examples: Use QOverload to select overloaded signals and slots

We can use QOverload since Qt 5.7 (it depends on Q_COMPILER_VARIADIC_TEMPLATES
which is required since Qt 5.7).
Use it in the examples to show the best practice.
qOverload currently can't be used because it requires c++14.

Change-Id: I94a3c0db9d551fe169fa3d19c07ec0b329d5946c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/examples/opengl/qopenglwindow/main.cpp b/examples/opengl/qopenglwindow/main.cpp
index 4287d42d24..4f008b45a6 100644
--- a/examples/opengl/qopenglwindow/main.cpp
+++ b/examples/opengl/qopenglwindow/main.cpp
@@ -173,8 +173,6 @@ void OpenGLWindow::keyPressEvent(QKeyEvent *e)
 
 void OpenGLWindow::setAnimating(bool enabled)
 {
-    typedef void (QPaintDeviceWindow::*QPaintDeviceWindowVoidSlot)();
-
     if (enabled) {
         // Animate continuously, throttled by the blocking swapBuffers() call the
         // QOpenGLWindow internally executes after each paint. Once that is done
@@ -182,11 +180,11 @@ void OpenGLWindow::setAnimating(bool enabled)
         // obviously assumes that the swap interval (see
         // QSurfaceFormat::setSwapInterval()) is non-zero.
         connect(this, &QOpenGLWindow::frameSwapped,
-                this, static_cast<QPaintDeviceWindowVoidSlot>(&QPaintDeviceWindow::update));
+                this, QOverload<>::of(&QPaintDeviceWindow::update));
         update();
     } else {
         disconnect(this, &QOpenGLWindow::frameSwapped,
-                   this, static_cast<QPaintDeviceWindowVoidSlot>(&QPaintDeviceWindow::update));
+                   this, QOverload<>::of(&QPaintDeviceWindow::update));
     }
 }