.h>
+#include <QtCore/qmetaobject.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -52,6 +53,18 @@ public:
     QSignalTransition(QState *sourceState = Q_NULLPTR);
     QSignalTransition(const QObject *sender, const char *signal,
                       QState *sourceState = Q_NULLPTR);
+#ifdef Q_QDOC
+    QSignalTransition(const QObject *object, PointerToMemberFunction signal,
+                      QState *sourceState = Q_NULLPTR);
+#elif defined(Q_COMPILER_DELEGATING_CONSTRUCTORS)
+    template <typename Func>
+    QSignalTransition(const typename QtPrivate::FunctionPointer<Func>::Object *obj,
+                      Func sig, QState *srcState = Q_NULLPTR)
+    : QSignalTransition(obj, QMetaMethod::fromSignal(sig).methodSignature().constData(), srcState)
+    {
+    }
+#endif
+
     ~QSignalTransition();
 
     QObject *senderObject() const;