More nullptr usage in headers

Diff generated by running clang-tidy's modernize-use-nullptr checker on
the CMake-based Qt version.

Skipping src/3rdparty, examples/, tests/

Change-Id: Ib182074e2e2fd52f63093f73b3e2e4c0cb7af188
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

52 files changed, 159 insertions, 159 deletions

diff --git a/src/gui/accessible/qaccessiblecache_p.h b/src/gui/accessible/qaccessiblecache_p.h
index a976277c1d..cf1ed04f35 100644
--- a/src/gui/accessible/qaccessiblecache_p.h
+++ b/src/gui/accessible/qaccessiblecache_p.h
@@ -73,7 +73,7 @@ public:
     QAccessibleInterface *interfaceForId(QAccessible::Id id) const;
     QAccessible::Id idForInterface(QAccessibleInterface *iface) const;
     QAccessible::Id insert(QObject *object, QAccessibleInterface *iface) const;
-    void deleteInterface(QAccessible::Id id, QObject *obj = 0);
+    void deleteInterface(QAccessible::Id id, QObject *obj = nullptr);
 
 #ifdef Q_OS_MAC
     QT_MANGLE_NAMESPACE(QMacAccessibilityElement) *elementForId(QAccessible::Id axid) const;
diff --git a/src/gui/image/qimage_p.h b/src/gui/image/qimage_p.h
index a599fc17c9..1e0578a0f4 100644
--- a/src/gui/image/qimage_p.h
+++ b/src/gui/image/qimage_p.h
@@ -67,7 +67,7 @@ struct Q_GUI_EXPORT QImageData {        // internal image data
     QImageData();
     ~QImageData();
     static QImageData *create(const QSize &size, QImage::Format format);
-    static QImageData *create(uchar *data, int w, int h,  int bpl, QImage::Format format, bool readOnly, QImageCleanupFunction cleanupFunction = 0, void *cleanupInfo = 0);
+    static QImageData *create(uchar *data, int w, int h,  int bpl, QImage::Format format, bool readOnly, QImageCleanupFunction cleanupFunction = nullptr, void *cleanupInfo = nullptr);
 
     QAtomicInt ref;
 
diff --git a/src/gui/image/qpixmapcache_p.h b/src/gui/image/qpixmapcache_p.h
index 3c57367514..ab8e2b7558 100644
--- a/src/gui/image/qpixmapcache_p.h
+++ b/src/gui/image/qpixmapcache_p.h
@@ -87,7 +87,7 @@ public:
                 && !d->image.d->paintEngine->isActive())
             {
                 delete d->image.d->paintEngine;
-                d->image.d->paintEngine = 0;
+                d->image.d->paintEngine = nullptr;
             }
         }
     }
diff --git a/src/gui/image/qppmhandler_p.h b/src/gui/image/qppmhandler_p.h
index f3c9d0f139..2f3811b759 100644
--- a/src/gui/image/qppmhandler_p.h
+++ b/src/gui/image/qppmhandler_p.h
@@ -71,7 +71,7 @@ public:
     QByteArray name() const override;
 #endif
 
-    static bool canRead(QIODevice *device, QByteArray *subType = 0);
+    static bool canRead(QIODevice *device, QByteArray *subType = nullptr);
 
     QVariant option(ImageOption option) const override;
     void setOption(ImageOption option, const QVariant &value) override;
diff --git a/src/gui/itemmodels/qstandarditemmodel_p.h b/src/gui/itemmodels/qstandarditemmodel_p.h
index 23d2938bc4..97c2e6f01b 100644
--- a/src/gui/itemmodels/qstandarditemmodel_p.h
+++ b/src/gui/itemmodels/qstandarditemmodel_p.h
@@ -109,11 +109,11 @@ class QStandardItemPrivate
     Q_DECLARE_PUBLIC(QStandardItem)
 public:
     inline QStandardItemPrivate()
-        : model(0),
-          parent(0),
+        : model(nullptr),
+          parent(nullptr),
           rows(0),
           columns(0),
-          q_ptr(0),
+          q_ptr(nullptr),
           lastKnownIndex(-1)
         { }
 
@@ -220,10 +220,10 @@ public:
         if (!index.isValid())
             return root.data();
         if (index.model() != q)
-            return 0;
+            return nullptr;
         QStandardItem *parent = static_cast<QStandardItem*>(index.internalPointer());
-        if (parent == 0)
-            return 0;
+        if (parent == nullptr)
+            return nullptr;
         return parent->child(index.row(), index.column());
     }
 
diff --git a/src/gui/kernel/qdnd_p.h b/src/gui/kernel/qdnd_p.h
index 8f8eb03f87..b1219c8658 100644
--- a/src/gui/kernel/qdnd_p.h
+++ b/src/gui/kernel/qdnd_p.h
@@ -73,9 +73,9 @@ class QDragPrivate : public QObjectPrivate
 {
 public:
     QDragPrivate()
-        : source(0)
-        , target(0)
-        , data(0)
+        : source(nullptr)
+        , target(nullptr)
+        , data(nullptr)
     { }
     QObject *source;
     QObject *target;
diff --git a/src/gui/kernel/qguiapplication_p.h b/src/gui/kernel/qguiapplication_p.h
index 61d9661286..65afa5de1b 100644
--- a/src/gui/kernel/qguiapplication_p.h
+++ b/src/gui/kernel/qguiapplication_p.h
@@ -115,7 +115,7 @@ public:
         if (QCoreApplication::instance())
             return QCoreApplication::instance()->d_func()->threadData->eventDispatcher.load();
         else
-            return 0;
+            return nullptr;
     }
 
     static void processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent *e);
@@ -205,7 +205,7 @@ public:
     static void showModalWindow(QWindow *window);
     static void hideModalWindow(QWindow *window);
     static void updateBlockedStatus(QWindow *window);
-    virtual bool isWindowBlocked(QWindow *window, QWindow **blockingWindow = 0) const;
+    virtual bool isWindowBlocked(QWindow *window, QWindow **blockingWindow = nullptr) const;
     virtual bool popupActive() { return false; }
 
     static ulong mousePressTime;
diff --git a/src/gui/kernel/qinputmethod_p.h b/src/gui/kernel/qinputmethod_p.h
index 0c2b739d92..5657edeb4e 100644
--- a/src/gui/kernel/qinputmethod_p.h
+++ b/src/gui/kernel/qinputmethod_p.h
@@ -67,7 +67,7 @@ class QInputMethodPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QInputMethod)
 
 public:
-    inline QInputMethodPrivate() : testContext(0)
+    inline QInputMethodPrivate() : testContext(nullptr)
     {}
     QPlatformInputContext *platformInputContext() const
     {
diff --git a/src/gui/kernel/qopenglcontext_p.h b/src/gui/kernel/qopenglcontext_p.h
index 2849d0c58e..c6ad893ee6 100644
--- a/src/gui/kernel/qopenglcontext_p.h
+++ b/src/gui/kernel/qopenglcontext_p.h
@@ -131,7 +131,7 @@ class Q_GUI_EXPORT QOpenGLContextGroupPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QOpenGLContextGroup)
 public:
     QOpenGLContextGroupPrivate()
-        : m_context(0)
+        : m_context(nullptr)
         , m_mutex(QMutex::Recursive)
         , m_refs(0)
     {
@@ -198,20 +198,20 @@ class Q_GUI_EXPORT QOpenGLContextPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QOpenGLContext)
 public:
     QOpenGLContextPrivate()
-        : qGLContextHandle(0)
-        , qGLContextDeleteFunction(0)
-        , platformGLContext(0)
-        , shareContext(0)
-        , shareGroup(0)
-        , screen(0)
-        , surface(0)
-        , functions(0)
-        , textureFunctions(0)
+        : qGLContextHandle(nullptr)
+        , qGLContextDeleteFunction(nullptr)
+        , platformGLContext(nullptr)
+        , shareContext(nullptr)
+        , shareGroup(nullptr)
+        , screen(nullptr)
+        , surface(nullptr)
+        , functions(nullptr)
+        , textureFunctions(nullptr)
         , max_texture_size(-1)
         , workaround_brokenFBOReadBack(false)
         , workaround_brokenTexSubImage(false)
         , workaround_missingPrecisionQualifiers(false)
-        , active_engine(0)
+        , active_engine(nullptr)
         , qgl_current_fbo_invalid(false)
         , qgl_current_fbo(nullptr)
         , defaultFboRedirect(0)
diff --git a/src/gui/kernel/qplatformintegration.h b/src/gui/kernel/qplatformintegration.h
index de5f9c1c9a..8ece390420 100644
--- a/src/gui/kernel/qplatformintegration.h
+++ b/src/gui/kernel/qplatformintegration.h
@@ -114,7 +114,7 @@ public:
 
     virtual QPlatformPixmap *createPlatformPixmap(QPlatformPixmap::PixelType type) const;
     virtual QPlatformWindow *createPlatformWindow(QWindow *window) const = 0;
-    virtual QPlatformWindow *createForeignWindow(QWindow *, WId) const { return 0; }
+    virtual QPlatformWindow *createForeignWindow(QWindow *, WId) const { return nullptr; }
     virtual QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const = 0;
 #ifndef QT_NO_OPENGL
     virtual QPlatformOpenGLContext *createPlatformOpenGLContext(QOpenGLContext *context) const;
diff --git a/src/gui/kernel/qplatformtheme.h b/src/gui/kernel/qplatformtheme.h
index 54c8c70025..356c4ea3ea 100644
--- a/src/gui/kernel/qplatformtheme.h
+++ b/src/gui/kernel/qplatformtheme.h
@@ -309,7 +309,7 @@ public:
 
     virtual QPixmap standardPixmap(StandardPixmap sp, const QSizeF &size) const;
     virtual QIcon fileIcon(const QFileInfo &fileInfo,
-                           QPlatformTheme::IconOptions iconOptions = 0) const;
+                           QPlatformTheme::IconOptions iconOptions = nullptr) const;
     virtual QIconEngine *createIconEngine(const QString &iconName) const;
 
 #ifndef QT_NO_SHORTCUT
diff --git a/src/gui/kernel/qscreen_p.h b/src/gui/kernel/qscreen_p.h
index f31658355b..8e81c7bf87 100644
--- a/src/gui/kernel/qscreen_p.h
+++ b/src/gui/kernel/qscreen_p.h
@@ -65,8 +65,8 @@ class QScreenPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QScreen)
 public:
     QScreenPrivate()
-        : platformScreen(0)
-        , orientationUpdateMask(0)
+        : platformScreen(nullptr)
+        , orientationUpdateMask(nullptr)
     {
     }
 
diff --git a/src/gui/kernel/qshapedpixmapdndwindow_p.h b/src/gui/kernel/qshapedpixmapdndwindow_p.h
index d9a6ea4888..5089be7284 100644
--- a/src/gui/kernel/qshapedpixmapdndwindow_p.h
+++ b/src/gui/kernel/qshapedpixmapdndwindow_p.h
@@ -63,7 +63,7 @@ class QShapedPixmapWindow : public QRasterWindow
 {
     Q_OBJECT
 public:
-    explicit QShapedPixmapWindow(QScreen *screen = 0);
+    explicit QShapedPixmapWindow(QScreen *screen = nullptr);
     ~QShapedPixmapWindow();
 
     void setUseCompositing(bool on) { m_useCompositing = on; }
diff --git a/src/gui/kernel/qwindow_p.h b/src/gui/kernel/qwindow_p.h
index 25f9a8a9b2..1098321135 100644
--- a/src/gui/kernel/qwindow_p.h
+++ b/src/gui/kernel/qwindow_p.h
@@ -79,8 +79,8 @@ public:
         : QObjectPrivate()
         , surfaceType(QWindow::RasterSurface)
         , windowFlags(Qt::Window)
-        , parentWindow(0)
-        , platformWindow(0)
+        , parentWindow(nullptr)
+        , platformWindow(nullptr)
         , visible(false)
         , visibilityOnDestroy(false)
         , exposed(false)
@@ -97,8 +97,8 @@ public:
         , modality(Qt::NonModal)
         , blockedByModalWindow(false)
         , updateRequestPending(false)
-        , transientParent(0)
-        , topLevelScreen(0)
+        , transientParent(nullptr)
+        , topLevelScreen(nullptr)
 #ifndef QT_NO_CURSOR
         , cursor(Qt::ArrowCursor)
         , hasCursor(false)
@@ -119,7 +119,7 @@ public:
 
     void maybeQuitOnLastWindowClosed();
 #ifndef QT_NO_CURSOR
-    void setCursor(const QCursor *c = 0);
+    void setCursor(const QCursor *c = nullptr);
     bool applyCursor();
 #endif
 
diff --git a/src/gui/kernel/qwindowsysteminterface_p.h b/src/gui/kernel/qwindowsysteminterface_p.h
index 6c818a9030..d6513f1836 100644
--- a/src/gui/kernel/qwindowsysteminterface_p.h
+++ b/src/gui/kernel/qwindowsysteminterface_p.h
@@ -123,7 +123,7 @@ public:
 
     class CloseEvent : public WindowSystemEvent {
     public:
-        explicit CloseEvent(QWindow *w, bool *a = 0)
+        explicit CloseEvent(QWindow *w, bool *a = nullptr)
             : WindowSystemEvent(Close), window(w), accepted(a)
             { }
         QPointer<QWindow> window;
@@ -398,7 +398,7 @@ public:
     class TabletEnterProximityEvent : public InputEvent {
     public:
         TabletEnterProximityEvent(ulong time, int device, int pointerType, qint64 uid)
-            : InputEvent(0, time, TabletEnterProximity, Qt::NoModifier),
+            : InputEvent(nullptr, time, TabletEnterProximity, Qt::NoModifier),
               device(device), pointerType(pointerType), uid(uid) { }
         int device;
         int pointerType;
@@ -408,7 +408,7 @@ public:
     class TabletLeaveProximityEvent : public InputEvent {
     public:
         TabletLeaveProximityEvent(ulong time, int device, int pointerType, qint64 uid)
-            : InputEvent(0, time, TabletLeaveProximity, Qt::NoModifier),
+            : InputEvent(nullptr, time, TabletLeaveProximity, Qt::NoModifier),
               device(device), pointerType(pointerType), uid(uid) { }
         int device;
         int pointerType;
@@ -474,7 +474,7 @@ public:
             for (int i = 0; i < impl.size(); ++i)
                 if (!(impl.at(i)->type & QWindowSystemInterfacePrivate::UserInputEvent))
                     return impl.takeAt(i);
-            return 0;
+            return nullptr;
         }
         bool nonUserInputEventsQueued()
         {
@@ -495,7 +495,7 @@ public:
                 if (impl.at(i)->type == t)
                     return impl.at(i);
             }
-            return 0;
+            return nullptr;
         }
         void remove(const WindowSystemEvent *e)
         {
diff --git a/src/gui/opengl/qopenglengineshadermanager_p.h b/src/gui/opengl/qopenglengineshadermanager_p.h
index d43788d777..14c79f5de3 100644
--- a/src/gui/opengl/qopenglengineshadermanager_p.h
+++ b/src/gui/opengl/qopenglengineshadermanager_p.h
@@ -370,7 +370,7 @@ private:
 class QOpenGLEngineShaderProg
 {
 public:
-    QOpenGLEngineShaderProg() : program(0) {}
+    QOpenGLEngineShaderProg() : program(nullptr) {}
 
     ~QOpenGLEngineShaderProg() {
         if (program)
diff --git a/src/gui/opengl/qopenglextensions_p.h b/src/gui/opengl/qopenglextensions_p.h
index af8ee8201d..137f1e831f 100644
--- a/src/gui/opengl/qopenglextensions_p.h
+++ b/src/gui/opengl/qopenglextensions_p.h
@@ -107,7 +107,7 @@ public:
     QOpenGLExtensionsPrivate *d() const;
 
 private:
-    static bool isInitialized(const QOpenGLFunctionsPrivate *d) { return d != 0; }
+    static bool isInitialized(const QOpenGLFunctionsPrivate *d) { return d != nullptr; }
 };
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(QOpenGLExtensions::OpenGLExtensions)
diff --git a/src/gui/opengl/qopenglframebufferobject_p.h b/src/gui/opengl/qopenglframebufferobject_p.h
index 778a38b823..644bb6c59b 100644
--- a/src/gui/opengl/qopenglframebufferobject_p.h
+++ b/src/gui/opengl/qopenglframebufferobject_p.h
@@ -109,8 +109,8 @@ public:
 class QOpenGLFramebufferObjectPrivate
 {
 public:
-    QOpenGLFramebufferObjectPrivate() : fbo_guard(0), depth_buffer_guard(0)
-                                  , stencil_buffer_guard(0)
+    QOpenGLFramebufferObjectPrivate() : fbo_guard(nullptr), depth_buffer_guard(nullptr)
+                                  , stencil_buffer_guard(nullptr)
                                   , valid(false) {}
     ~QOpenGLFramebufferObjectPrivate() {}
 
@@ -135,9 +135,9 @@ public:
     QOpenGLExtensions funcs;
 
     struct ColorAttachment {
-        ColorAttachment() : internalFormat(0), guard(0) { }
+        ColorAttachment() : internalFormat(0), guard(nullptr) { }
         ColorAttachment(const QSize &size, GLenum internalFormat)
-            : size(size), internalFormat(internalFormat), guard(0) { }
+            : size(size), internalFormat(internalFormat), guard(nullptr) { }
         QSize size;
         GLenum internalFormat;
         QOpenGLSharedResourceGuard *guard;
diff --git a/src/gui/opengl/qopenglpaintengine_p.h b/src/gui/opengl/qopenglpaintengine_p.h
index 15ac240b89..81f17572b2 100644
--- a/src/gui/opengl/qopenglpaintengine_p.h
+++ b/src/gui/opengl/qopenglpaintengine_p.h
@@ -187,9 +187,9 @@ public:
 
     QOpenGL2PaintEngineExPrivate(QOpenGL2PaintEngineEx *q_ptr) :
             q(q_ptr),
-            shaderManager(0),
+            shaderManager(nullptr),
             width(0), height(0),
-            ctx(0),
+            ctx(nullptr),
             useSystemClip(true),
             elementIndicesVBOId(0),
             opacityArray(0),
@@ -361,9 +361,9 @@ void QOpenGL2PaintEngineExPrivate::uploadData(unsigned int arrayIndex, const GLf
             opacityBuffer.allocate(data, count * sizeof(float));
         }
         if (arrayIndex == QT_OPACITY_ATTR)
-            funcs.glVertexAttribPointer(arrayIndex, 1, GL_FLOAT, GL_FALSE, 0, 0);
+            funcs.glVertexAttribPointer(arrayIndex, 1, GL_FLOAT, GL_FALSE, 0, nullptr);
         else
-            funcs.glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, 0);
+            funcs.glVertexAttribPointer(arrayIndex, 2, GL_FLOAT, GL_FALSE, 0, nullptr);
     } else {
         // If we already uploaded the data we don't have to do it again
         if (data == vertexAttribPointers[arrayIndex])
diff --git a/src/gui/opengl/qopenglqueryhelper_p.h b/src/gui/opengl/qopenglqueryhelper_p.h
index 60dbf9c743..ad91ca9f96 100644
--- a/src/gui/opengl/qopenglqueryhelper_p.h
+++ b/src/gui/opengl/qopenglqueryhelper_p.h
@@ -65,18 +65,18 @@ class QOpenGLQueryHelper
 {
 public:
     QOpenGLQueryHelper(QOpenGLContext *context)
-        : GetQueryObjectuiv(0),
-          GetQueryObjectiv(0),
-          GetQueryiv(0),
-          EndQuery(0),
-          BeginQuery(0),
-          IsQuery(0),
-          DeleteQueries(0),
-          GenQueries(0),
-          GetInteger64v(0),
-          GetQueryObjectui64v(0),
-          GetQueryObjecti64v(0),
-          QueryCounter(0)
+        : GetQueryObjectuiv(nullptr),
+          GetQueryObjectiv(nullptr),
+          GetQueryiv(nullptr),
+          EndQuery(nullptr),
+          BeginQuery(nullptr),
+          IsQuery(nullptr),
+          DeleteQueries(nullptr),
+          GenQueries(nullptr),
+          GetInteger64v(nullptr),
+          GetQueryObjectui64v(nullptr),
+          GetQueryObjecti64v(nullptr),
+          QueryCounter(nullptr)
     {
         Q_ASSERT(context);
 
diff --git a/src/gui/opengl/qopengltextureglyphcache_p.h b/src/gui/opengl/qopengltextureglyphcache_p.h
index 598cb00ee5..aed128cf9e 100644
--- a/src/gui/opengl/qopengltextureglyphcache_p.h
+++ b/src/gui/opengl/qopengltextureglyphcache_p.h
@@ -139,7 +139,7 @@ public:
 
     inline void setPaintEnginePrivate(QOpenGL2PaintEngineExPrivate *p) { pex = p; }
 
-    inline const QOpenGLContextGroup *contextGroup() const { return m_textureResource ? m_textureResource->group() : 0; }
+    inline const QOpenGLContextGroup *contextGroup() const { return m_textureResource ? m_textureResource->group() : nullptr; }
 
     inline int serialNumber() const { return m_serialNumber; }
 
diff --git a/src/gui/opengl/qopengltexturehelper_p.h b/src/gui/opengl/qopengltexturehelper_p.h
index 00f6f9e5aa..62d0125daf 100644
--- a/src/gui/opengl/qopengltexturehelper_p.h
+++ b/src/gui/opengl/qopengltexturehelper_p.h
@@ -167,7 +167,7 @@ public:
 
     inline void glTextureSubImage3D(GLuint texture, GLenum target, GLenum bindingTarget, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
                                     GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
-                                    const GLvoid *pixels, const QOpenGLPixelTransferOptions * const options = 0)
+                                    const GLvoid *pixels, const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
@@ -181,7 +181,7 @@ public:
 
     inline void glTextureSubImage2D(GLuint texture, GLenum target, GLenum bindingTarget, GLint level, GLint xoffset, GLint yoffset,
                                     GLsizei width, GLsizei height, GLenum format, GLenum type,
-                                    const GLvoid *pixels, const QOpenGLPixelTransferOptions * const options = 0)
+                                    const GLvoid *pixels, const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
@@ -195,7 +195,7 @@ public:
 
