Cleanup QtOpenGL examples

Cleanup the OpenGL examples
 - use nullptr (clang-tidy)
 - use member-initialization
 - avoid redundant checks for != nullptr when deleting a pointer

Change-Id: I3e4702690ed79e71c3e952d51ceef83b907b45b7
Reviewed-by: Edward Welbourne <[email protected]>
Reviewed-by: Laszlo Agocs <[email protected]>

1 files changed, 5 insertions, 3 deletions

diff --git a/examples/opengl/hellogl2/window.cpp b/examples/opengl/hellogl2/window.cpp
index c3cd10cbfd3..5534f2edea1 100644
--- a/examples/opengl/hellogl2/window.cpp
+++ b/examples/opengl/hellogl2/window.cpp
@@ -121,7 +121,7 @@ void Window::keyPressEvent(QKeyEvent *e)
 void Window::dockUndock()
 {
     if (parent()) {
-        setParent(0);
+        setParent(nullptr);
         setAttribute(Qt::WA_DeleteOnClose);
         move(QApplication::desktop()->width() / 2 - width() / 2,
              QApplication::desktop()->height() / 2 - height() / 2);
@@ -134,10 +134,12 @@ void Window::dockUndock()
                 dockBtn->setText(tr("Undock"));
                 mainWindow->setCentralWidget(this);
             } else {
-                QMessageBox::information(0, tr("Cannot dock"), tr("Main window already closed"));
+                QMessageBox::information(nullptr, tr("Cannot dock"),
+                                         tr("Main window already closed"));
             }
         } else {
-            QMessageBox::information(0, tr("Cannot dock"), tr("Main window already occupied"));
+            QMessageBox::information(nullptr, tr("Cannot dock"),
+                                     tr("Main window already occupied"));
         }
     }
 }