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 <edward.welbourne@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

2 files changed, 7 insertions, 18 deletions

diff --git a/examples/opengl/textures/glwidget.cpp b/examples/opengl/textures/glwidget.cpp
index 1644233614..307190f308 100644
--- a/examples/opengl/textures/glwidget.cpp
+++ b/examples/opengl/textures/glwidget.cpp
@@ -53,17 +53,6 @@
 #include <QOpenGLTexture>
 #include <QMouseEvent>
 
-GLWidget::GLWidget(QWidget *parent)
-    : QOpenGLWidget(parent),
-      clearColor(Qt::black),
-      xRot(0),
-      yRot(0),
-      zRot(0),
-      program(0)
-{
-    memset(textures, 0, sizeof(textures));
-}
-
 GLWidget::~GLWidget()
 {
     makeCurrent();
diff --git a/examples/opengl/textures/glwidget.h b/examples/opengl/textures/glwidget.h
index 0db2695c6a..585d44dbfe 100644
--- a/examples/opengl/textures/glwidget.h
+++ b/examples/opengl/textures/glwidget.h
@@ -63,7 +63,7 @@ class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions
     Q_OBJECT
 
 public:
-    explicit GLWidget(QWidget *parent = 0);
+    using QOpenGLWidget::QOpenGLWidget;
     ~GLWidget();
 
     QSize minimumSizeHint() const override;
@@ -85,13 +85,13 @@ protected:
 private:
     void makeObject();
 
-    QColor clearColor;
+    QColor clearColor = Qt::black;
     QPoint lastPos;
-    int xRot;
-    int yRot;
-    int zRot;
-    QOpenGLTexture *textures[6];
-    QOpenGLShaderProgram *program;
+    int xRot = 0;
+    int yRot = 0;
+    int zRot = 0;
+    QOpenGLTexture *textures[6] = {nullptr, nullptr, nullptr, nullptr, nullptr, nullptr};
+    QOpenGLShaderProgram *program = nullptr;
     QOpenGLBuffer vbo;
 };