Symbol for max number of arguments in QMetaMethod::invoke()

QMetaMethod::invoke(..) takes fixed number of arguments for execution.
Adding preprocessor macros which literaly equals this number would be
useful for writing some generic code.

Task-number: QTBUG-31821
Change-Id: Ia2faf291f3f7df44a47c3cf18f5cd587d37d7d2e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/kernel/qmetaobject.cpp

@@ -1589,6 +1589,14 @@ bool QMetaObject::invokeMethod(QObject *obj,
     \internal
 */
 
+/*!
+    \macro Q_METAMETHOD_INVOKE_MAX_ARGS
+    \relates QMetaMethod
+
+    Equals maximum number of arguments available for
+    execution of the method via QMetaMethod::invoke()
+ */
+
 QByteArray QMetaMethodPrivate::signature() const
 {
     Q_ASSERT(priv(mobj->d.data)->revision >= 7);

src/corelib/kernel/qmetaobject.h

@@ -50,6 +50,8 @@ QT_BEGIN_NAMESPACE
 
 template <typename T> class QList;
 
+#define Q_METAMETHOD_INVOKE_MAX_ARGS 10
+
 class Q_CORE_EXPORT QMetaMethod
 {
 public: