Deprecate constructing QFlags from a pointer

This was used to support QFlags f = 0 initialization, but with 0 used
as a pointer literal now considered bad form, it had been changed many
places to QFlags f = nullptr, which is meaningless and confusing.

Change-Id: I4bc592151c255dc5cab1a232615caecc520f02e8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

114 files changed, 193 insertions, 181 deletions

diff --git a/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp b/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp
index eb75a29ca2..a540b88247 100644
--- a/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp
+++ b/src/corelib/doc/snippets/code/src_corelib_global_qglobal.cpp
@@ -50,6 +50,7 @@
 
 //! [0]
 label->setAlignment(Qt::AlignLeft | Qt::AlignTop);
+label->setAlignment({ });
 //! [0]
 
 
diff --git a/src/corelib/global/qflags.h b/src/corelib/global/qflags.h
index bd3c219968..4f46de5eaa 100644
--- a/src/corelib/global/qflags.h
+++ b/src/corelib/global/qflags.h
@@ -93,8 +93,10 @@ class QFlags
                       "long long will overflow.");
     Q_STATIC_ASSERT_X((std::is_enum<Enum>::value), "QFlags is only usable on enumeration types.");
 
+#if QT_DEPRECATED_SINCE(5,15)
     struct Private;
     typedef int (Private::*Zero);
+#endif
     template <typename E> friend QDataStream &operator>>(QDataStream &, QFlags<E> &);
     template <typename E> friend QDataStream &operator<<(QDataStream &, QFlags<E>);
 public:
@@ -115,8 +117,11 @@ public:
     Q_DECL_CONSTEXPR inline QFlags(const QFlags &other);
     Q_DECL_CONSTEXPR inline QFlags &operator=(const QFlags &other);
 #endif
+    Q_DECL_CONSTEXPR inline QFlags() noexcept : i(0) {}
     Q_DECL_CONSTEXPR inline QFlags(Enum flags) noexcept : i(Int(flags)) {}
-    Q_DECL_CONSTEXPR inline QFlags(Zero = nullptr) noexcept : i(0) {}
+#if QT_DEPRECATED_SINCE(5,15)
+    QT_DEPRECATED_X("Use default constructor instead") Q_DECL_CONSTEXPR inline QFlags(Zero) noexcept : i(0) {}
+#endif
     Q_DECL_CONSTEXPR inline QFlags(QFlag flag) noexcept : i(flag) {}
 
     Q_DECL_CONSTEXPR inline QFlags(std::initializer_list<Enum> flags) noexcept
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp
index 4ab5bd2edb..d95cc786ab 100644
--- a/src/corelib/global/qglobal.cpp
+++ b/src/corelib/global/qglobal.cpp
@@ -250,7 +250,7 @@ Q_STATIC_ASSERT((std::is_same<qsizetype, qptrdiff>::value));
     Qt::Alignment type is simply a typedef for
     QFlags<Qt::AlignmentFlag>. QLabel::setAlignment() takes a
     Qt::Alignment parameter, which means that any combination of
-    Qt::AlignmentFlag values, or 0, is legal:
+    Qt::AlignmentFlag values, or \c{{ }}, is legal:
 
     \snippet code/src_corelib_global_qglobal.cpp 0
 
@@ -318,10 +318,20 @@ Q_STATIC_ASSERT((std::is_same<qsizetype, qptrdiff>::value));
 */
 
 /*!
+    \fn template <typename Enum> QFlags<Enum>::QFlags()
+    \since 5.15
+
+    Constructs a QFlags object with no flags set.
+*/
+
+/*!
     \fn template <typename Enum> QFlags<Enum>::QFlags(Zero)
+    \deprecated
 
     Constructs a QFlags object with no flags set. The parameter must be a
     literal 0 value.
+
+    Deprecated, use default constructor instead.
 */
 
 /*!
diff --git a/src/corelib/io/qabstractfileengine.cpp b/src/corelib/io/qabstractfileengine.cpp
index 8a1679c5af..070139b608 100644
--- a/src/corelib/io/qabstractfileengine.cpp
+++ b/src/corelib/io/qabstractfileengine.cpp
@@ -658,7 +658,7 @@ QStringList QAbstractFileEngine::entryList(QDir::Filters filters, const QStringL
 QAbstractFileEngine::FileFlags QAbstractFileEngine::fileFlags(FileFlags type) const
 {
     Q_UNUSED(type);
-    return nullptr;
+    return {};
 }
 
 /*!
diff --git a/src/corelib/io/qfileinfo.cpp b/src/corelib/io/qfileinfo.cpp
index 93696c1320..3fe1aec41f 100644
--- a/src/corelib/io/qfileinfo.cpp
+++ b/src/corelib/io/qfileinfo.cpp
@@ -134,7 +134,7 @@ uint QFileInfoPrivate::getFileFlags(QAbstractFileEngine::FileFlags request) cons
     // extra syscall. Bundle detecton on Mac can be slow, expecially on network
     // paths, so we separate out that as well.
 
-    QAbstractFileEngine::FileFlags req = nullptr;
+    QAbstractFileEngine::FileFlags req;
     uint cachedFlags = 0;
 
     if (request & (QAbstractFileEngine::FlagsMask | QAbstractFileEngine::TypesMask)) {
diff --git a/src/corelib/io/qfilesystemmetadata_p.h b/src/corelib/io/qfilesystemmetadata_p.h
index 275a4bf8d0..3154658e5c 100644
--- a/src/corelib/io/qfilesystemmetadata_p.h
+++ b/src/corelib/io/qfilesystemmetadata_p.h
@@ -76,8 +76,7 @@ class Q_AUTOTEST_EXPORT QFileSystemMetaData
 {
 public:
     QFileSystemMetaData()
-        : knownFlagsMask(nullptr),
-          size_(-1)
+        : size_(-1)
     {
     }
 
@@ -186,7 +185,7 @@ public:
 
     void clear()
     {
-        knownFlagsMask = nullptr;
+        knownFlagsMask = {};
     }
 
     void clearFlags(MetaDataFlags flags = AllMetaDataFlags)
diff --git a/src/corelib/io/qfsfileengine_win.cpp b/src/corelib/io/qfsfileengine_win.cpp
index 5b868cc447..dd4882a2bc 100644
--- a/src/corelib/io/qfsfileengine_win.cpp
+++ b/src/corelib/io/qfsfileengine_win.cpp
@@ -591,14 +591,14 @@ QAbstractFileEngine::FileFlags QFSFileEngine::fileFlags(QAbstractFileEngine::Fil
     if (type & Refresh)
         d->metaData.clear();
 
-    QAbstractFileEngine::FileFlags ret = 0;
+    QAbstractFileEngine::FileFlags ret;
 
     if (type & FlagsMask)
         ret |= LocalDiskFlag;
 
     bool exists;
     {
-        QFileSystemMetaData::MetaDataFlags queryFlags = 0;
+        QFileSystemMetaData::MetaDataFlags queryFlags;
 
         queryFlags |= QFileSystemMetaData::MetaDataFlags(uint(type))
                 & QFileSystemMetaData::Permissions;
diff --git a/src/corelib/io/qresource.cpp b/src/corelib/io/qresource.cpp
index 22c22ce711..0a145b2be4 100644
--- a/src/corelib/io/qresource.cpp
+++ b/src/corelib/io/qresource.cpp
@@ -1492,7 +1492,7 @@ bool QResourceFileEngine::isSequential() const
 QAbstractFileEngine::FileFlags QResourceFileEngine::fileFlags(QAbstractFileEngine::FileFlags type) const
 {
     Q_D(const QResourceFileEngine);
-    QAbstractFileEngine::FileFlags ret = 0;
+    QAbstractFileEngine::FileFlags ret;
     if(!d->resource.isValid())
         return ret;
 
diff --git a/src/corelib/io/qurl.cpp b/src/corelib/io/qurl.cpp
index 878e007fb0..659552b72f 100644
--- a/src/corelib/io/qurl.cpp
+++ b/src/corelib/io/qurl.cpp
@@ -823,7 +823,7 @@ recodeFromUser(const QString &input, const ushort *actions, int from, int to)
     QString output;
     const QChar *begin = input.constData() + from;
     const QChar *end = input.constData() + to;
-    if (qt_urlRecode(output, begin, end, nullptr, actions))
+    if (qt_urlRecode(output, begin, end, {}, actions))
         return output;
 
     return input.mid(from, to - from);
diff --git a/src/corelib/itemmodels/qabstractitemmodel.cpp b/src/corelib/itemmodels/qabstractitemmodel.cpp
index 88555f9572..fa975ce117 100644
--- a/src/corelib/itemmodels/qabstractitemmodel.cpp
+++ b/src/corelib/itemmodels/qabstractitemmodel.cpp
@@ -432,7 +432,7 @@ Qt::ItemFlags QPersistentModelIndex::flags() const
 {
     if (d)
         return d->index.flags();
-    return 0;
+    return { };
 }
 
 /*!
@@ -2296,7 +2296,7 @@ Qt::ItemFlags QAbstractItemModel::flags(const QModelIndex &index) const
 {
     Q_D(const QAbstractItemModel);
     if (!d->indexValid(index))
-        return 0;
+        return { };
 
     return Qt::ItemIsSelectable|Qt::ItemIsEnabled;
 }
diff --git a/src/corelib/plugin/qlibrary_p.h b/src/corelib/plugin/qlibrary_p.h
index db5afac98e..a58547a2c3 100644
--- a/src/corelib/plugin/qlibrary_p.h
+++ b/src/corelib/plugin/qlibrary_p.h
@@ -96,7 +96,7 @@ public:
     void setLoadHints(QLibrary::LoadHints lh);
 
     static QLibraryPrivate *findOrCreate(const QString &fileName, const QString &version = QString(),
-                                         QLibrary::LoadHints loadHints = nullptr);
+                                         QLibrary::LoadHints loadHints = { });
     static QStringList suffixes_sys(const QString &fullVersion);
     static QStringList prefixes_sys();
 
diff --git a/src/corelib/text/qregularexpression.cpp b/src/corelib/text/qregularexpression.cpp
index 8d2187eb28..d0bdc0d45c 100644
--- a/src/corelib/text/qregularexpression.cpp
+++ b/src/corelib/text/qregularexpression.cpp
@@ -912,7 +912,7 @@ QRegularExpression::QRegularExpression(QRegularExpressionPrivate &dd)
 */
 QRegularExpressionPrivate::QRegularExpressionPrivate()
     : QSharedData(),
-      patternOptions(0),
+      patternOptions(),
       pattern(),
       mutex(),
       compiledPattern(nullptr),
diff --git a/src/corelib/text/qtextboundaryfinder.cpp b/src/corelib/text/qtextboundaryfinder.cpp
index 67dd15377b..070b041220 100644
--- a/src/corelib/text/qtextboundaryfinder.cpp
+++ b/src/corelib/text/qtextboundaryfinder.cpp
@@ -71,7 +71,7 @@ static void init(QTextBoundaryFinder::BoundaryType type, const QChar *chars, int
         }
     }
 
