Make QWidget *=0, Qt::WindowFlags f=0 functions use Q_NULLPTR

This is in preparation of adding -Wzero-as-null-pointer-constant (or similar)
to the headers check.

Task-number: QTBUG-45291
Change-Id: If9721e8b1ab3b4cd6e3e366362cae314f451bbed
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

8 files changed, 13 insertions, 12 deletions

diff --git a/src/widgets/widgets/qdockwidget.h b/src/widgets/widgets/qdockwidget.h
index af4a5521bf..25e4d4d0a4 100644
--- a/src/widgets/widgets/qdockwidget.h
+++ b/src/widgets/widgets/qdockwidget.h
@@ -58,8 +58,9 @@ class Q_WIDGETS_EXPORT QDockWidget : public QWidget
     Q_PROPERTY(QString windowTitle READ windowTitle WRITE setWindowTitle DESIGNABLE true)
 
 public:
-    explicit QDockWidget(const QString &title, QWidget *parent = 0, Qt::WindowFlags flags = 0);
-    explicit QDockWidget(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    explicit QDockWidget(const QString &title, QWidget *parent = Q_NULLPTR,
+                         Qt::WindowFlags flags = Qt::WindowFlags());
+    explicit QDockWidget(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     ~QDockWidget();
 
     QWidget *widget() const;
diff --git a/src/widgets/widgets/qframe.h b/src/widgets/widgets/qframe.h
index c32e38f311..eb4d74c72a 100644
--- a/src/widgets/widgets/qframe.h
+++ b/src/widgets/widgets/qframe.h
@@ -54,7 +54,7 @@ class Q_WIDGETS_EXPORT QFrame : public QWidget
     Q_PROPERTY(QRect frameRect READ frameRect WRITE setFrameRect DESIGNABLE false)
 
 public:
-    explicit QFrame(QWidget* parent = 0, Qt::WindowFlags f = 0);
+    explicit QFrame(QWidget* parent = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags());
     ~QFrame();
 
     int frameStyle() const;
@@ -108,7 +108,7 @@ protected:
 
 
 protected:
-    QFrame(QFramePrivate &dd, QWidget* parent = 0, Qt::WindowFlags f = 0);
+    QFrame(QFramePrivate &dd, QWidget* parent = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags());
     void initStyleOption(QStyleOptionFrame *option) const;
 
 private:
diff --git a/src/widgets/widgets/qlabel.h b/src/widgets/widgets/qlabel.h
index 330626a9c5..1a3a68db60 100644
--- a/src/widgets/widgets/qlabel.h
+++ b/src/widgets/widgets/qlabel.h
@@ -58,8 +58,8 @@ class Q_WIDGETS_EXPORT QLabel : public QFrame
     Q_PROPERTY(QString selectedText READ selectedText)
 
 public:
-    explicit QLabel(QWidget *parent=0, Qt::WindowFlags f=0);
-    explicit QLabel(const QString &text, QWidget *parent=0, Qt::WindowFlags f=0);
+    explicit QLabel(QWidget *parent=Q_NULLPTR, Qt::WindowFlags f=Qt::WindowFlags());
+    explicit QLabel(const QString &text, QWidget *parent=Q_NULLPTR, Qt::WindowFlags f=Qt::WindowFlags());
     ~QLabel();
 
     QString text() const;
diff --git a/src/widgets/widgets/qmainwindow.h b/src/widgets/widgets/qmainwindow.h
index 0bd70c87a6..ab6ee22748 100644
--- a/src/widgets/widgets/qmainwindow.h
+++ b/src/widgets/widgets/qmainwindow.h
@@ -83,7 +83,7 @@ public:
     Q_ENUM(DockOption)
     Q_DECLARE_FLAGS(DockOptions, DockOption)
 
-    explicit QMainWindow(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    explicit QMainWindow(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     ~QMainWindow();
 
     QSize iconSize() const;
diff --git a/src/widgets/widgets/qmdiarea.h b/src/widgets/widgets/qmdiarea.h
index 461282f8a8..f1361fffc6 100644
--- a/src/widgets/widgets/qmdiarea.h
+++ b/src/widgets/widgets/qmdiarea.h
@@ -89,7 +89,7 @@ public:
     QMdiSubWindow *activeSubWindow() const;
     QList<QMdiSubWindow *> subWindowList(WindowOrder order = CreationOrder) const;
 
-    QMdiSubWindow *addSubWindow(QWidget *widget, Qt::WindowFlags flags = 0);
+    QMdiSubWindow *addSubWindow(QWidget *widget, Qt::WindowFlags flags = Qt::WindowFlags());
     void removeSubWindow(QWidget *widget);
 
     QBrush background() const;
diff --git a/src/widgets/widgets/qmdisubwindow.h b/src/widgets/widgets/qmdisubwindow.h
index 693477c894..e7d0ca4e44 100644
--- a/src/widgets/widgets/qmdisubwindow.h
+++ b/src/widgets/widgets/qmdisubwindow.h
@@ -60,7 +60,7 @@ public:
     };
     Q_DECLARE_FLAGS(SubWindowOptions, SubWindowOption)
 
-    QMdiSubWindow(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    QMdiSubWindow(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     ~QMdiSubWindow();
 
     QSize sizeHint() const Q_DECL_OVERRIDE;
diff --git a/src/widgets/widgets/qsplashscreen.h b/src/widgets/widgets/qsplashscreen.h
index 58b8484f4c..dec24a5608 100644
--- a/src/widgets/widgets/qsplashscreen.h
+++ b/src/widgets/widgets/qsplashscreen.h
@@ -47,8 +47,8 @@ class Q_WIDGETS_EXPORT QSplashScreen : public QWidget
 {
     Q_OBJECT
 public:
-    explicit QSplashScreen(const QPixmap &pixmap = QPixmap(), Qt::WindowFlags f = 0);
-    QSplashScreen(QWidget *parent, const QPixmap &pixmap = QPixmap(), Qt::WindowFlags f = 0);
+    explicit QSplashScreen(const QPixmap &pixmap = QPixmap(), Qt::WindowFlags f = Qt::WindowFlags());
+    QSplashScreen(QWidget *parent, const QPixmap &pixmap = QPixmap(), Qt::WindowFlags f = Qt::WindowFlags());
     virtual ~QSplashScreen();
 
     void setPixmap(const QPixmap &pixmap);
diff --git a/src/widgets/widgets/qtoolbox.h b/src/widgets/widgets/qtoolbox.h
index cff5ae09ae..42b06e205c 100644
--- a/src/widgets/widgets/qtoolbox.h
+++ b/src/widgets/widgets/qtoolbox.h
@@ -51,7 +51,7 @@ class Q_WIDGETS_EXPORT QToolBox : public QFrame
     Q_PROPERTY(int count READ count)
 
 public:
-    explicit QToolBox(QWidget *parent = 0, Qt::WindowFlags f = 0);
+    explicit QToolBox(QWidget *parent = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags());
     ~QToolBox();
 
     int addItem(QWidget *widget, const QString &text);