Make public headers compile with -Wzero-as-null-pointer-constant

... or equivalent.

QtBase 5.6 headers already compile that way, so let the other
modules follow suit.

Change-Id: I0f056b1acb2b223ad224faea1747339247a8a3c4
Task-number: QTBUG-45291
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

26 files changed, 42 insertions, 43 deletions

diff --git a/src/assistant/help/qhelpcontentwidget.h b/src/assistant/help/qhelpcontentwidget.h
index 43cd9b37b..2af6c022a 100644
--- a/src/assistant/help/qhelpcontentwidget.h
+++ b/src/assistant/help/qhelpcontentwidget.h
@@ -65,7 +65,7 @@ public:
 
 private:
     QHelpContentItem(const QString &name, const QString &link,
-        QHelpDBReader *reader, QHelpContentItem *parent = 0);
+        QHelpDBReader *reader, QHelpContentItem *parent = Q_NULLPTR);
     void appendChild(QHelpContentItem *child);
 
     QHelpContentItemPrivate *d;
diff --git a/src/assistant/help/qhelpengine.h b/src/assistant/help/qhelpengine.h
index c1b29654c..70216cc81 100644
--- a/src/assistant/help/qhelpengine.h
+++ b/src/assistant/help/qhelpengine.h
@@ -51,7 +51,7 @@ class QHELP_EXPORT QHelpEngine : public QHelpEngineCore
     Q_OBJECT
 
 public:
-    explicit QHelpEngine(const QString &collectionFile, QObject *parent = 0);
+    explicit QHelpEngine(const QString &collectionFile, QObject *parent = Q_NULLPTR);
     ~QHelpEngine();
 
     QHelpContentModel *contentModel() const;
diff --git a/src/assistant/help/qhelpenginecore.h b/src/assistant/help/qhelpenginecore.h
index 9476ac273..8b7ee2cdb 100644
--- a/src/assistant/help/qhelpenginecore.h
+++ b/src/assistant/help/qhelpenginecore.h
@@ -54,7 +54,7 @@ class QHELP_EXPORT QHelpEngineCore : public QObject
     Q_PROPERTY(QString currentFilter READ currentFilter WRITE setCurrentFilter)
 
 public:
-    explicit QHelpEngineCore(const QString &collectionFile, QObject *parent = 0);
+    explicit QHelpEngineCore(const QString &collectionFile, QObject *parent = Q_NULLPTR);
     virtual ~QHelpEngineCore();
 
     bool setupData();
diff --git a/src/assistant/help/qhelpsearchengine.h b/src/assistant/help/qhelpsearchengine.h
index 5baee49d0..314e91320 100644
--- a/src/assistant/help/qhelpsearchengine.h
+++ b/src/assistant/help/qhelpsearchengine.h
@@ -69,8 +69,7 @@ class QHELP_EXPORT QHelpSearchEngine : public QObject
     Q_OBJECT
 
 public:
-    explicit QHelpSearchEngine(QHelpEngineCore *helpEngine,
-        QObject *parent = 0);
+    explicit QHelpSearchEngine(QHelpEngineCore *helpEngine, QObject *parent = Q_NULLPTR);
     ~QHelpSearchEngine();
 
     QHelpSearchQueryWidget* queryWidget();
diff --git a/src/assistant/help/qhelpsearchquerywidget.h b/src/assistant/help/qhelpsearchquerywidget.h
index 7e6b197c8..79a6b2f96 100644
--- a/src/assistant/help/qhelpsearchquerywidget.h
+++ b/src/assistant/help/qhelpsearchquerywidget.h
@@ -54,7 +54,7 @@ class QHELP_EXPORT QHelpSearchQueryWidget : public QWidget
     Q_OBJECT
 
 public:
-    QHelpSearchQueryWidget(QWidget *parent = 0);
+    QHelpSearchQueryWidget(QWidget *parent = Q_NULLPTR);
     ~QHelpSearchQueryWidget();
 
     void expandExtendedSearch();
diff --git a/src/designer/src/lib/extension/default_extensionfactory.h b/src/designer/src/lib/extension/default_extensionfactory.h
index e43e6b3a2..2eb5865a7 100644
--- a/src/designer/src/lib/extension/default_extensionfactory.h
+++ b/src/designer/src/lib/extension/default_extensionfactory.h
@@ -50,7 +50,7 @@ class QDESIGNER_EXTENSION_EXPORT QExtensionFactory : public QObject, public QAbs
     Q_OBJECT
     Q_INTERFACES(QAbstractExtensionFactory)
 public:
-    QExtensionFactory(QExtensionManager *parent = 0);
+    QExtensionFactory(QExtensionManager *parent = Q_NULLPTR);
 