-    QUnicodeTools::CharAttributeOptions options = 0;
+    QUnicodeTools::CharAttributeOptions options;
     switch (type) {
     case QTextBoundaryFinder::Grapheme: options |= QUnicodeTools::GraphemeBreaks; break;
     case QTextBoundaryFinder::Word: options |= QUnicodeTools::WordBreaks; break;
diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp
index 878a2c1e46..accaea988e 100644
--- a/src/corelib/time/qdatetime.cpp
+++ b/src/corelib/time/qdatetime.cpp
@@ -3266,7 +3266,7 @@ inline QDateTime::Data::Data(Qt::TimeSpec spec)
         // the structure is too small, we need to detach
         d = new QDateTimePrivate;
         d->ref.ref();
-        d->m_status = mergeSpec(nullptr, spec);
+        d->m_status = mergeSpec({}, spec);
     }
 }
 
diff --git a/src/corelib/time/qdatetimeparser.cpp b/src/corelib/time/qdatetimeparser.cpp
index 2c566e3584..70d6f280bf 100644
--- a/src/corelib/time/qdatetimeparser.cpp
+++ b/src/corelib/time/qdatetimeparser.cpp
@@ -407,7 +407,7 @@ bool QDateTimeParser::parseFormat(const QString &newFormat)
     QDTPDEBUGN("parseFormat: %s", newFormat.toLatin1().constData());
 
     QVector<SectionNode> newSectionNodes;
-    Sections newDisplay = 0;
+    Sections newDisplay;
     QStringList newSeparators;
     int i, index = 0;
     int add = 0;
@@ -1799,7 +1799,7 @@ int QDateTimeParser::SectionNode::maxChange() const
 
 QDateTimeParser::FieldInfo QDateTimeParser::fieldInfo(int index) const
 {
-    FieldInfo ret = 0;
+    FieldInfo ret;
     const SectionNode &sn = sectionNode(index);
     switch (sn.type) {
     case MSecSection:
diff --git a/src/corelib/time/qdatetimeparser_p.h b/src/corelib/time/qdatetimeparser_p.h
index e9f1455380..ec4e4e4df2 100644
--- a/src/corelib/time/qdatetimeparser_p.h
+++ b/src/corelib/time/qdatetimeparser_p.h
@@ -84,7 +84,7 @@ public:
         DateTimeEdit
     };
     QDateTimeParser(QVariant::Type t, Context ctx, const QCalendar &cal = QCalendar())
-        : currentSectionIndex(-1), display(nullptr), cachedDay(-1), parserType(t),
+        : currentSectionIndex(-1), cachedDay(-1), parserType(t),
         fixday(false), spec(Qt::LocalTime), context(ctx), calendar(cal)
     {
         defaultLocale = QLocale::system();
diff --git a/src/dbus/qdbusconnection.cpp b/src/dbus/qdbusconnection.cpp
index d6f3230fd2..b93dabb3a7 100644
--- a/src/dbus/qdbusconnection.cpp
+++ b/src/dbus/qdbusconnection.cpp
@@ -1139,7 +1139,7 @@ QString QDBusConnection::name() const
 */
 QDBusConnection::ConnectionCapabilities QDBusConnection::connectionCapabilities() const
 {
-    return d ? d->capabilities : ConnectionCapabilities(0);
+    return d ? d->capabilities : ConnectionCapabilities();
 }
 
 /*!
diff --git a/src/dbus/qdbusintegrator.cpp b/src/dbus/qdbusintegrator.cpp
index 28779a41d0..fb4f927a87 100644
--- a/src/dbus/qdbusintegrator.cpp
+++ b/src/dbus/qdbusintegrator.cpp
@@ -1026,7 +1026,7 @@ void QDBusConnectionPrivate::deliverCall(QObject *object, int /*flags*/, const Q
 extern bool qDBusInitThreads();
 
 QDBusConnectionPrivate::QDBusConnectionPrivate(QObject *p)
-    : QObject(p), ref(1), capabilities(0), mode(InvalidMode), busService(0),
+    : QObject(p), ref(1), mode(InvalidMode), busService(0),
       connection(0),
       rootNode(QString(QLatin1Char('/'))),
       anonymousAuthenticationAllowed(false),
@@ -1770,7 +1770,7 @@ void QDBusConnectionPrivate::setPeer(DBusConnection *c, const QDBusErrorInternal
 
 static QDBusConnection::ConnectionCapabilities connectionCapabilies(DBusConnection *connection)
 {
-    QDBusConnection::ConnectionCapabilities result = 0;
+    QDBusConnection::ConnectionCapabilities result;
     typedef dbus_bool_t (*can_send_type_t)(DBusConnection *, int);
     static can_send_type_t can_send_type = 0;
 
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index d8ed0829af..869e206524 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -1912,10 +1912,10 @@ void QImage::invertPixels(InvertMode mode)
     // Inverting premultiplied pixels would produce invalid image data.
     if (hasAlphaChannel() && qPixelLayouts[d->format].premultiplied) {
         if (depth() > 32) {
-            if (!d->convertInPlace(QImage::Format_RGBA64, 0))
+            if (!d->convertInPlace(QImage::Format_RGBA64, { }))
                 *this = convertToFormat(QImage::Format_RGBA64);
         } else {
-            if (!d->convertInPlace(QImage::Format_ARGB32, 0))
+            if (!d->convertInPlace(QImage::Format_ARGB32, { }))
                 *this = convertToFormat(QImage::Format_ARGB32);
         }
     }
@@ -1982,7 +1982,7 @@ void QImage::invertPixels(InvertMode mode)
     }
 
     if (originalFormat != d->format) {
-        if (!d->convertInPlace(originalFormat, 0))
+        if (!d->convertInPlace(originalFormat, { }))
             *this = convertToFormat(originalFormat);
     }
 }
diff --git a/src/gui/kernel/qplatformcursor.cpp b/src/gui/kernel/qplatformcursor.cpp
index 49eff2ad23..34c4549443 100644
--- a/src/gui/kernel/qplatformcursor.cpp
+++ b/src/gui/kernel/qplatformcursor.cpp
@@ -103,7 +103,7 @@ QT_BEGIN_NAMESPACE
                           QPlatformCursor::clearOverrideCursor().
 */
 
-QPlatformCursor::Capabilities QPlatformCursor::m_capabilities = 0;
+QPlatformCursor::Capabilities QPlatformCursor::m_capabilities = { };
 
 /*!
     \fn QPlatformCursor::QPlatformCursor()
diff --git a/src/gui/kernel/qplatformtheme.h b/src/gui/kernel/qplatformtheme.h
index 356c4ea3ea..3185fc4541 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 = nullptr) const;
+                           QPlatformTheme::IconOptions iconOptions = { }) const;
     virtual QIconEngine *createIconEngine(const QString &iconName) const;
 
 #ifndef QT_NO_SHORTCUT
diff --git a/src/gui/kernel/qsimpledrag.cpp b/src/gui/kernel/qsimpledrag.cpp
index d3070a3d1a..803206477c 100644
--- a/src/gui/kernel/qsimpledrag.cpp
+++ b/src/gui/kernel/qsimpledrag.cpp
@@ -393,7 +393,7 @@ void QSimpleDrag::startDrag()
 
 static void sendDragLeave(QWindow *window)
 {
-    QWindowSystemInterface::handleDrag(window, nullptr, QPoint(), Qt::IgnoreAction, 0, 0);
+    QWindowSystemInterface::handleDrag(window, nullptr, QPoint(), Qt::IgnoreAction, { }, { });
 }
 