     inline void glTextureSubImage1D(GLuint texture, GLenum target, GLenum bindingTarget, GLint level, GLint xoffset,
                                     GLsizei width, GLenum format, GLenum type,
-                                    const GLvoid *pixels, const QOpenGLPixelTransferOptions * const options = 0)
+                                    const GLvoid *pixels, const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
@@ -222,7 +222,7 @@ public:
     inline void glCompressedTextureSubImage1D(GLuint texture, GLenum target, GLenum bindingTarget, GLint level,
                                               GLint xoffset, GLsizei width,
                                               GLenum format, GLsizei imageSize, const GLvoid *bits,
-                                              const QOpenGLPixelTransferOptions * const options = 0)
+                                              const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
@@ -238,7 +238,7 @@ public:
                                               GLint xoffset, GLint yoffset,
                                               GLsizei width, GLsizei height,
                                               GLenum format, GLsizei imageSize, const GLvoid *bits,
-                                              const QOpenGLPixelTransferOptions * const options = 0)
+                                              const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
@@ -254,7 +254,7 @@ public:
                                               GLint xoffset, GLint yoffset, GLint zoffset,
                                               GLsizei width, GLsizei height, GLsizei depth,
                                               GLenum format, GLsizei imageSize, const GLvoid *bits,
-                                              const QOpenGLPixelTransferOptions * const options = 0)
+                                              const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
@@ -269,7 +269,7 @@ public:
     inline void glCompressedTextureImage1D(GLuint texture, GLenum target, GLenum bindingTarget, GLint level,
                                            GLenum internalFormat, GLsizei width,
                                            GLint border, GLsizei imageSize, const GLvoid *bits,
-                                           const QOpenGLPixelTransferOptions * const options = 0)
+                                           const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
@@ -284,7 +284,7 @@ public:
     inline void glCompressedTextureImage2D(GLuint texture, GLenum target, GLenum bindingTarget, GLint level,
                                            GLenum internalFormat, GLsizei width, GLsizei height,
                                            GLint border, GLsizei imageSize, const GLvoid *bits,
-                                           const QOpenGLPixelTransferOptions * const options = 0)
+                                           const QOpenGLPixelTransferOptions * const options = nullptr)
 
     {
         if (options) {
@@ -300,7 +300,7 @@ public:
     inline void glCompressedTextureImage3D(GLuint texture, GLenum target, GLenum bindingTarget, GLint level,
                                            GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth,
                                            GLint border, GLsizei imageSize, const GLvoid *bits,
-                                           const QOpenGLPixelTransferOptions * const options = 0)
+                                           const QOpenGLPixelTransferOptions * const options = nullptr)
     {
         if (options) {
             QOpenGLPixelTransferOptions oldOptions = savePixelUploadOptions();
diff --git a/src/gui/painting/qcosmeticstroker_p.h b/src/gui/painting/qcosmeticstroker_p.h
index 082ddee30f..8571b0476a 100644
--- a/src/gui/painting/qcosmeticstroker_p.h
+++ b/src/gui/painting/qcosmeticstroker_p.h
@@ -98,8 +98,8 @@ public:
         : state(s),
           deviceRect(dr_unclipped),
           clip(dr),
-          pattern(0),
-          reversePattern(0),
+          pattern(nullptr),
+          reversePattern(nullptr),
           patternSize(0),
           patternLength(0),
           patternOffset(0),
diff --git a/src/gui/painting/qdatabuffer_p.h b/src/gui/painting/qdatabuffer_p.h
index 28d5f6d6c5..181d19da0b 100644
--- a/src/gui/painting/qdatabuffer_p.h
+++ b/src/gui/painting/qdatabuffer_p.h
@@ -69,7 +69,7 @@ public:
             buffer = (Type*) malloc(capacity * sizeof(Type));
             Q_CHECK_PTR(buffer);
         } else {
-            buffer = 0;
+            buffer = nullptr;
         }
         siz = 0;
     }
@@ -128,7 +128,7 @@ public:
             Q_CHECK_PTR(buffer);
         } else {
             free(buffer);
-            buffer = 0;
+            buffer = nullptr;
         }
     }
 
diff --git a/src/gui/painting/qdrawhelper_p.h b/src/gui/painting/qdrawhelper_p.h
index 37108949d6..1e99a34842 100644
--- a/src/gui/painting/qdrawhelper_p.h
+++ b/src/gui/painting/qdrawhelper_p.h
@@ -328,7 +328,7 @@ struct QTextureData
 
 struct QSpanData
 {
-    QSpanData() : tempImage(0) {}
+    QSpanData() : tempImage(nullptr) {}
     ~QSpanData() { delete tempImage; }
 
     QRasterBuffer *rasterBuffer;
diff --git a/src/gui/painting/qoutlinemapper_p.h b/src/gui/painting/qoutlinemapper_p.h
index 71999fbdee..04a68797c2 100644
--- a/src/gui/painting/qoutlinemapper_p.h
+++ b/src/gui/painting/qoutlinemapper_p.h
@@ -180,13 +180,13 @@ public:
     QT_FT_Outline *outline() {
         if (m_valid)
             return &m_outline;
-        return 0;
+        return nullptr;
     }
 
     QT_FT_Outline *convertPath(const QPainterPath &path);
     QT_FT_Outline *convertPath(const QVectorPath &path);
 
-    inline QPainterPath::ElementType *elementTypes() const { return m_element_types.size() == 0 ? 0 : m_element_types.data(); }
+    inline QPainterPath::ElementType *elementTypes() const { return m_element_types.size() == 0 ? nullptr : m_element_types.data(); }
 
 public:
     QDataBuffer<QPainterPath::ElementType> m_element_types;
diff --git a/src/gui/painting/qpaintengine_p.h b/src/gui/painting/qpaintengine_p.h
index 8ac3fcff5c..40b9474165 100644
--- a/src/gui/painting/qpaintengine_p.h
+++ b/src/gui/painting/qpaintengine_p.h
@@ -65,7 +65,7 @@ class Q_GUI_EXPORT QPaintEnginePrivate
 {
     Q_DECLARE_PUBLIC(QPaintEngine)
 public:
-    QPaintEnginePrivate() : pdev(0), q_ptr(0), currentClipDevice(0), hasSystemTransform(0),
+    QPaintEnginePrivate() : pdev(nullptr), q_ptr(nullptr), currentClipDevice(nullptr), hasSystemTransform(0),
                             hasSystemViewport(0) {}
     virtual ~QPaintEnginePrivate();
 
@@ -138,8 +138,8 @@ public:
 
     static QPaintEnginePrivate *get(QPaintEngine *paintEngine) { return paintEngine->d_func(); }
 
-    virtual QPaintEngine *aggregateEngine() { return 0; }
-    virtual Qt::HANDLE nativeHandle() { return 0; }
+    virtual QPaintEngine *aggregateEngine() { return nullptr; }
+    virtual Qt::HANDLE nativeHandle() { return nullptr; }
 };
 
 QT_END_NAMESPACE
diff --git a/src/gui/painting/qpaintengine_raster_p.h b/src/gui/painting/qpaintengine_raster_p.h
index c3734f1c62..500e0fae54 100644
--- a/src/gui/painting/qpaintengine_raster_p.h
+++ b/src/gui/painting/qpaintengine_raster_p.h
@@ -426,7 +426,7 @@ inline void QClipData::appendSpans(const QSpan *s, int num)
 class QRasterBuffer
 {
 public:
-    QRasterBuffer() : m_width(0), m_height(0), m_buffer(0) { init(); }
+    QRasterBuffer() : m_width(0), m_height(0), m_buffer(nullptr) { init(); }
 
