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>

4 files changed, 16 insertions, 13 deletions

diff --git a/src/widgets/dialogs/qdialog.h b/src/widgets/dialogs/qdialog.h
index cd53378f9a..5ea5375387 100644
--- a/src/widgets/dialogs/qdialog.h
+++ b/src/widgets/dialogs/qdialog.h
@@ -51,7 +51,7 @@ class Q_WIDGETS_EXPORT QDialog : public QWidget
     Q_PROPERTY(bool modal READ isModal WRITE setModal)
 
 public:
-    explicit QDialog(QWidget *parent = 0, Qt::WindowFlags f = 0);
+    explicit QDialog(QWidget *parent = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags());
     ~QDialog();
 
     enum DialogCode { Rejected, Accepted };
@@ -90,7 +90,7 @@ public Q_SLOTS:
     void showExtension(bool);
 
 protected:
-    QDialog(QDialogPrivate &, QWidget *parent, Qt::WindowFlags f = 0);
+    QDialog(QDialogPrivate &, QWidget *parent, Qt::WindowFlags f = Qt::WindowFlags());
 
 #if defined(Q_OS_WINCE)
     bool event(QEvent *e);
diff --git a/src/widgets/dialogs/qinputdialog.h b/src/widgets/dialogs/qinputdialog.h
index 84130d5f90..600f6c9753 100644
--- a/src/widgets/dialogs/qinputdialog.h
+++ b/src/widgets/dialogs/qinputdialog.h
@@ -83,7 +83,7 @@ public:
         DoubleInput
     };
 
-    QInputDialog(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    QInputDialog(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     ~QInputDialog();
 
     void setInputMode(InputMode mode);
@@ -153,27 +153,29 @@ public:
 
     static QString getText(QWidget *parent, const QString &title, const QString &label,
                            QLineEdit::EchoMode echo = QLineEdit::Normal,
-                           const QString &text = QString(), bool *ok = 0, Qt::WindowFlags flags = 0,
+                           const QString &text = QString(), bool *ok = Q_NULLPTR,
+                           Qt::WindowFlags flags = Qt::WindowFlags(),
                            Qt::InputMethodHints inputMethodHints = Qt::ImhNone);
     static QString getMultiLineText(QWidget *parent, const QString &title, const QString &label,
-                           const QString &text = QString(), bool *ok = 0, Qt::WindowFlags flags = 0,
-                           Qt::InputMethodHints inputMethodHints = Qt::ImhNone);
+                                    const QString &text = QString(), bool *ok = Q_NULLPTR,
+                                    Qt::WindowFlags flags = Qt::WindowFlags(),
+                                    Qt::InputMethodHints inputMethodHints = Qt::ImhNone);
     static QString getItem(QWidget *parent, const QString &title, const QString &label,
                            const QStringList &items, int current = 0, bool editable = true,
-                           bool *ok = 0, Qt::WindowFlags flags = 0,
+                           bool *ok = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags(),
                            Qt::InputMethodHints inputMethodHints = Qt::ImhNone);
 
     static int getInt(QWidget *parent, const QString &title, const QString &label, int value = 0,
                       int minValue = -2147483647, int maxValue = 2147483647,
-                      int step = 1, bool *ok = 0, Qt::WindowFlags flags = 0);
+                      int step = 1, bool *ok = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     static double getDouble(QWidget *parent, const QString &title, const QString &label, double value = 0,
                             double minValue = -2147483647, double maxValue = 2147483647,
-                            int decimals = 1, bool *ok = 0, Qt::WindowFlags flags = 0);
+                            int decimals = 1, bool *ok = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
 
 #if QT_DEPRECATED_SINCE(5, 0)
     QT_DEPRECATED static inline int getInteger(QWidget *parent, const QString &title, const QString &label, int value = 0,
                           int minValue = -2147483647, int maxValue = 2147483647,
-                          int step = 1, bool *ok = 0, Qt::WindowFlags flags = 0)
+                          int step = 1, bool *ok = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags())
     {
         return getInt(parent, title, label, value, minValue, maxValue, step, ok, flags);
     }
diff --git a/src/widgets/dialogs/qprogressdialog.h b/src/widgets/dialogs/qprogressdialog.h
index 51c45f5d30..28de623385 100644
--- a/src/widgets/dialogs/qprogressdialog.h
+++ b/src/widgets/dialogs/qprogressdialog.h
@@ -61,9 +61,10 @@ class Q_WIDGETS_EXPORT QProgressDialog : public QDialog
     Q_PROPERTY(QString labelText READ labelText WRITE setLabelText)
 
 public:
-    explicit QProgressDialog(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    explicit QProgressDialog(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     QProgressDialog(const QString &labelText, const QString &cancelButtonText,
-                    int minimum, int maximum, QWidget *parent = 0, Qt::WindowFlags flags = 0);
+                    int minimum, int maximum, QWidget *parent = Q_NULLPTR,
+                    Qt::WindowFlags flags = Qt::WindowFlags());
     ~QProgressDialog();
 
     void setLabel(QLabel *label);
diff --git a/src/widgets/dialogs/qwizard.h b/src/widgets/dialogs/qwizard.h
index 517edde377..e456f678ac 100644
--- a/src/widgets/dialogs/qwizard.h
+++ b/src/widgets/dialogs/qwizard.h
@@ -114,7 +114,7 @@ public:
 
     Q_DECLARE_FLAGS(WizardOptions, WizardOption)
 
-    explicit QWizard(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    explicit QWizard(QWidget *parent = Q_NULLPTR, Qt::WindowFlags flags = Qt::WindowFlags());
     ~QWizard();
 
     int addPage(QWizardPage *page);