invokeMethod: enable passing parameters to overload taking functors

This was missing for a while, and there is nothing fundamentally
missing for it to work.

With the more recent work around slot objects and invokeMethod in
general, it is a good time to add support for this.

In this patch, when connecting to a functor, it automatically deduces
the overload to call based on the arguments passed to invokeMethod.

Sharing code with QObject::connect could be done, but they have a
key difference that makes it harder:
With signal emissions we throw away trailing arguments that are not
used: i.e. `signal(int, int)` can be connected to `slot(int)` or
`slot()`. With invokeMethod that's not a thing. So we will need a way
to toggle that behavior during resolution.

[ChangeLog][QtCore][QMetaObject] Added support for passing parameters
to the overload of QMetaObject::invokeMethod that takes a functor. These
new overloads must have the return-value passed through qReturnArg().

Change-Id: If4fcbb75515b19e72fab80115c109efa37e6626e
Reviewed-by: Ievgenii Meshcheriakov <ievgenii.meshcheriakov@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/corelib/compat/removed_api.cpp b/src/corelib/compat/removed_api.cpp
index 088b418aef..a504bef17d 100644
--- a/src/corelib/compat/removed_api.cpp
+++ b/src/corelib/compat/removed_api.cpp
@@ -635,6 +635,13 @@ QString QLocale::bcp47Name() const
     return bcp47Name(TagSeparator::Dash);
 }
 
+#include "qobjectdefs.h"
+
+bool QMetaObject::invokeMethodImpl(QObject *object, QtPrivate::QSlotObjectBase *slot, Qt::ConnectionType type, void *ret)
+{
+    return invokeMethodImpl(object, slot, type, 1, &ret, nullptr, nullptr);
+}
+
 #include "qurl.h"
 
 QUrl QUrl::fromEncoded(const QByteArray &input, ParsingMode mode)