     ~QRasterBuffer();
 
diff --git a/src/gui/painting/qpainter_p.h b/src/gui/painting/qpainter_p.h
index 9857a59070..bd2bc4c9b3 100644
--- a/src/gui/painting/qpainter_p.h
+++ b/src/gui/painting/qpainter_p.h
@@ -193,9 +193,9 @@ class QPainterPrivate
     Q_DECLARE_PUBLIC(QPainter)
 public:
     QPainterPrivate(QPainter *painter)
-    : q_ptr(painter), d_ptrs(0), state(0), dummyState(0), txinv(0), inDestructor(false), d_ptrs_size(0),
-        refcount(1), device(0), original_device(0), helper_device(0), engine(0), emulationEngine(0),
-        extended(0)
+    : q_ptr(painter), d_ptrs(nullptr), state(nullptr), dummyState(nullptr), txinv(0), inDestructor(false), d_ptrs_size(0),
+        refcount(1), device(nullptr), original_device(nullptr), helper_device(nullptr), engine(nullptr), emulationEngine(nullptr),
+        extended(nullptr)
     {
     }
 
diff --git a/src/gui/painting/qpainterpath_p.h b/src/gui/painting/qpainterpath_p.h
index a36c8005bc..98056483bc 100644
--- a/src/gui/painting/qpainterpath_p.h
+++ b/src/gui/painting/qpainterpath_p.h
@@ -168,7 +168,7 @@ public:
         fillRule(Qt::OddEvenFill),
         dirtyBounds(false),
         dirtyControlBounds(false),
-        pathConverter(0)
+        pathConverter(nullptr)
     {
         require_moveTo = false;
         convex = false;
@@ -181,7 +181,7 @@ public:
         dirtyBounds(other.dirtyBounds),
         dirtyControlBounds(other.dirtyControlBounds),
         convex(other.convex),
-        pathConverter(0)
+        pathConverter(nullptr)
     {
         require_moveTo = false;
         elements = other.elements;
diff --git a/src/gui/painting/qpathclipper_p.h b/src/gui/painting/qpathclipper_p.h
index c25a479807..9444a87b71 100644
--- a/src/gui/painting/qpathclipper_p.h
+++ b/src/gui/painting/qpathclipper_p.h
@@ -82,7 +82,7 @@ public:
     bool intersect();
     bool contains();
 
-    static bool pathToRect(const QPainterPath &path, QRectF *rect = 0);
+    static bool pathToRect(const QPainterPath &path, QRectF *rect = nullptr);
     static QPainterPath intersect(const QPainterPath &path, const QRectF &rect);
 
 private:
@@ -394,7 +394,7 @@ inline const QPathSegments::Intersection *QPathSegments::intersectionAt(int inde
 {
     const int intersection = m_segments.at(index).intersection;
     if (intersection < 0)
-        return 0;
+        return nullptr;
     else
         return &m_intersections.at(intersection);
 }
@@ -428,12 +428,12 @@ inline int QWingedEdge::edgeCount() const
 
 inline QPathEdge *QWingedEdge::edge(int edge)
 {
-    return edge < 0 ? 0 : &m_edges.at(edge);
+    return edge < 0 ? nullptr : &m_edges.at(edge);
 }
 
 inline const QPathEdge *QWingedEdge::edge(int edge) const
 {
-    return edge < 0 ? 0 : &m_edges.at(edge);
+    return edge < 0 ? nullptr : &m_edges.at(edge);
 }
 
 inline int QWingedEdge::vertexCount() const
@@ -449,12 +449,12 @@ inline int QWingedEdge::addVertex(const QPointF &p)
 
 inline QPathVertex *QWingedEdge::vertex(int vertex)
 {
-    return vertex < 0 ? 0 : &m_vertices.at(vertex);
+    return vertex < 0 ? nullptr : &m_vertices.at(vertex);
 }
 
 inline const QPathVertex *QWingedEdge::vertex(int vertex) const
 {
-    return vertex < 0 ? 0 : &m_vertices.at(vertex);
+    return vertex < 0 ? nullptr : &m_vertices.at(vertex);
 }
 
 inline QPathEdge::Traversal QWingedEdge::flip(QPathEdge::Traversal traversal)
diff --git a/src/gui/painting/qplatformbackingstore.h b/src/gui/painting/qplatformbackingstore.h
index de5ba964dc..414d2bf0de 100644
--- a/src/gui/painting/qplatformbackingstore.h
+++ b/src/gui/painting/qplatformbackingstore.h
@@ -85,7 +85,7 @@ public:
     };
     Q_DECLARE_FLAGS(Flags, Flag)
 
-    explicit QPlatformTextureList(QObject *parent = 0);
+    explicit QPlatformTextureList(QObject *parent = nullptr);
     ~QPlatformTextureList();
 
     int count() const;
@@ -99,7 +99,7 @@ public:
     bool isLocked() const;
 
     void appendTexture(void *source, GLuint textureId, const QRect &geometry,
-                       const QRect &clipRect = QRect(), Flags flags = 0);
+                       const QRect &clipRect = QRect(), Flags flags = nullptr);
     void clear();
 
  Q_SIGNALS:
diff --git a/src/gui/painting/qrbtree_p.h b/src/gui/painting/qrbtree_p.h
index d3ee23a91c..42e88889a1 100644
--- a/src/gui/painting/qrbtree_p.h
+++ b/src/gui/painting/qrbtree_p.h
@@ -60,7 +60,7 @@ struct QRBTree
 {
     struct Node
     {
-        inline Node() : parent(0), left(0), right(0), red(true) { }
+        inline Node() : parent(nullptr), left(nullptr), right(nullptr), red(true) { }
         inline ~Node() {if (left) delete left; if (right) delete right;}
         T data;
         Node *parent;
@@ -69,7 +69,7 @@ struct QRBTree
         bool red;
     };
 
-    inline QRBTree() : root(0), freeList(0) { }
+    inline QRBTree() : root(nullptr), freeList(nullptr) { }
     inline ~QRBTree();
 
     inline void clear();
@@ -120,7 +120,7 @@ inline QRBTree<T>::~QRBTree()
     while (freeList) {
         // Avoid recursively calling the destructor, as this list may become large.
         Node *next = freeList->right;
-        freeList->right = 0;
+        freeList->right = nullptr;
         delete freeList;
         freeList = next;
     }
@@ -131,7 +131,7 @@ inline void QRBTree<T>::clear()
 {
     if (root)
         delete root;
-    root = 0;
+    root = nullptr;
 }
 
 template <class T>
@@ -359,7 +359,7 @@ void QRBTree<T>::detach(Node *node) // call this before removing a node.
     ref = child;
     if (child)
         child->parent = node->parent;
-    node->left = node->right = node->parent = 0;
+    node->left = node->right = node->parent = nullptr;
 }
 
 // 'node' must be black. rebalance will reduce the depth of black nodes by one in the sibling tree.
@@ -513,7 +513,7 @@ inline void QRBTree<T>::deleteNode(Node *&node)
     detach(node);
     node->right = freeList;
     freeList = node;
-    node = 0;
+    node = nullptr;
 }
 
 template <class T>
@@ -522,7 +522,7 @@ inline typename QRBTree<T>::Node *QRBTree<T>::newNode()
     if (freeList) {
         Node *node = freeList;
         freeList = freeList->right;
-        node->parent = node->left = node->right = 0;
+        node->parent = node->left = node->right = nullptr;
         node->red = true;
         return node;
     }
diff --git a/src/gui/painting/qtextureglyphcache_p.h b/src/gui/painting/qtextureglyphcache_p.h
index 3da28872b1..1e83ab46d1 100644
--- a/src/gui/painting/qtextureglyphcache_p.h
+++ b/src/gui/painting/qtextureglyphcache_p.h
@@ -75,7 +75,7 @@ class Q_GUI_EXPORT QTextureGlyphCache : public QFontEngineGlyphCache
 {
 public:
     QTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix)
-        : QFontEngineGlyphCache(format, matrix), m_current_fontengine(0),
+        : QFontEngineGlyphCache(format, matrix), m_current_fontengine(nullptr),
                                                m_w(0), m_h(0), m_cx(0), m_cy(0), m_currentRowHeight(0)
         { }
 
diff --git a/src/gui/painting/qvectorpath_p.h b/src/gui/painting/qvectorpath_p.h
index 1b649a5d2a..df5772d4cc 100644
--- a/src/gui/painting/qvectorpath_p.h
+++ b/src/gui/painting/qvectorpath_p.h
@@ -106,7 +106,7 @@ public:
     // ### Falcon: introduca a struct XY for points so lars is not so confused...
     QVectorPath(const qreal *points,
                 int count,
-                const QPainterPath::ElementType *elements = 0,
+                const QPainterPath::ElementType *elements = nullptr,
                 uint hints = ArbitraryShapeHint)
         : m_elements(elements),
           m_points(points),
@@ -128,12 +128,12 @@ public:
     inline bool hasExplicitOpen() const { return m_hints & ExplicitOpen; }
     inline bool hasWindingFill() const { return m_hints & WindingFill; }
 