 void QSimpleDrag::cancel()
diff --git a/src/gui/kernel/qsurfaceformat.cpp b/src/gui/kernel/qsurfaceformat.cpp
index 238886220b..571b820409 100644
--- a/src/gui/kernel/qsurfaceformat.cpp
+++ b/src/gui/kernel/qsurfaceformat.cpp
@@ -57,7 +57,7 @@ QT_BEGIN_NAMESPACE
 class QSurfaceFormatPrivate
 {
 public:
-    explicit QSurfaceFormatPrivate(QSurfaceFormat::FormatOptions _opts = 0)
+    explicit QSurfaceFormatPrivate(QSurfaceFormat::FormatOptions _opts = { })
         : ref(1)
         , opts(_opts)
         , redBufferSize(-1)
diff --git a/src/gui/opengl/qopenglbuffer.cpp b/src/gui/opengl/qopenglbuffer.cpp
index 537097c09f..5ad16a8438 100644
--- a/src/gui/opengl/qopenglbuffer.cpp
+++ b/src/gui/opengl/qopenglbuffer.cpp
@@ -545,9 +545,9 @@ void *QOpenGLBuffer::map(QOpenGLBuffer::Access access)
         qWarning("QOpenGLBuffer::map(): buffer not created");
 #endif
     if (!d->guard || !d->guard->id())
-        return 0;
+        return nullptr;
     if (d->funcs->hasOpenGLExtension(QOpenGLExtensions::MapBufferRange)) {
-        QOpenGLBuffer::RangeAccessFlags rangeAccess = 0;
+        QOpenGLBuffer::RangeAccessFlags rangeAccess;
         switch (access) {
         case QOpenGLBuffer::ReadOnly:
             rangeAccess = QOpenGLBuffer::RangeRead;
diff --git a/src/gui/opengl/qopenglfunctions.cpp b/src/gui/opengl/qopenglfunctions.cpp
index 8ec814296a..42186ace23 100644
--- a/src/gui/opengl/qopenglfunctions.cpp
+++ b/src/gui/opengl/qopenglfunctions.cpp
@@ -489,7 +489,7 @@ QOpenGLFunctions::OpenGLFeatures QOpenGLFunctions::openGLFeatures() const
 {
     QOpenGLFunctionsPrivateEx *d = static_cast<QOpenGLFunctionsPrivateEx *>(d_ptr);
     if (!d)
-        return 0;
+        return { };
     if (d->m_features == -1)
         d->m_features = qt_gl_resolve_features();
     return QOpenGLFunctions::OpenGLFeatures(d->m_features);
@@ -527,7 +527,7 @@ QOpenGLExtensions::OpenGLExtensions QOpenGLExtensions::openGLExtensions()
 {
     QOpenGLFunctionsPrivateEx *d = static_cast<QOpenGLFunctionsPrivateEx *>(d_ptr);
     if (!d)
-        return 0;
+        return { };
     if (d->m_extensions == -1)
         d->m_extensions = qt_gl_resolve_extensions();
     return QOpenGLExtensions::OpenGLExtensions(d->m_extensions);
diff --git a/src/gui/opengl/qopenglpaintengine.cpp b/src/gui/opengl/qopenglpaintengine.cpp
index 47394999c6..20cc2b5ae5 100644
--- a/src/gui/opengl/qopenglpaintengine.cpp
+++ b/src/gui/opengl/qopenglpaintengine.cpp
@@ -1575,7 +1575,7 @@ void QOpenGL2PaintEngineEx::drawImage(const QRectF& dest, const QImage& image, c
     case QImage::Format_ARGB32:
     case QImage::Format_RGBA64:
         d->shaderManager->setSrcPixelType(QOpenGLEngineShaderManager::NonPremultipliedImageSrc);
-        bindOption = 0;
+        bindOption = { };
         break;
     case QImage::Format_Alpha8:
         if (ctx->functions()->hasOpenGLFeature(QOpenGLFunctions::TextureRGFormats)) {
diff --git a/src/gui/painting/qpaintengineex.cpp b/src/gui/painting/qpaintengineex.cpp
index 8314e8bc8a..722afaf119 100644
--- a/src/gui/painting/qpaintengineex.cpp
+++ b/src/gui/painting/qpaintengineex.cpp
@@ -1061,7 +1061,7 @@ void QPaintEngineEx::drawStaticTextItem(QStaticTextItem *staticTextItem)
 
     QFontEngine *fontEngine = staticTextItem->fontEngine();
     fontEngine->addGlyphsToPath(staticTextItem->glyphs, staticTextItem->glyphPositions,
-                                staticTextItem->numGlyphs, &path, 0);
+                                staticTextItem->numGlyphs, &path, { });
     if (!path.isEmpty()) {
         QPainterState *s = state();
         QPainter::RenderHints oldHints = s->renderHints;
diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp
index 3ce54c20be..4336ff66be 100644
--- a/src/gui/painting/qpainter.cpp
+++ b/src/gui/painting/qpainter.cpp
@@ -5902,7 +5902,7 @@ void QPainter::drawText(const QPointF &p, const QString &str, int tf, int justif
         int numGlyphs = len;
         QVarLengthGlyphLayoutArray glyphs(len);
         QFontEngine *fontEngine = d->state->font.d->engineForScript(QChar::Script_Common);
-        if (!fontEngine->stringToCMap(str.data(), len, &glyphs, &numGlyphs, 0))
+        if (!fontEngine->stringToCMap(str.data(), len, &glyphs, &numGlyphs, { }))
             Q_UNREACHABLE();
 
         QTextItemInt gf(glyphs, &d->state->font, str.data(), len, fontEngine);
@@ -6404,7 +6404,7 @@ Q_GUI_EXPORT void qt_draw_decoration_for_glyphs(QPainter *painter, const glyph_t
     }
 
     QFixed width = rightMost - leftMost;
-    QTextItem::RenderFlags flags = 0;
+    QTextItem::RenderFlags flags;
 
     if (font.underline())
         flags |= QTextItem::Underline;
@@ -7213,7 +7213,7 @@ QPainter::RenderHints QPainter::renderHints() const
     Q_D(const QPainter);
 
     if (!d->engine)
-        return 0;
+        return { };
 
     return d->state->renderHints;
 }
@@ -7795,7 +7795,7 @@ QPainterState::QPainterState()
       composition_mode(QPainter::CompositionMode_SourceOver),
       emulationSpecifier(0), changeFlags(0)
 {
-    dirtyFlags = 0;
+    dirtyFlags = { };
 }
 
 QPainterState::~QPainterState()
@@ -7824,9 +7824,9 @@ void QPainterState::init(QPainter *p) {
     layoutDirection = QGuiApplication::layoutDirection();
     composition_mode = QPainter::CompositionMode_SourceOver;
     emulationSpecifier = 0;
-    dirtyFlags = 0;
+    dirtyFlags = { };
     changeFlags = 0;
-    renderHints = 0;
+    renderHints = { };
     opacity = 1;
 }
 
@@ -7883,7 +7883,7 @@ void QPainterState::init(QPainter *p) {
 
 /*!
     \fn void QPainter::drawImage(const QPointF &point, const QImage &image, const QRectF &source,
-                                 Qt::ImageConversionFlags flags = 0)
+                                 Qt::ImageConversionFlags flags = Qt::AutoColor)
 
     \overload
 
@@ -7893,7 +7893,7 @@ void QPainterState::init(QPainter *p) {
 
 /*!
     \fn void QPainter::drawImage(const QPoint &point, const QImage &image, const QRect &source,
-                                 Qt::ImageConversionFlags flags = 0)
+                                 Qt::ImageConversionFlags flags = Qt::AutoColor)
     \overload
 
     Draws the rectangular portion \a source of the given \a image with
diff --git a/src/gui/painting/qplatformbackingstore.cpp b/src/gui/painting/qplatformbackingstore.cpp
index 45e90bd99b..0ecb4390e9 100644
--- a/src/gui/painting/qplatformbackingstore.cpp
+++ b/src/gui/painting/qplatformbackingstore.cpp
@@ -427,7 +427,7 @@ void QPlatformBackingStore::composeAndFlush(QWindow *window, const QRegion &regi
             origin = QOpenGLTextureBlitter::OriginBottomLeft;
         textureId = d_ptr->textureId;
     } else {
-        TextureFlags flags = 0;
+        TextureFlags flags;
         textureId = toTexture(deviceRegion(region, window, offset), &d_ptr->textureSize, &flags);
         d_ptr->needsSwizzle = (flags & TextureSwizzle) != 0;
         d_ptr->premultiplied = (flags & TexturePremultiplied) != 0;
@@ -534,7 +534,7 @@ GLuint QPlatformBackingStore::toTexture(const QRegion &dirtyRegion, QSize *textu
     GLuint pixelType = GL_UNSIGNED_BYTE;
 
     bool needsConversion = false;
-    *flags = 0;
+    *flags = { };
     switch (image.format()) {
     case QImage::Format_ARGB32_Premultiplied:
         *flags |= TexturePremultiplied;
diff --git a/src/gui/painting/qplatformbackingstore.h b/src/gui/painting/qplatformbackingstore.h
index 4f08b0092f..7aa054f1e2 100644
--- a/src/gui/painting/qplatformbackingstore.h
+++ b/src/gui/painting/qplatformbackingstore.h
@@ -100,7 +100,7 @@ public:
     bool isLocked() const;
 
     void appendTexture(void *source, GLuint textureId, const QRect &geometry,
-                       const QRect &clipRect = QRect(), Flags flags = nullptr);
+                       const QRect &clipRect = QRect(), Flags flags = { });
     void clear();
 
  Q_SIGNALS:
diff --git a/src/gui/text/qcssparser.cpp b/src/gui/text/qcssparser.cpp
index 793ef5774b..cf3d8e5ea2 100644
--- a/src/gui/text/qcssparser.cpp
+++ b/src/gui/text/qcssparser.cpp
@@ -682,7 +682,7 @@ bool ValueExtractor::extractOutline(int *borders, QBrush *colors, BorderStyle *s
 
 static Qt::Alignment parseAlignment(const QCss::Value *values, int count)
 {
-    Qt::Alignment a[2] = { 0, 0 };
+    Qt::Alignment a[2] = { { }, { } };
     for (int i = 0; i < qMin(2, count); i++) {
         if (values[i].type != Value::KnownIdentifier)
             break;
diff --git a/src/gui/text/qdistancefield.cpp b/src/gui/text/qdistancefield.cpp
index d8a971c7b7..89f943ca51 100644
--- a/src/gui/text/qdistancefield.cpp
+++ b/src/gui/text/qdistancefield.cpp
@@ -952,7 +952,7 @@ void QDistanceField::setGlyph(QFontEngine *fontEngine, glyph_t glyph, bool doubl
 {
     QFixedPoint position;
     QPainterPath path;
-    fontEngine->addGlyphsToPath(&glyph, &position, 1, &path, 0);
+    fontEngine->addGlyphsToPath(&glyph, &position, 1, &path, { });
     path.translate(-path.boundingRect().topLeft());
     path.setFillRule(Qt::WindingFill);
 
diff --git a/src/gui/text/qfontengine.cpp b/src/gui/text/qfontengine.cpp
index 403a0510fa..3a1f5ed4f4 100644
--- a/src/gui/text/qfontengine.cpp
+++ b/src/gui/text/qfontengine.cpp
@@ -506,7 +506,7 @@ void QFontEngine::getGlyphPositions(const QGlyphLayout &glyphs, const QTransform
                 g.numGlyphs = 1;
                 g.glyphs = &kashidaGlyph;
                 g.advances = &kashidaWidth;
-                recalcAdvances(&g, 0);
+                recalcAdvances(&g, { });
 
                 for (uint k = 0; k < glyphs.justifications[i].nKashidas; ++k) {
                     xpos -= kashidaWidth;
@@ -948,7 +948,7 @@ QImage QFontEngine::alphaMapForGlyph(glyph_t glyph)
     im.fill(Qt::transparent);
     QPainter p(&im);
     p.setRenderHint(QPainter::Antialiasing);
-    addGlyphsToPath(&glyph, &pt, 1, &path, 0);
+    addGlyphsToPath(&glyph, &pt, 1, &path, { });
     p.setPen(Qt::NoPen);
     p.setBrush(Qt::black);
     p.drawPath(path);
diff --git a/src/gui/text/qfontmetrics.cpp b/src/gui/text/qfontmetrics.cpp
index d3e4f11e8c..906047cdb4 100644
--- a/src/gui/text/qfontmetrics.cpp
+++ b/src/gui/text/qfontmetrics.cpp
@@ -562,7 +562,7 @@ int QFontMetrics::width(const QString &text, int len, int flags) const
         int numGlyphs = len;
         QVarLengthGlyphLayoutArray glyphs(numGlyphs);
         QFontEngine *engine = d->engineForScript(QChar::Script_Common);
-        if (!engine->stringToCMap(text.data(), len, &glyphs, &numGlyphs, 0))
+        if (!engine->stringToCMap(text.data(), len, &glyphs, &numGlyphs, { }))
             Q_UNREACHABLE();
 