     QObject *extension(QObject *object, const QString &iid) const Q_DECL_OVERRIDE;
     QExtensionManager *extensionManager() const;
diff --git a/src/designer/src/lib/extension/extension.h b/src/designer/src/lib/extension/extension.h
index f15b4415b..924bb9a1f 100644
--- a/src/designer/src/lib/extension/extension.h
+++ b/src/designer/src/lib/extension/extension.h
@@ -82,13 +82,13 @@ template <> inline IFace *qt_extension_helper<IFace *>(QAbstractExtensionManager
 
 template <class T>
 inline T qt_extension(QAbstractExtensionManager *, QObject *)
-{ return 0; }
+{ return Q_NULLPTR; }
 
 #define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \
 const char * const IFace##_iid = IId; \
 Q_DECLARE_INTERFACE(IFace, IId) \
 template <> inline IFace *qt_extension<IFace *>(QAbstractExtensionManager *manager, QObject *object) \
-{ QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return extension ? static_cast<IFace *>(extension->qt_metacast(IFace##_iid)) : static_cast<IFace *>(0); }
+{ QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return extension ? static_cast<IFace *>(extension->qt_metacast(IFace##_iid)) : static_cast<IFace *>(Q_NULLPTR); }
 
 #endif
 
diff --git a/src/designer/src/lib/extension/qextensionmanager.h b/src/designer/src/lib/extension/qextensionmanager.h
index e0926aa6a..4275bfbd5 100644
--- a/src/designer/src/lib/extension/qextensionmanager.h
+++ b/src/designer/src/lib/extension/qextensionmanager.h
@@ -47,7 +47,7 @@ class QDESIGNER_EXTENSION_EXPORT QExtensionManager: public QObject, public QAbst
     Q_OBJECT
     Q_INTERFACES(QAbstractExtensionManager)
 public:
-    QExtensionManager(QObject *parent = 0);
+    QExtensionManager(QObject *parent = Q_NULLPTR);
     ~QExtensionManager();
 
     void registerExtensions(QAbstractExtensionFactory *factory, const QString &iid = QString()) Q_DECL_OVERRIDE;
diff --git a/src/designer/src/lib/sdk/abstractactioneditor.h b/src/designer/src/lib/sdk/abstractactioneditor.h
index 24a749e76..85de1b108 100644
--- a/src/designer/src/lib/sdk/abstractactioneditor.h
+++ b/src/designer/src/lib/sdk/abstractactioneditor.h
@@ -47,7 +47,7 @@ class QDESIGNER_SDK_EXPORT QDesignerActionEditorInterface: public QWidget
 {
     Q_OBJECT
 public:
-    QDesignerActionEditorInterface(QWidget *parent, Qt::WindowFlags flags = 0);
+    QDesignerActionEditorInterface(QWidget *parent, Qt::WindowFlags flags = Qt::WindowFlags());
     virtual ~QDesignerActionEditorInterface();
 
     virtual QDesignerFormEditorInterface *core() const;
diff --git a/src/designer/src/lib/sdk/abstractformeditor.h b/src/designer/src/lib/sdk/abstractformeditor.h
index 35b222361..a2b674694 100644
--- a/src/designer/src/lib/sdk/abstractformeditor.h
+++ b/src/designer/src/lib/sdk/abstractformeditor.h
@@ -70,7 +70,7 @@ class QDESIGNER_SDK_EXPORT QDesignerFormEditorInterface : public QObject
 {
     Q_OBJECT
 public:
-    QDesignerFormEditorInterface(QObject *parent = 0);
+    QDesignerFormEditorInterface(QObject *parent = Q_NULLPTR);
     virtual ~QDesignerFormEditorInterface();
 