-    inline void makeCacheable() const { m_hints |= ShouldUseCacheHint; m_cache = 0; }
+    inline void makeCacheable() const { m_hints |= ShouldUseCacheHint; m_cache = nullptr; }
     inline uint hints() const { return m_hints; }
 
     inline const QPainterPath::ElementType *elements() const { return m_elements; }
     inline const qreal *points() const { return m_points; }
-    inline bool isEmpty() const { return m_points == 0; }
+    inline bool isEmpty() const { return m_points == nullptr; }
 
     inline int elementCount() const { return m_count; }
     inline const QPainterPath convertToPainterPath() const;
@@ -165,7 +165,7 @@ public:
                 return e;
             e = e->next;
         }
-        return 0;
+        return nullptr;
     }
 
     template <typename T> static inline bool isRect(const T *pts, int elementCount) {
diff --git a/src/gui/text/qabstracttextdocumentlayout_p.h b/src/gui/text/qabstracttextdocumentlayout_p.h
index 191c463dc6..d631ce3197 100644
--- a/src/gui/text/qabstracttextdocumentlayout_p.h
+++ b/src/gui/text/qabstracttextdocumentlayout_p.h
@@ -59,7 +59,7 @@ QT_BEGIN_NAMESPACE
 
 struct QTextObjectHandler
 {
-    QTextObjectHandler() : iface(0) {}
+    QTextObjectHandler() : iface(nullptr) {}
     QTextObjectInterface *iface;
     QPointer<QObject> component;
 };
@@ -71,12 +71,12 @@ public:
     Q_DECLARE_PUBLIC(QAbstractTextDocumentLayout)
 
     inline QAbstractTextDocumentLayoutPrivate()
-        : paintDevice(0) {}
+        : paintDevice(nullptr) {}
     ~QAbstractTextDocumentLayoutPrivate();
 
     inline void setDocument(QTextDocument *doc) {
         document = doc;
-        docPrivate = 0;
+        docPrivate = nullptr;
         if (doc)
             docPrivate = doc->docHandle();
     }
diff --git a/src/gui/text/qcssparser_p.h b/src/gui/text/qcssparser_p.h
index 860bbe382a..62578f75e5 100644
--- a/src/gui/text/qcssparser_p.h
+++ b/src/gui/text/qcssparser_p.h
@@ -467,8 +467,8 @@ struct Q_GUI_EXPORT Declaration
     Attachment attachmentValue() const;
     int  styleFeaturesValue() const;
 
-    bool intValue(int *i, const char *unit = 0) const;
-    bool realValue(qreal *r, const char *unit = 0) const;
+    bool intValue(int *i, const char *unit = nullptr) const;
+    bool realValue(qreal *r, const char *unit = nullptr) const;
 
     QSize sizeValue() const;
     QRect rectValue() const;
@@ -584,7 +584,7 @@ struct Q_GUI_EXPORT Selector
 {
     QVector<BasicSelector> basicSelectors;
     int specificity() const;
-    quint64 pseudoClass(quint64 *negated = 0) const;
+    quint64 pseudoClass(quint64 *negated = nullptr) const;
     QString pseudoElement() const;
 };
 QT_CSS_DECLARE_TYPEINFO(Selector, Q_MOVABLE_TYPE)
@@ -656,7 +656,7 @@ public:
     };
 
     QVector<StyleRule> styleRulesForNode(NodePtr node);
-    QVector<Declaration> declarationsForNode(NodePtr node, const char *extraPseudo = 0);
+    QVector<Declaration> declarationsForNode(NodePtr node, const char *extraPseudo = nullptr);
 
     virtual bool nodeNameEquals(NodePtr node, const QString& nodeName) const;
     virtual QString attribute(NodePtr node, const QString &name) const = 0;
@@ -744,7 +744,7 @@ QT_CSS_DECLARE_TYPEINFO(Symbol, Q_MOVABLE_TYPE)
 class Q_GUI_EXPORT Scanner
 {
 public:
-    static QString preprocess(const QString &input, bool *hasEscapeSequences = 0);
+    static QString preprocess(const QString &input, bool *hasEscapeSequences = nullptr);
     static void scan(const QString &preprocessedInput, QVector<Symbol> *symbols);
 };
 
@@ -845,7 +845,7 @@ struct Q_GUI_EXPORT ValueExtractor
     bool extractGeometry(int *w, int *h, int *minw, int *minh, int *maxw, int *maxh);
     bool extractPosition(int *l, int *t, int *r, int *b, QCss::Origin *, Qt::Alignment *,
                          QCss::PositionMode *, Qt::Alignment *);
-    bool extractBox(int *margins, int *paddings, int *spacing = 0);
+    bool extractBox(int *margins, int *paddings, int *spacing = nullptr);
     bool extractBorder(int *borders, QBrush *colors, BorderStyle *Styles, QSize *radii);
     bool extractOutline(int *borders, QBrush *colors, BorderStyle *Styles, QSize *radii, int *offsets);
     bool extractPalette(QBrush *fg, QBrush *sfg, QBrush *sbg, QBrush *abg);
diff --git a/src/gui/text/qdistancefield_p.h b/src/gui/text/qdistancefield_p.h
index 31cdf7edd2..1a1b6866a2 100644
--- a/src/gui/text/qdistancefield_p.h
+++ b/src/gui/text/qdistancefield_p.h
@@ -72,7 +72,7 @@ int Q_GUI_EXPORT QT_DISTANCEFIELD_HIGHGLYPHCOUNT();
 class Q_GUI_EXPORT QDistanceFieldData : public QSharedData
 {
 public:
-    QDistanceFieldData() : glyph(0), width(0), height(0), nbytes(0), data(0) {}
+    QDistanceFieldData() : glyph(0), width(0), height(0), nbytes(0), data(nullptr) {}
     QDistanceFieldData(const QDistanceFieldData &other);
     ~QDistanceFieldData();
 
diff --git a/src/gui/text/qfont_p.h b/src/gui/text/qfont_p.h
index e86ec31e47..6156faa788 100644
--- a/src/gui/text/qfont_p.h
+++ b/src/gui/text/qfont_p.h
@@ -266,7 +266,7 @@ public:
 
     // QFontEngine cache
     struct Engine {
-        Engine() : data(0), timestamp(0), hits(0) { }
+        Engine() : data(nullptr), timestamp(0), hits(0) { }
         Engine(QFontEngine *d) : data(d), timestamp(0), hits(0) { }
 
         QFontEngine *data;
diff --git a/src/gui/text/qfontengine_p.h b/src/gui/text/qfontengine_p.h
index 708c79c2ae..05c6746185 100644
--- a/src/gui/text/qfontengine_p.h
+++ b/src/gui/text/qfontengine_p.h
@@ -194,7 +194,7 @@ public:
     virtual QImage *lockedAlphaMapForGlyph(glyph_t glyph, QFixed subPixelPosition,
                                            GlyphFormat neededFormat,
                                            const QTransform &t = QTransform(),
-                                           QPoint *offset = 0);
+                                           QPoint *offset = nullptr);
     virtual void unlockAlphaMapForGlyph();
     virtual bool hasInternalCaching() const { return false; }
 
@@ -224,7 +224,7 @@ public:
     virtual qreal minLeftBearing() const;
     virtual qreal minRightBearing() const;
 
-    virtual void getGlyphBearings(glyph_t glyph, qreal *leftBearing = 0, qreal *rightBearing = 0);
+    virtual void getGlyphBearings(glyph_t glyph, qreal *leftBearing = nullptr, qreal *rightBearing = nullptr);
 
     inline bool canRender(uint ucs4) const { return glyphIndex(ucs4) != 0; }
     virtual bool canRender(const QChar *str, int len) const;
@@ -234,7 +234,7 @@ public:
     virtual int glyphCount() const;
     virtual int glyphMargin(GlyphFormat format) { return format == Format_A32 ? 2 : 0; }
 