         QFixed width;
@@ -684,7 +684,7 @@ int QFontMetrics::horizontalAdvance(QChar ch) const
     glyphs.numGlyphs = 1;
     glyphs.glyphs = &glyph;
     glyphs.advances = &advance;
-    engine->recalcAdvances(&glyphs, 0);
+    engine->recalcAdvances(&glyphs, { });
 
     return qRound(advance);
 }
@@ -736,7 +736,7 @@ int QFontMetrics::charWidth(const QString &text, int pos) const
         glyphs.numGlyphs = 1;
         glyphs.glyphs = &glyph;
         glyphs.advances = &advance;
-        engine->recalcAdvances(&glyphs, 0);
+        engine->recalcAdvances(&glyphs, { });
 
         width = qRound(advance);
     }
@@ -1619,7 +1619,7 @@ qreal QFontMetricsF::horizontalAdvance(QChar ch) const
     glyphs.numGlyphs = 1;
     glyphs.glyphs = &glyph;
     glyphs.advances = &advance;
-    engine->recalcAdvances(&glyphs, 0);
+    engine->recalcAdvances(&glyphs, { });
 
     return advance.toReal();
 }
diff --git a/src/gui/text/qglyphrun.cpp b/src/gui/text/qglyphrun.cpp
index 3c16c3bf62..f4cd839f15 100644
--- a/src/gui/text/qglyphrun.cpp
+++ b/src/gui/text/qglyphrun.cpp
@@ -279,7 +279,7 @@ void QGlyphRun::clear()
 {
     detach();
     d->rawFont = QRawFont();
-    d->flags = 0;
+    d->flags = { };
 
     setPositions(QVector<QPointF>());
     setGlyphIndexes(QVector<quint32>());
diff --git a/src/gui/text/qglyphrun_p.h b/src/gui/text/qglyphrun_p.h
index 465c3c7000..46e2a8bbfb 100644
--- a/src/gui/text/qglyphrun_p.h
+++ b/src/gui/text/qglyphrun_p.h
@@ -65,8 +65,7 @@ class QGlyphRunPrivate: public QSharedData
 {
 public:
     QGlyphRunPrivate()
-        : flags(nullptr)
-        , glyphIndexData(glyphIndexes.constData())
+        : glyphIndexData(glyphIndexes.constData())
         , glyphIndexDataSize(0)
         , glyphPositionData(glyphPositions.constData())
         , glyphPositionDataSize(0)
diff --git a/src/gui/text/qrawfont.cpp b/src/gui/text/qrawfont.cpp
index a060448924..e04c8909f3 100644
--- a/src/gui/text/qrawfont.cpp
+++ b/src/gui/text/qrawfont.cpp
@@ -303,7 +303,7 @@ QPainterPath QRawFont::pathForGlyph(quint32 glyphIndex) const
 
     QFixedPoint position;
     QPainterPath path;
-    d->fontEngine->addGlyphsToPath(&glyphIndex, &position, 1, &path, 0);
+    d->fontEngine->addGlyphsToPath(&glyphIndex, &position, 1, &path, { });
     return path;
 }
 
diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp
index 209433dac5..40adc4a3cf 100644
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@@ -1720,7 +1720,7 @@ int QTextEngine::shapeTextWithHarfbuzzNG(const QScriptItem &si,
                         g.glyphs[i] = actualFontEngine->glyphIndex('-');
                         if (Q_LIKELY(g.glyphs[i] != 0)) {
                             QGlyphLayout tmp = g.mid(i, 1);
-                            actualFontEngine->recalcAdvances(&tmp, 0);
+                            actualFontEngine->recalcAdvances(&tmp, { });
                         }
                         g.attributes[i].dontPrint = true;
                     }
@@ -2581,7 +2581,7 @@ static void set(QJustificationPoint *point, int type, const QGlyphLayout &glyph,
             g.numGlyphs = 1;
             g.glyphs = &kashidaGlyph;
             g.advances = &point->kashidaWidth;
-            fe->recalcAdvances(&g, 0);
+            fe->recalcAdvances(&g, { });
 
             if (point->kashidaWidth == 0)
                 point->type = Justification_Prohibited;
@@ -3214,13 +3214,13 @@ QString QTextEngine::elidedText(Qt::TextElideMode mode, const QFixed &width, int
         glyphs.advances = &ellipsisWidth;
 
         if (glyph != 0) {
-            engine->recalcAdvances(&glyphs, 0);
+            engine->recalcAdvances(&glyphs, { });
 
             ellipsisText = ellipsisChar;
         } else {
             glyph = engine->glyphIndex('.');
             if (glyph != 0) {
-                engine->recalcAdvances(&glyphs, 0);
+                engine->recalcAdvances(&glyphs, { });
 
                 ellipsisWidth *= 3;
                 ellipsisText = QStringLiteral("...");
@@ -3928,7 +3928,7 @@ void QTextItemInt::initWithScriptItem(const QScriptItem &si)
 {
     // explicitly initialize flags so that initFontAttributes can be called
     // multiple times on the same TextItem
-    flags = 0;
+    flags = { };
     if (si.analysis.bidiLevel %2)
         flags |= QTextItem::RightToLeft;
     ascent = si.ascent;
diff --git a/src/gui/util/qgridlayoutengine.cpp b/src/gui/util/qgridlayoutengine.cpp
index 33adac40b2..024f0f084e 100644
--- a/src/gui/util/qgridlayoutengine.cpp
+++ b/src/gui/util/qgridlayoutengine.cpp
@@ -1147,7 +1147,7 @@ QLayoutPolicy::ControlTypes QGridLayoutEngine::controlTypes(LayoutSide side) con
     Qt::Orientation orientation = (side == Top || side == Bottom) ? Qt::Vertical : Qt::Horizontal;
     int row = (side == Top || side == Left) ? effectiveFirstRow(orientation)
                                             : effectiveLastRow(orientation);
-    QLayoutPolicy::ControlTypes result = 0;
+    QLayoutPolicy::ControlTypes result;
 
     for (int column = columnCount(orientation) - 1; column >= 0; --column) {
         if (QGridLayoutItem *item = itemAt(row, column, orientation))
diff --git a/src/gui/util/qgridlayoutengine_p.h b/src/gui/util/qgridlayoutengine_p.h
index 5f0e84edb1..181326103b 100644
--- a/src/gui/util/qgridlayoutengine_p.h
+++ b/src/gui/util/qgridlayoutengine_p.h
@@ -276,7 +276,7 @@ class Q_GUI_EXPORT QGridLayoutItem
 {
 public:
     QGridLayoutItem(int row, int column, int rowSpan = 1, int columnSpan = 1,
-                    Qt::Alignment alignment = nullptr);
+                    Qt::Alignment alignment = { });
     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(nullptr), bool snapToPixelGrid = false);
+    QGridLayoutEngine(Qt::Alignment defaultAlignment = { }, 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 777be237a8..915e359673 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 = nullptr;
+    QVulkanWindow::Flags flags;
     QByteArrayList requestedDevExtensions;
     QHash<VkPhysicalDevice, QVulkanInfoVector<QVulkanExtension> > supportedDevExtensions;
     QVector<VkFormat> requestedColorFormats;
diff --git a/src/network/access/qspdyprotocolhandler.cpp b/src/network/access/qspdyprotocolhandler.cpp
index f845235bf7..cc913ce760 100644
--- a/src/network/access/qspdyprotocolhandler.cpp
+++ b/src/network/access/qspdyprotocolhandler.cpp
@@ -613,7 +613,7 @@ void QSpdyProtocolHandler::sendSYN_STREAM(const HttpMessagePair &messagePair,
     QHttpNetworkRequest request = messagePair.first;
     QHttpNetworkReply *reply = messagePair.second;
 
-    ControlFrameFlags flags = 0;
+    ControlFrameFlags flags;
 
     if (!request.uploadByteDevice()) {
         // no upload -> this is the last frame, send the FIN flag
@@ -675,14 +675,14 @@ void QSpdyProtocolHandler::sendRST_STREAM(qint32 streamID, RST_STREAM_STATUS_COD
     char wireData[8];
     appendIntToFourBytes(wireData, streamID);
     appendIntToFourBytes(wireData + 4, statusCode);
-    sendControlFrame(FrameType_RST_STREAM, /* flags = */ 0, wireData, /* length = */ 8);
+    sendControlFrame(FrameType_RST_STREAM, /* flags = */ { }, wireData, /* length = */ 8);
 }
 
 void QSpdyProtocolHandler::sendPING(quint32 pingID)
 {
     char rawData[4];
     appendIntToFourBytes(rawData, pingID);
-    sendControlFrame(FrameType_PING, /* flags = */ 0, rawData, /* length = */ 4);
+    sendControlFrame(FrameType_PING, /* flags = */ { }, rawData, /* length = */ 4);
 }
 
 bool QSpdyProtocolHandler::uploadData(qint32 streamID)
@@ -724,7 +724,7 @@ bool QSpdyProtocolHandler::uploadData(qint32 streamID)
             // nothing to read currently, break the loop
             break;
         } else {
-            DataFrameFlags flags = 0;
+            DataFrameFlags flags;
             // we will send the FIN flag later if appropriate
             qint64 currentWriteSize = sendDataFrame(streamID, flags, currentReadSize, readPointer);
             if (currentWriteSize == -1 || currentWriteSize != currentReadSize) {
@@ -774,7 +774,7 @@ void QSpdyProtocolHandler::sendWINDOW_UPDATE(qint32 streamID, quint32 deltaWindo
     appendIntToFourBytes(windowUpdateData, streamID);
     appendIntToFourBytes(windowUpdateData + 4, deltaWindowSize);
 