     QExtensionManager *extensionManager() const;
diff --git a/src/designer/src/lib/sdk/abstractformwindow.h b/src/designer/src/lib/sdk/abstractformwindow.h
index d16173ddc..35cadf534 100644
--- a/src/designer/src/lib/sdk/abstractformwindow.h
+++ b/src/designer/src/lib/sdk/abstractformwindow.h
@@ -68,7 +68,7 @@ public:
     };
 
 public:
-    QDesignerFormWindowInterface(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    QDesignerFormWindowInterface(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     virtual ~QDesignerFormWindowInterface();
 
     virtual QString fileName() const = 0;
@@ -76,7 +76,7 @@ public:
 
     virtual QString contents() const = 0;
     virtual QStringList checkContents() const = 0;
-    virtual bool setContents(QIODevice *dev, QString *errorMessage = 0) = 0;
+    virtual bool setContents(QIODevice *dev, QString *errorMessage = Q_NULLPTR) = 0;
 
     virtual Feature features() const = 0;
     virtual bool hasFeature(Feature f) const = 0;
@@ -162,7 +162,7 @@ public Q_SLOTS:
     virtual bool setContents(const QString &contents) = 0;
 
     virtual void editWidgets() = 0;
-    void activateResourceFilePaths(const QStringList &paths, int *errorCount = 0, QString *errorMessages = 0);
+    void activateResourceFilePaths(const QStringList &paths, int *errorCount = Q_NULLPTR, QString *errorMessages = Q_NULLPTR);
 
 Q_SIGNALS:
     void mainContainerChanged(QWidget *mainContainer);
diff --git a/src/designer/src/lib/sdk/abstractformwindowmanager.h b/src/designer/src/lib/sdk/abstractformwindowmanager.h
index 7f7c5619c..cdcb1a88c 100644
--- a/src/designer/src/lib/sdk/abstractformwindowmanager.h
+++ b/src/designer/src/lib/sdk/abstractformwindowmanager.h
@@ -54,7 +54,7 @@ class QDESIGNER_SDK_EXPORT QDesignerFormWindowManagerInterface: public QObject
 {
     Q_OBJECT
 public:
-    explicit QDesignerFormWindowManagerInterface(QObject *parent = 0);
+    explicit QDesignerFormWindowManagerInterface(QObject *parent = Q_NULLPTR);
     virtual ~QDesignerFormWindowManagerInterface();
 
     enum Action
@@ -119,7 +119,7 @@ public:
     virtual int formWindowCount() const = 0;
     virtual QDesignerFormWindowInterface *formWindow(int index) const = 0;
 
-    virtual QDesignerFormWindowInterface *createFormWindow(QWidget *parentWidget = 0, Qt::WindowFlags flags = 0) = 0;
+    virtual QDesignerFormWindowInterface *createFormWindow(QWidget *parentWidget = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags()) = 0;
 
     virtual QDesignerFormEditorInterface *core() const = 0;
 
diff --git a/src/designer/src/lib/sdk/abstractformwindowtool.h b/src/designer/src/lib/sdk/abstractformwindowtool.h
index b596df32a..298d1db3f 100644
--- a/src/designer/src/lib/sdk/abstractformwindowtool.h
+++ b/src/designer/src/lib/sdk/abstractformwindowtool.h
@@ -50,7 +50,7 @@ class QDESIGNER_SDK_EXPORT QDesignerFormWindowToolInterface: public QObject
 {
     Q_OBJECT
 public:
-    QDesignerFormWindowToolInterface(QObject *parent = 0);
+    QDesignerFormWindowToolInterface(QObject *parent = Q_NULLPTR);
     virtual ~QDesignerFormWindowToolInterface();
 
     virtual QDesignerFormEditorInterface *core() const = 0;
diff --git a/src/designer/src/lib/sdk/abstractintegration.h b/src/designer/src/lib/sdk/abstractintegration.h
index 0aef90db5..5e544f929 100644
--- a/src/designer/src/lib/sdk/abstractintegration.h
+++ b/src/designer/src/lib/sdk/abstractintegration.h
@@ -77,7 +77,7 @@ public:
     };
     Q_DECLARE_FLAGS(Feature, FeatureFlag)
 
-    QDesignerIntegrationInterface(QDesignerFormEditorInterface *core, QObject *parent = 0);
+    QDesignerIntegrationInterface(QDesignerFormEditorInterface *core, QObject *parent = Q_NULLPTR);
     virtual ~QDesignerIntegrationInterface();
 
     QDesignerFormEditorInterface *core() const;
@@ -85,7 +85,7 @@ public:
     virtual QWidget *containerWindow(QWidget *widget) const = 0;
 
     // Create a resource browser specific to integration. Language integration takes precedence
-    virtual QDesignerResourceBrowserInterface *createResourceBrowser(QWidget *parent = 0) = 0;
+    virtual QDesignerResourceBrowserInterface *createResourceBrowser(QWidget *parent = Q_NULLPTR) = 0;
     virtual QString headerSuffix() const = 0;
     virtual void setHeaderSuffix(const QString &headerSuffix) = 0;
 