-    virtual QFontEngine *cloneWithSize(qreal /*pixelSize*/) const { return 0; }
+    virtual QFontEngine *cloneWithSize(qreal /*pixelSize*/) const { return nullptr; }
 
     virtual Qt::HANDLE handle() const;
 
@@ -458,7 +458,7 @@ public:
     virtual void recalcAdvances(QGlyphLayout *, ShaperFlags) const override;
     virtual void doKerning(QGlyphLayout *, ShaperFlags) const override;
     virtual void addOutlineToPath(qreal, qreal, const QGlyphLayout &, QPainterPath *, QTextItem::RenderFlags flags) override;
-    virtual void getGlyphBearings(glyph_t glyph, qreal *leftBearing = 0, qreal *rightBearing = 0) override;
+    virtual void getGlyphBearings(glyph_t glyph, qreal *leftBearing = nullptr, qreal *rightBearing = nullptr) override;
 
     virtual QFixed ascent() const override;
     virtual QFixed capHeight() const override;
diff --git a/src/gui/text/qfragmentmap_p.h b/src/gui/text/qfragmentmap_p.h
index 35f60ac961..1d781352f8 100644
--- a/src/gui/text/qfragmentmap_p.h
+++ b/src/gui/text/qfragmentmap_p.h
@@ -216,7 +216,7 @@ private:
 
 template <class Fragment>
 QFragmentMapData<Fragment>::QFragmentMapData()
-    : fragments(0)
+    : fragments(nullptr)
 {
     init();
 }
diff --git a/src/gui/text/qglyphrun_p.h b/src/gui/text/qglyphrun_p.h
index 5b6bdad648..465c3c7000 100644
--- a/src/gui/text/qglyphrun_p.h
+++ b/src/gui/text/qglyphrun_p.h
@@ -65,7 +65,7 @@ class QGlyphRunPrivate: public QSharedData
 {
 public:
     QGlyphRunPrivate()
-        : flags(0)
+        : flags(nullptr)
         , glyphIndexData(glyphIndexes.constData())
         , glyphIndexDataSize(0)
         , glyphPositionData(glyphPositions.constData())
diff --git a/src/gui/text/qrawfont_p.h b/src/gui/text/qrawfont_p.h
index 0fc8739bfb..dced165475 100644
--- a/src/gui/text/qrawfont_p.h
+++ b/src/gui/text/qrawfont_p.h
@@ -67,9 +67,9 @@ class Q_GUI_EXPORT QRawFontPrivate
 {
 public:
     QRawFontPrivate()
-        : fontEngine(0)
+        : fontEngine(nullptr)
         , hintingPreference(QFont::PreferDefaultHinting)
-        , thread(0)
+        , thread(nullptr)
     {}
 
     QRawFontPrivate(const QRawFontPrivate &other)
@@ -78,9 +78,9 @@ public:
         , thread(other.thread)
     {
 #ifndef QT_NO_DEBUG
-        Q_ASSERT(fontEngine == 0 || thread == QThread::currentThread());
+        Q_ASSERT(fontEngine == nullptr || thread == QThread::currentThread());
 #endif
-        if (fontEngine != 0)
+        if (fontEngine != nullptr)
             fontEngine->ref.ref();
     }
 
@@ -94,37 +94,37 @@ public:
 
     inline void cleanUp()
     {
-        setFontEngine(0);
+        setFontEngine(nullptr);
         hintingPreference = QFont::PreferDefaultHinting;
     }
 
     inline bool isValid() const
     {
 #ifndef QT_NO_DEBUG
-        Q_ASSERT(fontEngine == 0 || thread == QThread::currentThread());
+        Q_ASSERT(fontEngine == nullptr || thread == QThread::currentThread());
 #endif
-        return fontEngine != 0;
+        return fontEngine != nullptr;
     }
 
     inline void setFontEngine(QFontEngine *engine)
     {
 #ifndef QT_NO_DEBUG
-        Q_ASSERT(fontEngine == 0 || thread == QThread::currentThread());
+        Q_ASSERT(fontEngine == nullptr || thread == QThread::currentThread());
 #endif
         if (fontEngine == engine)
             return;
 
-        if (fontEngine != 0) {
+        if (fontEngine != nullptr) {
             if (!fontEngine->ref.deref())
                 delete fontEngine;
 #ifndef QT_NO_DEBUG
-            thread = 0;
+            thread = nullptr;
 #endif
         }
 
         fontEngine = engine;
 
-        if (fontEngine != 0) {
+        if (fontEngine != nullptr) {
             fontEngine->ref.ref();
 #ifndef QT_NO_DEBUG
             thread = QThread::currentThread();
diff --git a/src/gui/text/qstatictext_p.h b/src/gui/text/qstatictext_p.h
index 4ec09297c5..8d6792216d 100644
--- a/src/gui/text/qstatictext_p.h
+++ b/src/gui/text/qstatictext_p.h
@@ -80,7 +80,7 @@ class Q_GUI_EXPORT QStaticTextItem
 public:
     QStaticTextItem() : useBackendOptimizations(false),
                         userDataNeedsUpdate(0), usesRawFont(0),
-                        m_fontEngine(0), m_userData(0) {}
+                        m_fontEngine(nullptr), m_userData(nullptr) {}
 
     void setUserData(QStaticTextUserData *newUserData)
     {
diff --git a/src/gui/text/qtextdocument_p.h b/src/gui/text/qtextdocument_p.h
index cad9131fbf..d95f5bef6a 100644
--- a/src/gui/text/qtextdocument_p.h
+++ b/src/gui/text/qtextdocument_p.h
@@ -101,10 +101,10 @@ class QTextBlockData : public QFragment<3>
 {
 public:
     inline void initialize()
-        { layout = 0; userData = 0; userState = -1; revision = 0; hidden = 0; }
+        { layout = nullptr; userData = nullptr; userState = -1; revision = 0; hidden = 0; }
     void invalidate() const;
     inline void free()
-    { delete layout; layout = 0; delete userData; userData = 0; }
+    { delete layout; layout = nullptr; delete userData; userData = nullptr; }
 
     mutable int format;
     // ##### probably store a QTextEngine * here!
diff --git a/src/gui/text/qtextdocumentfragment_p.h b/src/gui/text/qtextdocumentfragment_p.h
index de01a02fbb..67b0c2c600 100644
--- a/src/gui/text/qtextdocumentfragment_p.h
+++ b/src/gui/text/qtextdocumentfragment_p.h
@@ -125,7 +125,7 @@ public:
 
     QTextHtmlImporter(QTextDocument *_doc, const QString &html,
                       ImportMode mode,
-                      const QTextDocument *resourceProvider = 0);
+                      const QTextDocument *resourceProvider = nullptr);
 
     void import();
 
@@ -163,7 +163,7 @@ private:
 #endif
     struct TableCellIterator
     {
-        inline TableCellIterator(QTextTable *t = 0) : table(t), row(0), column(0) {}
+        inline TableCellIterator(QTextTable *t = nullptr) : table(t), row(0), column(0) {}
 
         inline TableCellIterator &operator++() {
             if (atEnd())
@@ -182,7 +182,7 @@ private:
             return *this;
         }
 
-        inline bool atEnd() const { return table == 0 || row >= table->rows(); }
+        inline bool atEnd() const { return table == nullptr || row >= table->rows(); }
 