-    sendControlFrame(FrameType_WINDOW_UPDATE, /* flags = */ 0, windowUpdateData, /* length = */ 8);
+    sendControlFrame(FrameType_WINDOW_UPDATE, /* flags = */ { }, windowUpdateData, /* length = */ 8);
 }
 
 qint64 QSpdyProtocolHandler::sendDataFrame(qint32 streamID, DataFrameFlags flags,
diff --git a/src/network/kernel/qnetworkinterface_p.h b/src/network/kernel/qnetworkinterface_p.h
index 44e27a7e34..b879a397f2 100644
--- a/src/network/kernel/qnetworkinterface_p.h
+++ b/src/network/kernel/qnetworkinterface_p.h
@@ -82,7 +82,7 @@ public:
 class QNetworkInterfacePrivate: public QSharedData
 {
 public:
-    QNetworkInterfacePrivate() : index(0), flags(nullptr)
+    QNetworkInterfacePrivate() : index(0)
     { }
     ~QNetworkInterfacePrivate()
     { }
diff --git a/src/network/kernel/qnetworkinterface_unix_p.h b/src/network/kernel/qnetworkinterface_unix_p.h
index 553af5a303..e5c8909eca 100644
--- a/src/network/kernel/qnetworkinterface_unix_p.h
+++ b/src/network/kernel/qnetworkinterface_unix_p.h
@@ -80,7 +80,7 @@ QT_BEGIN_NAMESPACE
 
 static QNetworkInterface::InterfaceFlags convertFlags(uint rawFlags)
 {
-    QNetworkInterface::InterfaceFlags flags = nullptr;
+    QNetworkInterface::InterfaceFlags flags;
     flags |= (rawFlags & IFF_UP) ? QNetworkInterface::IsUp : QNetworkInterface::InterfaceFlag(0);
     flags |= (rawFlags & IFF_RUNNING) ? QNetworkInterface::IsRunning : QNetworkInterface::InterfaceFlag(0);
     flags |= (rawFlags & IFF_BROADCAST) ? QNetworkInterface::CanBroadcast : QNetworkInterface::InterfaceFlag(0);
diff --git a/src/network/socket/qlocalsocket_unix.cpp b/src/network/socket/qlocalsocket_unix.cpp
index d1df26d9f1..e7d15f4824 100644
--- a/src/network/socket/qlocalsocket_unix.cpp
+++ b/src/network/socket/qlocalsocket_unix.cpp
@@ -341,7 +341,7 @@ void QLocalSocketPrivate::_q_connectToSocket()
     }
     connectingSocket = -1;
     connectingName.clear();
-    connectingOpenMode = 0;
+    connectingOpenMode = { };
 }
 
 bool QLocalSocket::setSocketDescriptor(qintptr socketDescriptor,
@@ -438,7 +438,7 @@ void QLocalSocket::close()
         ::close(d->connectingSocket);
     d->connectingSocket = -1;
     d->connectingName.clear();
-    d->connectingOpenMode = 0;
+    d->connectingOpenMode = { };
     d->serverName.clear();
     d->fullServerName.clear();
     QIODevice::close();
diff --git a/src/opengl/qglfunctions.cpp b/src/opengl/qglfunctions.cpp
index f22f9f470b..b20311bec4 100644
--- a/src/opengl/qglfunctions.cpp
+++ b/src/opengl/qglfunctions.cpp
@@ -279,7 +279,7 @@ QGLFunctions::OpenGLFeatures QGLFunctions::openGLFeatures() const
 {
     QGLFunctionsPrivateEx *d = static_cast<QGLFunctionsPrivateEx *>(d_ptr);
     if (!d)
-        return 0;
+        return { };
     if (d->m_features == -1)
         d->m_features = qt_gl_resolve_features();
     return QGLFunctions::OpenGLFeatures(d->m_features);
diff --git a/src/platformsupport/eglconvenience/qeglpbuffer_p.h b/src/platformsupport/eglconvenience/qeglpbuffer_p.h
index 8ad2eb7248..a137d0d328 100644
--- a/src/platformsupport/eglconvenience/qeglpbuffer_p.h
+++ b/src/platformsupport/eglconvenience/qeglpbuffer_p.h
@@ -60,7 +60,7 @@ class QEGLPbuffer : public QPlatformOffscreenSurface
 {
 public:
     QEGLPbuffer(EGLDisplay display, const QSurfaceFormat &format, QOffscreenSurface *offscreenSurface,
-                QEGLPlatformContext::Flags flags = nullptr);
+                QEGLPlatformContext::Flags flags = { });
     ~QEGLPbuffer();
 
     QSurfaceFormat format() const override { return m_format; }
diff --git a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
index ed77c57df5..f0388cd29c 100644
--- a/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
+++ b/src/platformsupport/eglconvenience/qeglplatformcontext_p.h
@@ -69,7 +69,7 @@ public:
 
     QEGLPlatformContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share, EGLDisplay display,
                         EGLConfig *config = nullptr, const QVariant &nativeHandle = QVariant(),
-                        Flags flags = nullptr);
+                        Flags flags = { });
     ~QEGLPlatformContext();
 
     void initialize() override;
diff --git a/src/platformsupport/fbconvenience/qfbscreen.cpp b/src/platformsupport/fbconvenience/qfbscreen.cpp
index c42fd879f8..76984dfe5c 100644
--- a/src/platformsupport/fbconvenience/qfbscreen.cpp
+++ b/src/platformsupport/fbconvenience/qfbscreen.cpp
@@ -255,7 +255,7 @@ QFbWindow *QFbScreen::windowForId(WId wid) const
 
 QFbScreen::Flags QFbScreen::flags() const
 {
-    return 0;
+    return { };
 }
 
 QT_END_NAMESPACE
diff --git a/src/platformsupport/input/libinput/qlibinputtouch.cpp b/src/platformsupport/input/libinput/qlibinputtouch.cpp
index ad85360b0e..e3a79be12e 100644
--- a/src/platformsupport/input/libinput/qlibinputtouch.cpp
+++ b/src/platformsupport/input/libinput/qlibinputtouch.cpp
@@ -136,7 +136,7 @@ void QLibInputTouch::processTouchUp(libinput_event_touch *e)
     if (tp) {
         tp->state = Qt::TouchPointReleased;
         // There may not be a Frame event after the last Up. Work this around.
-        Qt::TouchPointStates s = 0;
+        Qt::TouchPointStates s;
         for (int i = 0; i < state->m_points.count(); ++i)
             s |= state->m_points.at(i).state;
         if (s == Qt::TouchPointReleased)
diff --git a/src/platformsupport/kmsconvenience/qkmsdevice.cpp b/src/platformsupport/kmsconvenience/qkmsdevice.cpp
index 92ba9fbcd9..b820fafd50 100644
--- a/src/platformsupport/kmsconvenience/qkmsdevice.cpp
+++ b/src/platformsupport/kmsconvenience/qkmsdevice.cpp
@@ -873,7 +873,7 @@ void QKmsDevice::discoverPlanes()
                 plane.type = QKmsPlane::Type(value);
             } else if (!strcmp(prop->name, "rotation")) {
                 plane.initialRotation = QKmsPlane::Rotations(int(value));
-                plane.availableRotations = 0;
+                plane.availableRotations = { };
                 if (propTypeIs(prop, DRM_MODE_PROP_BITMASK)) {
                     for (int i = 0; i < prop->count_enums; ++i)
                         plane.availableRotations |= QKmsPlane::Rotation(1 << prop->enums[i].value);
diff --git a/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h b/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
index c0da9d8370..f6acf00f39 100644
--- a/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
+++ b/src/platformsupport/themes/genericunix/qgenericunixthemes_p.h
@@ -109,7 +109,7 @@ public:
     QVariant themeHint(ThemeHint hint) const override;
 
     QIcon fileIcon(const QFileInfo &fileInfo,
-                   QPlatformTheme::IconOptions iconOptions = nullptr) const override;
+                   QPlatformTheme::IconOptions iconOptions = { }) const override;
 
     const QPalette *palette(Palette type = SystemPalette) const override;
 
@@ -134,7 +134,7 @@ public:
     QGnomeTheme();
     QVariant themeHint(ThemeHint hint) const override;
     QIcon fileIcon(const QFileInfo &fileInfo,
-                   QPlatformTheme::IconOptions = nullptr) const override;
+                   QPlatformTheme::IconOptions = { }) const override;
     const QFont *font(Font type) const override;
     QString standardButtonText(int button) const override;
 
diff --git a/src/plugins/imageformats/gif/main.cpp b/src/plugins/imageformats/gif/main.cpp
index c171111fac..993871420c 100644
--- a/src/plugins/imageformats/gif/main.cpp
+++ b/src/plugins/imageformats/gif/main.cpp
@@ -62,7 +62,7 @@ QImageIOPlugin::Capabilities QGifPlugin::capabilities(QIODevice *device, const Q
 {
     if (format == "gif" || (device && device->isReadable() && QGifHandler::canRead(device)))
         return Capabilities(CanRead);
-    return 0;
+    return { };
 }
 
 QImageIOHandler *QGifPlugin::create(QIODevice *device, const QByteArray &format) const
diff --git a/src/plugins/imageformats/ico/main.cpp b/src/plugins/imageformats/ico/main.cpp
index baaf33e1fc..b00d8c7fd3 100644
--- a/src/plugins/imageformats/ico/main.cpp
+++ b/src/plugins/imageformats/ico/main.cpp
@@ -46,9 +46,9 @@ QImageIOPlugin::Capabilities QICOPlugin::capabilities(QIODevice *device, const Q
     if (format == "ico" || format == "cur")
         return Capabilities(CanRead | CanWrite);
     if (!format.isEmpty())
-        return 0;
+        return { };
     if (!device->isOpen())
-        return 0;
+        return { };
 
