QtWidgets: replace 0 with \nullptr in documentation

Replace 0 with \nullptr in the documentation.
As a drive-by also replace some 0 with nullptr in the corresponding
code.

Change-Id: I5e5bc1ae892f270d7c3419db1c179053561f1b26
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

3 files changed, 17 insertions, 17 deletions

diff --git a/src/widgets/dialogs/qdialog.cpp b/src/widgets/dialogs/qdialog.cpp
index ebbd2fa9ea..cc04110a30 100644
--- a/src/widgets/dialogs/qdialog.cpp
+++ b/src/widgets/dialogs/qdialog.cpp
@@ -422,7 +422,7 @@ QDialog::~QDialog()
 /*!
   \internal
   This function is called by the push button \a pushButton when it
-  becomes the default button. If \a pushButton is 0, the dialogs
+  becomes the default button. If \a pushButton is \nullptr, the dialogs
   default default button becomes the default button. This is what a
   push button calls when it loses focus.
 */
@@ -1014,7 +1014,7 @@ void QDialog::setExtension(QWidget* extension)
 /*!
     \obsolete
 
-    Returns the dialog's extension or 0 if no extension has been
+    Returns the dialog's extension or \nullptr if no extension has been
     defined.
 
     Instead of using this functionality, we recommend that you simply call
diff --git a/src/widgets/dialogs/qmessagebox.cpp b/src/widgets/dialogs/qmessagebox.cpp
index ac1952a642..c9818624fb 100644
--- a/src/widgets/dialogs/qmessagebox.cpp
+++ b/src/widgets/dialogs/qmessagebox.cpp
@@ -834,7 +834,7 @@ QMessageBox::QMessageBox(QWidget *parent)
     The message box is an \l{Qt::ApplicationModal} {application modal}
     dialog box.
 
-    On \macos, if \a parent is not 0 and you want your message box
+    On \macos, if \a parent is not \nullptr and you want your message box
     to appear as a Qt::Sheet of that parent, set the message box's
     \l{setWindowModality()} {window modality} to Qt::WindowModal
     (default). Otherwise, the message box will be a standard dialog.
@@ -983,7 +983,7 @@ QMessageBox::StandardButton QMessageBox::standardButton(QAbstractButton *button)
     \since 4.2
 
     Returns a pointer corresponding to the standard button \a which,
-    or 0 if the standard button doesn't exist in this message box.
+    or \nullptr if the standard button doesn't exist in this message box.
 
     \sa standardButtons, standardButton()
 */
@@ -1106,7 +1106,7 @@ void QMessageBoxPrivate::detectEscapeButton()
     \since 4.2
 
     Returns the button that was clicked by the user,
-    or 0 if the user hit the \uicontrol Esc key and
+    or \nullptr if the user hit the \uicontrol Esc key and
     no \l{setEscapeButton()}{escape button} was set.
 
     If exec() hasn't been called yet, returns nullptr.
@@ -1173,7 +1173,7 @@ void QMessageBox::setDefaultButton(QMessageBox::StandardButton button)
 /*! \since 5.2
 
     Sets the checkbox \a cb on the message dialog. The message box takes ownership of the checkbox.
-    The argument \a cb can be 0 to remove an existing checkbox from the message box.
+    The argument \a cb can be \nullptr to remove an existing checkbox from the message box.
 
     \sa checkBox()
 */
@@ -1205,7 +1205,7 @@ void QMessageBox::setCheckBox(QCheckBox *cb)
 
 /*! \since 5.2
 
-    Returns the checkbox shown on the dialog. This is 0 if no checkbox is set.
+    Returns the checkbox shown on the dialog. This is \nullptr if no checkbox is set.
     \sa setCheckBox()
 */
 
@@ -1570,7 +1570,7 @@ QList<QAbstractButton *> QMessageBox::buttons() const
     \since 4.5
 
     Returns the button role for the specified \a button. This function returns
-    \l InvalidRole if \a button is 0 or has not been added to the message box.
+    \l InvalidRole if \a button is \nullptr or has not been added to the message box.
 
     \sa buttons(), addButton()
 */
@@ -1835,7 +1835,7 @@ void QMessageBox::about(QWidget *parent, const QString &title, const QString &te
 
 /*!
     Displays a simple message box about Qt, with the given \a title
-    and centered over \a parent (if \a parent is not 0). The message
+    and centered over \a parent (if \a parent is not \nullptr). The message
     includes the version number of Qt being used by the application.
 
     This is useful for inclusion in the \uicontrol Help menu of an application,
diff --git a/src/widgets/dialogs/qwizard.cpp b/src/widgets/dialogs/qwizard.cpp
index 59168ba14d..9345a4b583 100644
--- a/src/widgets/dialogs/qwizard.cpp
+++ b/src/widgets/dialogs/qwizard.cpp
@@ -2374,8 +2374,8 @@ void QWizard::removePage(int id)
 /*!
     \fn QWizardPage *QWizard::page(int id) const
 
-    Returns the page with the given \a id, or 0 if there is no such
-    page.
+    Returns the page with the given \a id, or \nullptr if there is no
+    such page.
 
     \sa addPage(), setPage()
 */
@@ -2462,8 +2462,8 @@ int QWizard::startId() const
 }
 
 /*!
-    Returns a pointer to the current page, or 0 if there is no current
-    page (e.g., before the wizard is shown).
+    Returns a pointer to the current page, or \nullptr if there is no
+    current page (e.g., before the wizard is shown).
 
     This is equivalent to calling page(currentId()).
 
@@ -2954,7 +2954,7 @@ void QWizard::setDefaultProperty(const char *className, const char *property,
 
     Passing 0 shows no side widget.
 
-    When the \a widget is not 0 the wizard reparents it.
+    When the \a widget is not \nullptr the wizard reparents it.
 
     Any previous side widget is hidden.
 
@@ -2963,7 +2963,7 @@ void QWizard::setDefaultProperty(const char *className, const char *property,
 
     All widgets set here will be deleted by the wizard when it is
     destroyed unless you separately reparent the widget after setting
-    some other side widget (or 0).
+    some other side widget (or \nullptr).
 
     By default, no side widget is present.
 */
@@ -2981,7 +2981,7 @@ void QWizard::setSideWidget(QWidget *widget)
 /*!
     \since 4.7
 
-    Returns the widget on the left side of the wizard or 0.
+    Returns the widget on the left side of the wizard or \nullptr.
 
     By default, no side widget is present.
 */
@@ -3969,7 +3969,7 @@ void QWizardPage::registerField(const QString &name, QWidget *widget, const char
 }
 
 /*!
-    Returns the wizard associated with this page, or 0 if this page
+    Returns the wizard associated with this page, or \nullptr if this page
     hasn't been inserted into a QWizard yet.
 
     \sa QWizard::addPage(), QWizard::setPage()