@@ -136,7 +136,7 @@ class QDESIGNER_SDK_EXPORT QDesignerIntegration: public QDesignerIntegrationInte
 {
     Q_OBJECT
 public:
-    explicit QDesignerIntegration(QDesignerFormEditorInterface *core, QObject *parent = 0);
+    explicit QDesignerIntegration(QDesignerFormEditorInterface *core, QObject *parent = Q_NULLPTR);
     virtual ~QDesignerIntegration();
 
     QString headerSuffix() const;
@@ -157,7 +157,7 @@ public:
     static void initializePlugins(QDesignerFormEditorInterface *formEditor);
 
     // Create a resource browser specific to integration. Language integration takes precedence
-    virtual QDesignerResourceBrowserInterface *createResourceBrowser(QWidget *parent = 0);
+    virtual QDesignerResourceBrowserInterface *createResourceBrowser(QWidget *parent = Q_NULLPTR);
 
     virtual QString contextHelpId() const;
 
diff --git a/src/designer/src/lib/sdk/abstractlanguage.h b/src/designer/src/lib/sdk/abstractlanguage.h
index b6a0b36de..66bbcce30 100644
--- a/src/designer/src/lib/sdk/abstractlanguage.h
+++ b/src/designer/src/lib/sdk/abstractlanguage.h
@@ -71,12 +71,12 @@ public:
     virtual QDialog *createFormWindowSettingsDialog(QDesignerFormWindowInterface *formWindow, QWidget *parentWidget) = 0;
     virtual QDesignerResourceBrowserInterface *createResourceBrowser(QWidget *parentWidget) = 0;
 
-    virtual QDialog *createPromotionDialog(QDesignerFormEditorInterface *formEditor, QWidget *parentWidget = 0) = 0;
+    virtual QDialog *createPromotionDialog(QDesignerFormEditorInterface *formEditor, QWidget *parentWidget = Q_NULLPTR) = 0;
 
     virtual QDialog *createPromotionDialog(QDesignerFormEditorInterface *formEditor,
                                            const QString &promotableWidgetClassName,
                                            QString *promoteToClassName,
-                                           QWidget *parentWidget = 0) = 0;
+                                           QWidget *parentWidget = Q_NULLPTR) = 0;
 
     virtual bool isLanguageResource(const QString &path) const = 0;
 
diff --git a/src/designer/src/lib/sdk/abstractmetadatabase.h b/src/designer/src/lib/sdk/abstractmetadatabase.h
index 08db94177..bc9b7882f 100644
--- a/src/designer/src/lib/sdk/abstractmetadatabase.h
+++ b/src/designer/src/lib/sdk/abstractmetadatabase.h
@@ -67,7 +67,7 @@ class QDESIGNER_SDK_EXPORT QDesignerMetaDataBaseInterface: public QObject
 {
     Q_OBJECT
 public:
-    QDesignerMetaDataBaseInterface(QObject *parent = 0);
+    QDesignerMetaDataBaseInterface(QObject *parent = Q_NULLPTR);
     virtual ~QDesignerMetaDataBaseInterface();
 
     virtual QDesignerMetaDataBaseItemInterface *item(QObject *object) const = 0;
diff --git a/src/designer/src/lib/sdk/abstractnewformwidget.h b/src/designer/src/lib/sdk/abstractnewformwidget.h
index 6db8d5120..65851a245 100644
--- a/src/designer/src/lib/sdk/abstractnewformwidget.h
+++ b/src/designer/src/lib/sdk/abstractnewformwidget.h
@@ -47,13 +47,13 @@ class QDESIGNER_SDK_EXPORT QDesignerNewFormWidgetInterface : public QWidget
     Q_DISABLE_COPY(QDesignerNewFormWidgetInterface)
     Q_OBJECT
 public:
-    explicit QDesignerNewFormWidgetInterface(QWidget *parent = 0);
+    explicit QDesignerNewFormWidgetInterface(QWidget *parent = Q_NULLPTR);
     virtual ~QDesignerNewFormWidgetInterface();
 
     virtual bool hasCurrentTemplate() const = 0;
-    virtual QString currentTemplate(QString *errorMessage = 0) = 0;
+    virtual QString currentTemplate(QString *errorMessage = Q_NULLPTR) = 0;
 
-    static QDesignerNewFormWidgetInterface *createNewFormWidget(QDesignerFormEditorInterface *core, QWidget *parent = 0);
+    static QDesignerNewFormWidgetInterface *createNewFormWidget(QDesignerFormEditorInterface *core, QWidget *parent = Q_NULLPTR);
 