     Capabilities cap;
     if (device->isReadable() && QtIcoHandler::canRead(device))
diff --git a/src/plugins/imageformats/jpeg/main.cpp b/src/plugins/imageformats/jpeg/main.cpp
index 58442053a1..83f13c4a9d 100644
--- a/src/plugins/imageformats/jpeg/main.cpp
+++ b/src/plugins/imageformats/jpeg/main.cpp
@@ -51,9 +51,9 @@ QImageIOPlugin::Capabilities QJpegPlugin::capabilities(QIODevice *device, const
     if (format == "jpeg" || format == "jpg")
         return Capabilities(CanRead | CanWrite);
     if (!format.isEmpty())
-        return 0;
+        return { };
     if (!device->isOpen())
-        return 0;
+        return { };
 
     Capabilities cap;
     if (device->isReadable() && QJpegHandler::canRead(device))
diff --git a/src/plugins/platforminputcontexts/ibus/qibusplatforminputcontext.h b/src/plugins/platforminputcontexts/ibus/qibusplatforminputcontext.h
index 8e7b8df120..e9c9c55f6a 100644
--- a/src/plugins/platforminputcontexts/ibus/qibusplatforminputcontext.h
+++ b/src/plugins/platforminputcontexts/ibus/qibusplatforminputcontext.h
@@ -61,7 +61,7 @@ public:
     explicit QIBusFilterEventWatcher(const QDBusPendingCall &call,
                                      QObject *parent = nullptr,
                                      QWindow *window = nullptr,
-                                     const Qt::KeyboardModifiers modifiers = nullptr,
+                                     const Qt::KeyboardModifiers modifiers = { },
                                      const QVariantList arguments = QVariantList())
     : QDBusPendingCallWatcher(call, parent)
     , m_window(window)
diff --git a/src/plugins/platforms/eglfs/api/qeglfsintegration.cpp b/src/plugins/platforms/eglfs/api/qeglfsintegration.cpp
index 674f579b4f..d3f51c0d0e 100644
--- a/src/plugins/platforms/eglfs/api/qeglfsintegration.cpp
+++ b/src/plugins/platforms/eglfs/api/qeglfsintegration.cpp
@@ -236,7 +236,7 @@ QPlatformOffscreenSurface *QEglFSIntegration::createPlatformOffscreenSurface(QOf
     EGLDisplay dpy = surface->screen() ? static_cast<QEglFSScreen *>(surface->screen()->handle())->display() : display();
     QSurfaceFormat fmt = qt_egl_device_integration()->surfaceFormatFor(surface->requestedFormat());
     if (qt_egl_device_integration()->supportsPBuffers()) {
-        QEGLPlatformContext::Flags flags = 0;
+        QEGLPlatformContext::Flags flags;
         if (!qt_egl_device_integration()->supportsSurfacelessContexts())
             flags |= QEGLPlatformContext::NoSurfaceless;
         return new QEGLPbuffer(dpy, fmt, surface, flags);
diff --git a/src/plugins/platforms/eglfs/api/qeglfswindow.cpp b/src/plugins/platforms/eglfs/api/qeglfswindow.cpp
index 1fed182882..e6b25c02fd 100644
--- a/src/plugins/platforms/eglfs/api/qeglfswindow.cpp
+++ b/src/plugins/platforms/eglfs/api/qeglfswindow.cpp
@@ -186,7 +186,7 @@ void QEglFSWindow::destroy()
 #endif
     }
 
-    m_flags = 0;
+    m_flags = { };
 }
 
 void QEglFSWindow::invalidateSurface()
diff --git a/src/plugins/platforms/ios/optional/nsphotolibrarysupport/qiosfileengineassetslibrary.mm b/src/plugins/platforms/ios/optional/nsphotolibrarysupport/qiosfileengineassetslibrary.mm
index 54152aebf7..c5244a51ad 100644
--- a/src/plugins/platforms/ios/optional/nsphotolibrarysupport/qiosfileengineassetslibrary.mm
+++ b/src/plugins/platforms/ios/optional/nsphotolibrarysupport/qiosfileengineassetslibrary.mm
@@ -373,7 +373,7 @@ bool QIOSFileEngineAssetsLibrary::close()
 
 QAbstractFileEngine::FileFlags QIOSFileEngineAssetsLibrary::fileFlags(QAbstractFileEngine::FileFlags type) const
 {
-    QAbstractFileEngine::FileFlags flags = 0;
+    QAbstractFileEngine::FileFlags flags;
     const bool isDir = (m_assetUrl == QLatin1String("assets-library://"));
     const bool exists = isDir || m_assetUrl == g_iteratorCurrentUrl.localData() || loadAsset();
 
diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index e51c3d0502..cbc930387f 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -455,7 +455,7 @@ void QXcbConnection::printXcbError(const char *message, xcb_generic_error_t *err
 
 static Qt::MouseButtons translateMouseButtons(int s)
 {
-    Qt::MouseButtons ret = 0;
+    Qt::MouseButtons ret;
     if (s & XCB_BUTTON_MASK_1)
         ret |= Qt::LeftButton;
     if (s & XCB_BUTTON_MASK_2)
diff --git a/src/plugins/platforms/xcb/qxcbconnection.h b/src/plugins/platforms/xcb/qxcbconnection.h
index a894944096..62c5e5d79e 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -294,7 +294,7 @@ private:
         int deviceId = 0;
         QTabletEvent::PointerType pointerType = QTabletEvent::UnknownPointer;
         QTabletEvent::TabletDevice tool = QTabletEvent::Stylus;
-        Qt::MouseButtons buttons = 0;
+        Qt::MouseButtons buttons;
         qint64 serialId = 0;
         bool inProximity = false;
         struct ValuatorClassInfo {
@@ -318,8 +318,8 @@ private:
         int horizontalIndex = 0;
         double verticalIncrement = 0;
         double horizontalIncrement = 0;
-        Qt::Orientations orientations = 0;
-        Qt::Orientations legacyOrientations = 0;
+        Qt::Orientations orientations;
+        Qt::Orientations legacyOrientations;
         QPointF lastScrollPosition;
     };
     QHash<int, ScrollingDevice> m_scrollingDevices;
@@ -360,7 +360,7 @@ private:
 
     WindowMapper m_mapper;
 
-    Qt::MouseButtons m_buttonState = nullptr;
+    Qt::MouseButtons m_buttonState;
     Qt::MouseButton m_button = Qt::NoButton;
 
     QXcbWindow *m_focusWindow = nullptr;
diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index 4639185416..fdf59c5ef4 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -424,7 +424,7 @@ QXcbConnection::TouchDeviceData *QXcbConnection::touchDeviceForId(int id)
 QXcbConnection::TouchDeviceData *QXcbConnection::populateTouchDevices(void *info)
 {
     auto *deviceinfo = reinterpret_cast<xcb_input_xi_device_info_t *>(info);
-    QTouchDevice::Capabilities caps = 0;
+    QTouchDevice::Capabilities caps;
     int type = -1;
     int maxTouchPoints = 1;
     bool isTouchDevice = false;
diff --git a/src/plugins/platforms/xcb/qxcbdrag.cpp b/src/plugins/platforms/xcb/qxcbdrag.cpp
index 3d525598ca..eb5b8f808e 100644
--- a/src/plugins/platforms/xcb/qxcbdrag.cpp
+++ b/src/plugins/platforms/xcb/qxcbdrag.cpp
@@ -883,7 +883,7 @@ void QXcbDrag::handleLeave(QPlatformWindow *w, const xcb_client_message_event_t
                 event->data.data32[0], xdnd_dragsource);
     }
 
-    QWindowSystemInterface::handleDrag(w->window(), nullptr, QPoint(), Qt::IgnoreAction, 0, 0);
+    QWindowSystemInterface::handleDrag(w->window(), nullptr, QPoint(), Qt::IgnoreAction, { }, { });
 }
 
 void QXcbDrag::send_leave()
diff --git a/src/plugins/platforms/xcb/qxcbdrag.h b/src/plugins/platforms/xcb/qxcbdrag.h
index 1388e68acc..7bef7a818a 100644
--- a/src/plugins/platforms/xcb/qxcbdrag.h
+++ b/src/plugins/platforms/xcb/qxcbdrag.h
@@ -86,7 +86,7 @@ public:
     void handlePosition(QPlatformWindow *w, const xcb_client_message_event_t *event);
     void handleLeave(QPlatformWindow *w, const xcb_client_message_event_t *event);
     void handleDrop(QPlatformWindow *, const xcb_client_message_event_t *event,
-                    Qt::MouseButtons b = nullptr, Qt::KeyboardModifiers mods = nullptr);
+                    Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });
 
     void handleStatus(const xcb_client_message_event_t *event);
     void handleSelectionRequest(const xcb_selection_request_event_t *event);
@@ -109,7 +109,7 @@ private:
     void init();
 
     void handle_xdnd_position(QPlatformWindow *w, const xcb_client_message_event_t *event,
-                              Qt::MouseButtons b = nullptr, Qt::KeyboardModifiers mods = nullptr);
+                              Qt::MouseButtons b = { }, Qt::KeyboardModifiers mods = { });
     void handle_xdnd_status(const xcb_client_message_event_t *event);
     void send_leave();
 
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 76d3545d35..840bcfd3bb 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -927,7 +927,7 @@ void QXcbWindow::setWindowFlags(Qt::WindowFlags flags)
 
     xcb_change_window_attributes(xcb_connection(), xcb_window(), mask, values);
 
-    QXcbWindowFunctions::WmWindowTypes wmWindowTypes = 0;
+    QXcbWindowFunctions::WmWindowTypes wmWindowTypes;
     if (window()->dynamicPropertyNames().contains(wm_window_type_property_id)) {
         wmWindowTypes = static_cast<QXcbWindowFunctions::WmWindowTypes>(
             window()->property(wm_window_type_property_id).value<int>());
diff --git a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.h b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.h
index 5cfc4df0d0..d38b3ddda3 100644
--- a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.h
+++ b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.h
@@ -72,7 +72,7 @@ public:
 
     QPixmap standardPixmap(StandardPixmap sp, const QSizeF &size) const override;
     QIcon fileIcon(const QFileInfo &fileInfo,
-                   QPlatformTheme::IconOptions iconOptions = nullptr) const override;
+                   QPlatformTheme::IconOptions iconOptions = { }) const override;
 