         QTextTableCell cell() const { return table->cellAt(row, column); }
 
diff --git a/src/gui/text/qtextengine_p.h b/src/gui/text/qtextengine_p.h
index e9187ea605..fb2e812183 100644
--- a/src/gui/text/qtextengine_p.h
+++ b/src/gui/text/qtextengine_p.h
@@ -304,8 +304,8 @@ class QTextItemInt : public QTextItem
 {
 public:
     inline QTextItemInt()
-        : justified(false), underlineStyle(QTextCharFormat::NoUnderline), num_chars(0), chars(0),
-          logClusters(0), f(0), fontEngine(0)
+        : justified(false), underlineStyle(QTextCharFormat::NoUnderline), num_chars(0), chars(nullptr),
+          logClusters(nullptr), f(nullptr), fontEngine(nullptr)
     {}
     QTextItemInt(const QScriptItem &si, QFont *font, const QTextCharFormat &format = QTextCharFormat());
     QTextItemInt(const QGlyphLayout &g, QFont *font, const QChar *chars, int numChars, QFontEngine *fe,
@@ -484,7 +484,7 @@ public:
         return end - si->position;
     }
 
-    QFontEngine *fontEngine(const QScriptItem &si, QFixed *ascent = 0, QFixed *descent = 0, QFixed *leading = 0) const;
+    QFontEngine *fontEngine(const QScriptItem &si, QFixed *ascent = nullptr, QFixed *descent = nullptr, QFixed *leading = nullptr) const;
     QFont font(const QScriptItem &si) const;
     inline QFont font() const { return fnt; }
 
@@ -530,7 +530,7 @@ public:
     inline QTextFormatCollection *formatCollection() const {
         if (block.docHandle())
             return block.docHandle()->formatCollection();
-        return specialData ? specialData->formatCollection.data() : 0;
+        return specialData ? specialData->formatCollection.data() : nullptr;
     }
     QTextCharFormat format(const QScriptItem *si) const;
     inline QAbstractTextDocumentLayout *docLayout() const {
@@ -553,8 +553,8 @@ private:
         mutable int prevPosition;
         mutable int prevLength;
         inline void reset() {
-            prevFontEngine = 0;
-            prevScaledFontEngine = 0;
+            prevFontEngine = nullptr;
+            prevScaledFontEngine = nullptr;
             prevScript = -1;
             prevPosition = -1;
             prevLength = -1;
@@ -684,7 +684,7 @@ Q_DECLARE_TYPEINFO(QTextEngine::ItemDecoration, Q_MOVABLE_TYPE);
 struct QTextLineItemIterator
 {
     QTextLineItemIterator(QTextEngine *eng, int lineNum, const QPointF &pos = QPointF(),
-                          const QTextLayout::FormatRange *_selection = 0);
+                          const QTextLayout::FormatRange *_selection = nullptr);
 
     inline bool atEnd() const { return logicalItem >= nItems - 1; }
     inline bool atBeginning() const { return logicalItem <= 0; }
diff --git a/src/gui/text/qtextimagehandler_p.h b/src/gui/text/qtextimagehandler_p.h
index 339ef0af4f..fafd394ad3 100644
--- a/src/gui/text/qtextimagehandler_p.h
+++ b/src/gui/text/qtextimagehandler_p.h
@@ -65,7 +65,7 @@ class Q_GUI_EXPORT QTextImageHandler : public QObject,
     Q_OBJECT
     Q_INTERFACES(QTextObjectInterface)
 public:
-    explicit QTextImageHandler(QObject *parent = 0);
+    explicit QTextImageHandler(QObject *parent = nullptr);
 
     virtual QSizeF intrinsicSize(QTextDocument *doc, int posInDocument, const QTextFormat &format) override;
     virtual void drawObject(QPainter *p, const QRectF &rect, QTextDocument *doc, int posInDocument, const QTextFormat &format) override;
diff --git a/src/gui/text/qtextobject_p.h b/src/gui/text/qtextobject_p.h
index 81ab023cc3..87c83868da 100644
--- a/src/gui/text/qtextobject_p.h
+++ b/src/gui/text/qtextobject_p.h
@@ -93,7 +93,7 @@ class QTextFramePrivate : public QTextObjectPrivate
     Q_DECLARE_PUBLIC(QTextFrame)
 public:
     QTextFramePrivate(QTextDocument *doc)
-        : QTextObjectPrivate(doc), fragment_start(0), fragment_end(0), parentFrame(0), layoutData(0)
+        : QTextObjectPrivate(doc), fragment_start(0), fragment_end(0), parentFrame(nullptr), layoutData(nullptr)
     {
     }
     virtual void fragmentAdded(QChar type, uint fragment);
diff --git a/src/gui/text/qtexttable_p.h b/src/gui/text/qtexttable_p.h
index c969e1d5bc..5c05611009 100644
--- a/src/gui/text/qtexttable_p.h
+++ b/src/gui/text/qtexttable_p.h
@@ -61,7 +61,7 @@ class QTextTablePrivate : public QTextFramePrivate
 {
     Q_DECLARE_PUBLIC(QTextTable)
 public:
-    QTextTablePrivate(QTextDocument *document) : QTextFramePrivate(document), grid(0), nRows(0), nCols(0), dirty(true), blockFragmentUpdates(false) {}
+    QTextTablePrivate(QTextDocument *document) : QTextFramePrivate(document), grid(nullptr), nRows(0), nCols(0), dirty(true), blockFragmentUpdates(false) {}
     ~QTextTablePrivate();
 
     static QTextTable *createTable(QTextDocumentPrivate *, int pos, int rows, int cols, const QTextTableFormat &tableFormat);
diff --git a/src/gui/util/qgridlayoutengine_p.h b/src/gui/util/qgridlayoutengine_p.h
index 5f0cc5da73..5f0e84edb1 100644
--- a/src/gui/util/qgridlayoutengine_p.h
+++ b/src/gui/util/qgridlayoutengine_p.h
@@ -180,7 +180,7 @@ public:
             t = &q_minimumAscent;
             break;
         default:
-            t = 0;
+            t = nullptr;
             break;
         }
         return *t;
@@ -205,7 +205,7 @@ public:
             t = &q_minimumAscent;
             break;
         default:
-            t = 0;
+            t = nullptr;
             break;
         }
         return *t;
@@ -276,7 +276,7 @@ class Q_GUI_EXPORT QGridLayoutItem
 {
 public:
     QGridLayoutItem(int row, int column, int rowSpan = 1, int columnSpan = 1,
-                    Qt::Alignment alignment = 0);
+                    Qt::Alignment alignment = nullptr);
     virtual ~QGridLayoutItem() {}
 
     inline int firstRow() const { return q_firstRows[Ver]; }
@@ -339,7 +339,7 @@ private:
 class Q_GUI_EXPORT QGridLayoutEngine
 {
 public:
-    QGridLayoutEngine(Qt::Alignment defaultAlignment = Qt::Alignment(0), bool snapToPixelGrid = false);
+    QGridLayoutEngine(Qt::Alignment defaultAlignment = Qt::Alignment(nullptr), bool snapToPixelGrid = false);
     inline ~QGridLayoutEngine() { qDeleteAll(q_items); }
 
     int rowCount(Qt::Orientation orientation) const;
diff --git a/src/gui/vulkan/qvulkanwindow_p.h b/src/gui/vulkan/qvulkanwindow_p.h
index c6a772bc31..fb374a5564 100644
--- a/src/gui/vulkan/qvulkanwindow_p.h
+++ b/src/gui/vulkan/qvulkanwindow_p.h
@@ -97,7 +97,7 @@ public:
     int physDevIndex = 0;
     QVector<VkPhysicalDevice> physDevs;
     QVector<VkPhysicalDeviceProperties> physDevProps;
-    QVulkanWindow::Flags flags = 0;
+    QVulkanWindow::Flags flags = nullptr;
     QByteArrayList requestedDevExtensions;
     QHash<VkPhysicalDevice, QVulkanInfoVector<QVulkanExtension> > supportedDevExtensions;
     QVector<VkFormat> requestedColorFormats;