 Q_SIGNALS:
     void templateActivated();
diff --git a/src/designer/src/lib/sdk/abstractobjectinspector.h b/src/designer/src/lib/sdk/abstractobjectinspector.h
index dcad701d6..b67e69c21 100644
--- a/src/designer/src/lib/sdk/abstractobjectinspector.h
+++ b/src/designer/src/lib/sdk/abstractobjectinspector.h
@@ -47,7 +47,7 @@ class QDESIGNER_SDK_EXPORT QDesignerObjectInspectorInterface: public QWidget
 {
     Q_OBJECT
 public:
-    QDesignerObjectInspectorInterface(QWidget *parent, Qt::WindowFlags flags = 0);
+    QDesignerObjectInspectorInterface(QWidget *parent, Qt::WindowFlags flags = Qt::WindowFlags());
     virtual ~QDesignerObjectInspectorInterface();
 
     virtual QDesignerFormEditorInterface *core() const;
diff --git a/src/designer/src/lib/sdk/abstractpropertyeditor.h b/src/designer/src/lib/sdk/abstractpropertyeditor.h
index e01d2e7ad..f54919ef0 100644
--- a/src/designer/src/lib/sdk/abstractpropertyeditor.h
+++ b/src/designer/src/lib/sdk/abstractpropertyeditor.h
@@ -48,7 +48,7 @@ class QDESIGNER_SDK_EXPORT QDesignerPropertyEditorInterface: public QWidget
 {
     Q_OBJECT
 public:
-    QDesignerPropertyEditorInterface(QWidget *parent, Qt::WindowFlags flags = 0);
+    QDesignerPropertyEditorInterface(QWidget *parent, Qt::WindowFlags flags = Qt::WindowFlags());
     virtual ~QDesignerPropertyEditorInterface();
 
     virtual QDesignerFormEditorInterface *core() const;
diff --git a/src/designer/src/lib/sdk/abstractresourcebrowser.h b/src/designer/src/lib/sdk/abstractresourcebrowser.h
index 12515d384..b0f71ebd8 100644
--- a/src/designer/src/lib/sdk/abstractresourcebrowser.h
+++ b/src/designer/src/lib/sdk/abstractresourcebrowser.h
@@ -46,7 +46,7 @@ class QDESIGNER_SDK_EXPORT QDesignerResourceBrowserInterface: public QWidget
 {
     Q_OBJECT
 public:
-    QDesignerResourceBrowserInterface(QWidget *parent = 0);
+    QDesignerResourceBrowserInterface(QWidget *parent = Q_NULLPTR);
     virtual ~QDesignerResourceBrowserInterface();
 
     virtual void setCurrentPath(const QString &filePath) = 0;
diff --git a/src/designer/src/lib/sdk/abstractwidgetbox.h b/src/designer/src/lib/sdk/abstractwidgetbox.h
index 2ac4c6d91..e6ccc1568 100644
--- a/src/designer/src/lib/sdk/abstractwidgetbox.h
+++ b/src/designer/src/lib/sdk/abstractwidgetbox.h
@@ -103,7 +103,7 @@ public:
     };
     typedef QList<Category> CategoryList;
 
-    QDesignerWidgetBoxInterface(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    QDesignerWidgetBoxInterface(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     virtual ~QDesignerWidgetBoxInterface();
 
     virtual int categoryCount() const = 0;
diff --git a/src/designer/src/lib/sdk/abstractwidgetdatabase.h b/src/designer/src/lib/sdk/abstractwidgetdatabase.h
index 0a0ebaa12..d8fd3ab8b 100644
--- a/src/designer/src/lib/sdk/abstractwidgetdatabase.h
+++ b/src/designer/src/lib/sdk/abstractwidgetdatabase.h
@@ -95,7 +95,7 @@ class QDESIGNER_SDK_EXPORT QDesignerWidgetDataBaseInterface: public QObject
 {
     Q_OBJECT
 public:
-    QDesignerWidgetDataBaseInterface(QObject *parent = 0);
+    QDesignerWidgetDataBaseInterface(QObject *parent = Q_NULLPTR);
     virtual ~QDesignerWidgetDataBaseInterface();
 