     QIconEngine *createIconEngine(const QString &iconName) const override;
 
diff --git a/src/printsupport/kernel/qpaintengine_alpha_p.h b/src/printsupport/kernel/qpaintengine_alpha_p.h
index efae442690..bc6ca91017 100644
--- a/src/printsupport/kernel/qpaintengine_alpha_p.h
+++ b/src/printsupport/kernel/qpaintengine_alpha_p.h
@@ -81,7 +81,7 @@ public:
     void drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &s) override;
 
 protected:
-    QAlphaPaintEngine(QAlphaPaintEnginePrivate &data, PaintEngineFeatures devcaps = 0);
+    QAlphaPaintEngine(QAlphaPaintEnginePrivate &data, PaintEngineFeatures devcaps = { });
     QRegion alphaClipping() const;
     bool continueCall() const;
     void flushAndInit(bool init = true);
diff --git a/src/sql/models/qsqltablemodel.cpp b/src/sql/models/qsqltablemodel.cpp
index ba8a6dea36..4b29492134 100644
--- a/src/sql/models/qsqltablemodel.cpp
+++ b/src/sql/models/qsqltablemodel.cpp
@@ -1305,7 +1305,7 @@ Qt::ItemFlags QSqlTableModel::flags(const QModelIndex &index) const
     Q_D(const QSqlTableModel);
     if (index.internalPointer() || index.column() < 0 || index.column() >= d->rec.count()
         || index.row() < 0)
-        return 0;
+        return { };
 
     bool editable = true;
 
diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
index a1b9003c1c..fbcc02accd 100644
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@@ -370,7 +370,7 @@ QFileDialog::QFileDialog(QWidget *parent,
                      const QString &caption,
                      const QString &directory,
                      const QString &filter)
-    : QDialog(*new QFileDialogPrivate, parent, 0)
+    : QDialog(*new QFileDialogPrivate, parent, { })
 {
     Q_D(QFileDialog);
     d->init(QUrl::fromLocalFile(directory), filter, caption);
@@ -380,7 +380,7 @@ QFileDialog::QFileDialog(QWidget *parent,
     \internal
 */
 QFileDialog::QFileDialog(const QFileDialogArgs &args)
-    : QDialog(*new QFileDialogPrivate, args.parent, 0)
+    : QDialog(*new QFileDialogPrivate, args.parent, { })
 {
     Q_D(QFileDialog);
     d->init(args.directory, args.filter, args.caption);
diff --git a/src/widgets/dialogs/qfilesystemmodel_p.h b/src/widgets/dialogs/qfilesystemmodel_p.h
index 844e417e2d..ad98b9ef44 100644
--- a/src/widgets/dialogs/qfilesystemmodel_p.h
+++ b/src/widgets/dialogs/qfilesystemmodel_p.h
@@ -116,7 +116,7 @@ public:
         inline qint64 size() const { if (info && !info->isDir()) return info->size(); return 0; }
         inline QString type() const { if (info) return info->displayType; return QLatin1String(""); }
         inline QDateTime lastModified() const { if (info) return info->lastModified(); return QDateTime(); }
-        inline QFile::Permissions permissions() const { if (info) return info->permissions(); return nullptr; }
+        inline QFile::Permissions permissions() const { if (info) return info->permissions(); return { }; }
         inline bool isReadable() const { return ((permissions() & QFile::ReadUser) != 0); }
         inline bool isWritable() const { return ((permissions() & QFile::WriteUser) != 0); }
         inline bool isExecutable() const { return ((permissions() & QFile::ExeUser) != 0); }
diff --git a/src/widgets/dialogs/qfontdialog.cpp b/src/widgets/dialogs/qfontdialog.cpp
index 7e3592e034..3da829d328 100644
--- a/src/widgets/dialogs/qfontdialog.cpp
+++ b/src/widgets/dialogs/qfontdialog.cpp
@@ -391,7 +391,7 @@ QFont QFontDialog::getFont(bool *ok, const QFont &initial, QWidget *parent, cons
 QFont QFontDialog::getFont(bool *ok, QWidget *parent)
 {
     QFont initial;
-    return QFontDialogPrivate::getFont(ok, initial, parent, QString(), 0);
+    return QFontDialogPrivate::getFont(ok, initial, parent, QString(), { });
 }
 
 QFont QFontDialogPrivate::getFont(bool *ok, const QFont &initial, QWidget *parent,
diff --git a/src/widgets/dialogs/qprogressdialog.cpp b/src/widgets/dialogs/qprogressdialog.cpp
index e1a6bce5b1..189dcd2989 100644
--- a/src/widgets/dialogs/qprogressdialog.cpp
+++ b/src/widgets/dialogs/qprogressdialog.cpp
@@ -492,7 +492,7 @@ void QProgressDialogPrivate::adoptChildWidget(QWidget *c)
         if (c->parentWidget() == q)
             c->hide(); // until after ensureSizeIsAtLeastSizeHint()
         else
-            c->setParent(q, 0);
+            c->setParent(q, { });
     }
     ensureSizeIsAtLeastSizeHint();
     if (c)
diff --git a/src/widgets/dialogs/qwizard.cpp b/src/widgets/dialogs/qwizard.cpp
index 0295241a74..7c4a473976 100644
--- a/src/widgets/dialogs/qwizard.cpp
+++ b/src/widgets/dialogs/qwizard.cpp
@@ -3444,7 +3444,7 @@ int QWizard::nextId() const
     \sa wizard()
 */
 QWizardPage::QWizardPage(QWidget *parent)
-    : QWidget(*new QWizardPagePrivate, parent, 0)
+    : QWidget(*new QWizardPagePrivate, parent, { })
 {
     connect(this, SIGNAL(completeChanged()), this, SLOT(_q_updateCachedCompleteState()));
 }
diff --git a/src/widgets/graphicsview/qgraphicsgridlayoutengine.cpp b/src/widgets/graphicsview/qgraphicsgridlayoutengine.cpp
index 6a8d5c907b..5797d9e539 100644
--- a/src/widgets/graphicsview/qgraphicsgridlayoutengine.cpp
+++ b/src/widgets/graphicsview/qgraphicsgridlayoutengine.cpp
@@ -96,7 +96,7 @@ Qt::Alignment QGraphicsGridLayoutEngine::alignment(QGraphicsLayoutItem *graphics
 {
     if (QGraphicsGridLayoutEngineItem *gridEngineItem = findLayoutItem(graphicsLayoutItem))
         return gridEngineItem->alignment();
-    return 0;
+    return { };
 }
 
 
diff --git a/src/widgets/graphicsview/qgraphicsgridlayoutengine_p.h b/src/widgets/graphicsview/qgraphicsgridlayoutengine_p.h
index e98160e40f..2f2c547977 100644
--- a/src/widgets/graphicsview/qgraphicsgridlayoutengine_p.h
+++ b/src/widgets/graphicsview/qgraphicsgridlayoutengine_p.h
@@ -68,7 +68,7 @@ class QGraphicsLayoutPrivate;
 class QGraphicsGridLayoutEngineItem : public QGridLayoutItem {
 public:
     QGraphicsGridLayoutEngineItem(QGraphicsLayoutItem *item, int row, int columns, int rowSpan = 1, int columnSpan = 1,
-                            Qt::Alignment alignment = nullptr)
+                            Qt::Alignment alignment = { })
         : QGridLayoutItem(row, columns, rowSpan, columnSpan, alignment), q_layoutItem(item) {}
 
     virtual QLayoutPolicy::Policy sizePolicy(Qt::Orientation orientation) const override
diff --git a/src/widgets/graphicsview/qgraphicslinearlayout.cpp b/src/widgets/graphicsview/qgraphicslinearlayout.cpp
index 8964b3b77a..22633df4e3 100644
--- a/src/widgets/graphicsview/qgraphicslinearlayout.cpp
+++ b/src/widgets/graphicsview/qgraphicslinearlayout.cpp
@@ -280,7 +280,7 @@ void QGraphicsLinearLayout::insertItem(int index, QGraphicsLayoutItem *item)
     Q_ASSERT(item);
     d->fixIndex(&index);
     d->engine.insertRow(index, d->orientation);
-    QGraphicsGridLayoutEngineItem *gridEngineItem = new QGraphicsGridLayoutEngineItem(item, d->gridRow(index), d->gridColumn(index), 1, 1, 0);
+    QGraphicsGridLayoutEngineItem *gridEngineItem = new QGraphicsGridLayoutEngineItem(item, d->gridRow(index), d->gridColumn(index), 1, 1, { });
     d->engine.insertItem(gridEngineItem, index);
     invalidate();
 }
diff --git a/src/widgets/graphicsview/qgraphicsproxywidget.cpp b/src/widgets/graphicsview/qgraphicsproxywidget.cpp
index 7413a26261..c60dca7a90 100644
--- a/src/widgets/graphicsview/qgraphicsproxywidget.cpp
+++ b/src/widgets/graphicsview/qgraphicsproxywidget.cpp
@@ -235,7 +235,7 @@ void QGraphicsProxyWidgetPrivate::sendWidgetMouseEvent(QGraphicsSceneHoverEvent
     mouseEvent.setPos(event->pos());
     mouseEvent.setScreenPos(event->screenPos());
     mouseEvent.setButton(Qt::NoButton);
-    mouseEvent.setButtons(0);
+    mouseEvent.setButtons({ });
     mouseEvent.setModifiers(event->modifiers());
     sendWidgetMouseEvent(&mouseEvent);
     event->setAccepted(mouseEvent.isAccepted());
diff --git a/src/widgets/graphicsview/qgraphicsview.cpp b/src/widgets/graphicsview/qgraphicsview.cpp
index 57be850829..f1ed0f3b4e 100644
--- a/src/widgets/graphicsview/qgraphicsview.cpp
+++ b/src/widgets/graphicsview/qgraphicsview.cpp
@@ -348,7 +348,7 @@ QGraphicsViewPrivate::QGraphicsViewPrivate()
       hasUpdateClip(false),
       mousePressButton(Qt::NoButton),
       leftIndent(0), topIndent(0),
-      lastMouseEvent(QEvent::None, QPointF(), QPointF(), QPointF(), Qt::NoButton, 0, 0),
+      lastMouseEvent(QEvent::None, QPointF(), QPointF(), QPointF(), Qt::NoButton, { }, { }),
       alignment(Qt::AlignCenter),
       transformationAnchor(QGraphicsView::AnchorViewCenter), resizeAnchor(QGraphicsView::NoAnchor),
       viewportUpdateMode(QGraphicsView::MinimalViewportUpdate),
@@ -1170,7 +1170,7 @@ void QGraphicsViewPrivate::updateInputMethodSensitivity()
     q->viewport()->setAttribute(Qt::WA_InputMethodEnabled, enabled);
 
     if (!enabled) {
-        q->setInputMethodHints(0);
+        q->setInputMethodHints({ });
         return;
     }
 