     virtual int count() const;
diff --git a/src/designer/src/lib/sdk/abstractwidgetfactory.h b/src/designer/src/lib/sdk/abstractwidgetfactory.h
index f87858087..8019b2685 100644
--- a/src/designer/src/lib/sdk/abstractwidgetfactory.h
+++ b/src/designer/src/lib/sdk/abstractwidgetfactory.h
@@ -47,7 +47,7 @@ class QDESIGNER_SDK_EXPORT QDesignerWidgetFactoryInterface: public QObject
 {
     Q_OBJECT
 public:
-    QDesignerWidgetFactoryInterface(QObject *parent = 0);
+    QDesignerWidgetFactoryInterface(QObject *parent = Q_NULLPTR);
     virtual ~QDesignerWidgetFactoryInterface();
 
     virtual QDesignerFormEditorInterface *core() const = 0;
@@ -55,7 +55,7 @@ public:
     virtual QWidget* containerOfWidget(QWidget *w) const = 0;
     virtual QWidget* widgetOfContainer(QWidget *w) const = 0;
 
-    virtual QWidget *createWidget(const QString &name, QWidget *parentWidget = 0) const = 0;
+    virtual QWidget *createWidget(const QString &name, QWidget *parentWidget = Q_NULLPTR) const = 0;
     virtual QLayout *createLayout(QWidget *widget, QLayout *layout, int type) const = 0;
 
     virtual bool isPassiveInteractor(QWidget *widget) = 0;
diff --git a/src/designer/src/lib/sdk/taskmenu.h b/src/designer/src/lib/sdk/taskmenu.h
index 16e7add58..c6b602fc0 100644
--- a/src/designer/src/lib/sdk/taskmenu.h
+++ b/src/designer/src/lib/sdk/taskmenu.h
@@ -53,7 +53,7 @@ Q_DECLARE_EXTENSION_INTERFACE(QDesignerTaskMenuExtension, "org.qt-project.Qt.Des
 
 
 inline QAction *QDesignerTaskMenuExtension::preferredEditAction() const
-{ return 0; }
+{ return Q_NULLPTR; }
 
 QT_END_NAMESPACE
 
diff --git a/src/designer/src/lib/uilib/abstractformbuilder.h b/src/designer/src/lib/uilib/abstractformbuilder.h
index e5e69edd7..764e4db66 100644
--- a/src/designer/src/lib/uilib/abstractformbuilder.h
+++ b/src/designer/src/lib/uilib/abstractformbuilder.h
@@ -107,7 +107,7 @@ public:
     QDir workingDirectory() const;
     void setWorkingDirectory(const QDir &directory);
 
-    virtual QWidget *load(QIODevice *dev, QWidget *parentWidget=0);
+    virtual QWidget *load(QIODevice *dev, QWidget *parentWidget = Q_NULLPTR);
     virtual void save(QIODevice *dev, QWidget *widget);
 
     QString errorString() const;
diff --git a/src/designer/src/uitools/quiloader.h b/src/designer/src/uitools/quiloader.h
index 7968e41d2..51a076545 100644
--- a/src/designer/src/uitools/quiloader.h
+++ b/src/designer/src/uitools/quiloader.h
@@ -52,21 +52,21 @@ class QUiLoader : public QObject
 {
     Q_OBJECT
 public:
-    QUiLoader(QObject *parent = 0);
+    QUiLoader(QObject *parent = Q_NULLPTR);
     virtual ~QUiLoader();
 
     QStringList pluginPaths() const;
     void clearPluginPaths();
     void addPluginPath(const QString &path);
 
-    QWidget *load(QIODevice *device, QWidget *parentWidget = 0);
+    QWidget *load(QIODevice *device, QWidget *parentWidget = Q_NULLPTR);
     QStringList availableWidgets() const;
     QStringList availableLayouts() const;
 
-    virtual QWidget *createWidget(const QString &className, QWidget *parent = 0, const QString &name = QString());
-    virtual QLayout *createLayout(const QString &className, QObject *parent = 0, const QString &name = QString());
-    virtual QActionGroup *createActionGroup(QObject *parent = 0, const QString &name = QString());
-    virtual QAction *createAction(QObject *parent = 0, const QString &name = QString());
+    virtual QWidget *createWidget(const QString &className, QWidget *parent = Q_NULLPTR, const QString &name = QString());
+    virtual QLayout *createLayout(const QString &className, QObject *parent = Q_NULLPTR, const QString &name = QString());
+    virtual QActionGroup *createActionGroup(QObject *parent = Q_NULLPTR, const QString &name = QString());
+    virtual QAction *createAction(QObject *parent = Q_NULLPTR, const QString &name = QString());
 
     void setWorkingDirectory(const QDir &dir);
     QDir workingDirectory() const;