@@ -1183,7 +1183,7 @@ void QGraphicsViewPrivate::updateInputMethodSensitivity()
             widget = fw;
         q->setInputMethodHints(widget->inputMethodHints());
     } else {
-        q->setInputMethodHints(0);
+        q->setInputMethodHints({ });
     }
 }
 
diff --git a/src/widgets/itemviews/qcolumnviewgrip.cpp b/src/widgets/itemviews/qcolumnviewgrip.cpp
index 4a4237805f..00cd7df20a 100644
--- a/src/widgets/itemviews/qcolumnviewgrip.cpp
+++ b/src/widgets/itemviews/qcolumnviewgrip.cpp
@@ -65,7 +65,7 @@ QT_BEGIN_NAMESPACE
     Use setModel() to set the model.
 */
 QColumnViewGrip::QColumnViewGrip(QWidget *parent)
-:  QWidget(*new QColumnViewGripPrivate, parent, 0)
+    :  QWidget(*new QColumnViewGripPrivate, parent, { })
 {
 #ifndef QT_NO_CURSOR
     setCursor(Qt::SplitHCursor);
diff --git a/src/widgets/itemviews/qcolumnviewgrip_p.h b/src/widgets/itemviews/qcolumnviewgrip_p.h
index 4311edbeb4..13e4c764e8 100644
--- a/src/widgets/itemviews/qcolumnviewgrip_p.h
+++ b/src/widgets/itemviews/qcolumnviewgrip_p.h
@@ -73,7 +73,7 @@ public:
     int moveGrip(int offset);
 
 protected:
-    QColumnViewGrip(QColumnViewGripPrivate &, QWidget *parent = nullptr, Qt::WindowFlags f = nullptr);
+    QColumnViewGrip(QColumnViewGripPrivate &, QWidget *parent = nullptr, Qt::WindowFlags f = { });
     void paintEvent(QPaintEvent *event) override;
     void mouseDoubleClickEvent(QMouseEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;
diff --git a/src/widgets/kernel/qformlayout.cpp b/src/widgets/kernel/qformlayout.cpp
index 6f7527c013..1c8b997dcb 100644
--- a/src/widgets/kernel/qformlayout.cpp
+++ b/src/widgets/kernel/qformlayout.cpp
@@ -1696,7 +1696,7 @@ Qt::Orientations QFormLayout::expandingDirections() const
     QFormLayoutPrivate *e = const_cast<QFormLayoutPrivate *>(d);
     e->updateSizes();
 
-    Qt::Orientations o = 0;
+    Qt::Orientations o;
     if (e->expandHorizontal)
         o = Qt::Horizontal;
     if (e->expandVertical)
@@ -2326,7 +2326,7 @@ void QFormLayout::resetRowWrapPolicy()
 void QFormLayout::resetFormAlignment()
 {
     Q_D(QFormLayout);
-    d->formAlignment = 0;
+    d->formAlignment = { };
 }
 
 /*!
@@ -2336,7 +2336,7 @@ void QFormLayout::resetFormAlignment()
 void QFormLayout::resetLabelAlignment()
 {
     Q_D(QFormLayout);
-    d->labelAlignment = 0;
+    d->labelAlignment = { };
 }
 
 #if 0
diff --git a/src/widgets/kernel/qgesture_p.h b/src/widgets/kernel/qgesture_p.h
index cbf8d60892..057302bda1 100644
--- a/src/widgets/kernel/qgesture_p.h
+++ b/src/widgets/kernel/qgesture_p.h
@@ -111,8 +111,7 @@ class QPinchGesturePrivate : public QGesturePrivate
 
 public:
     QPinchGesturePrivate()
-        : totalChangeFlags(nullptr), changeFlags(nullptr),
-          totalScaleFactor(1), lastScaleFactor(1), scaleFactor(1),
+        : totalScaleFactor(1), lastScaleFactor(1), scaleFactor(1),
           totalRotationAngle(0), lastRotationAngle(0), rotationAngle(0),
           isNewSequence(true)
     {
diff --git a/src/widgets/kernel/qlayout.cpp b/src/widgets/kernel/qlayout.cpp
index bd06ead6f7..f0f4fc5505 100644
--- a/src/widgets/kernel/qlayout.cpp
+++ b/src/widgets/kernel/qlayout.cpp
@@ -1337,7 +1337,7 @@ QRect QLayout::alignmentRect(const QRect &r) const
       returned by QLayoutItems that have an alignment.
     */
     QLayout *that = const_cast<QLayout *>(this);
-    that->setAlignment(0);
+    that->setAlignment({ });
     QSize ms = that->maximumSize();
     that->setAlignment(a);
 
diff --git a/src/widgets/kernel/qlayoutengine_p.h b/src/widgets/kernel/qlayoutengine_p.h
index 948c2424e6..2999bae646 100644
--- a/src/widgets/kernel/qlayoutengine_p.h
+++ b/src/widgets/kernel/qlayoutengine_p.h
@@ -105,9 +105,9 @@ Q_WIDGETS_EXPORT QSize qSmartMinSize(const QWidgetItem *i);
 Q_WIDGETS_EXPORT QSize qSmartMinSize(const QWidget *w);
 Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QSize &sizeHint,
                                  const QSize &minSize, const QSize &maxSize,
-                                 const QSizePolicy &sizePolicy, Qt::Alignment align = nullptr);
-Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidgetItem *i, Qt::Alignment align = nullptr);
-Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidget *w, Qt::Alignment align = nullptr);
+                                 const QSizePolicy &sizePolicy, Qt::Alignment align = { });
+Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidgetItem *i, Qt::Alignment align = { });
+Q_WIDGETS_EXPORT QSize qSmartMaxSize(const QWidget *w, Qt::Alignment align = { });
 
 Q_WIDGETS_EXPORT int qSmartSpacing(const QLayout *layout, QStyle::PixelMetric pm);
 
diff --git a/src/widgets/kernel/qstandardgestures.cpp b/src/widgets/kernel/qstandardgestures.cpp
index 8a95b12d89..a5c204d59d 100644
--- a/src/widgets/kernel/qstandardgestures.cpp
+++ b/src/widgets/kernel/qstandardgestures.cpp
@@ -183,7 +183,7 @@ QGestureRecognizer::Result QPinchGestureRecognizer::recognize(QGesture *state,
     }
     case QEvent::TouchUpdate: {
         const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);
-        d->changeFlags = 0;
+        d->changeFlags = { };
         if (ev->touchPoints().size() == 2) {
             QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);
             QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);
@@ -256,7 +256,7 @@ void QPinchGestureRecognizer::reset(QGesture *state)
     QPinchGesture *pinch = static_cast<QPinchGesture *>(state);
     QPinchGesturePrivate *d = pinch->d_func();
 
-    d->totalChangeFlags = d->changeFlags = 0;
+    d->totalChangeFlags = d->changeFlags = { };
 
     d->startCenterPoint = d->lastCenterPoint = d->centerPoint = QPointF();
     d->totalScaleFactor = d->lastScaleFactor = d->scaleFactor = 1;
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index e9968e41b4..e96e06d874 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -396,7 +396,7 @@ void QWidget::setAutoFillBackground(bool enabled)
             If it is \nullptr (the default), the new widget will be a window.
             If not, it will be a child of \e parent, and be constrained by
             \e parent's geometry (unless you specify Qt::Window as window flag).
-        \li  \c{Qt::WindowFlags f = 0} (where available) sets the window flags;
+        \li  \c{Qt::WindowFlags f = { }} (where available) sets the window flags;
             the default is suitable for almost all widgets, but to get, for
             example, a window without a window system frame, you must use
             special flags.
@@ -1595,7 +1595,7 @@ void QWidgetPrivate::createTLExtra()
         x->basew = x->baseh = 0;
         x->frameStrut.setCoords(0, 0, 0, 0);
         x->normalGeometry = QRect(0,0,-1,-1);
-        x->savedFlags = 0;
+        x->savedFlags = { };
         x->opacity = 255;
         x->posIncludesFrame = 0;
         x->sizeAdjusted = false;
diff --git a/src/widgets/kernel/qwidget_p.h b/src/widgets/kernel/qwidget_p.h
index 698928b0b0..62da3fabf4 100644
--- a/src/widgets/kernel/qwidget_p.h
+++ b/src/widgets/kernel/qwidget_p.h
@@ -592,7 +592,7 @@ public:
         Q_Q(QWidget);
         return q->testAttribute(Qt::WA_AlwaysStackOnTop)
             ? QPlatformTextureList::StacksOnTop
-            : QPlatformTextureList::Flags(nullptr);
+            : QPlatformTextureList::Flags();
     }
     virtual QImage grabFramebuffer() { return QImage(); }
     virtual void beginBackingStorePainting() { }
diff --git a/src/widgets/kernel/qwindowcontainer_p.h b/src/widgets/kernel/qwindowcontainer_p.h
index c6de168c10..72474077aa 100644
--- a/src/widgets/kernel/qwindowcontainer_p.h
+++ b/src/widgets/kernel/qwindowcontainer_p.h
@@ -64,7 +64,7 @@ class Q_WIDGETS_EXPORT QWindowContainer : public QWidget
     Q_DECLARE_PRIVATE(QWindowContainer)
 
 public:
-    explicit QWindowContainer(QWindow *embeddedWindow, QWidget *parent = nullptr, Qt::WindowFlags f = nullptr);
+    explicit QWindowContainer(QWindow *embeddedWindow, QWidget *parent = nullptr, Qt::WindowFlags f = { });
     ~QWindowContainer();
     QWindow *containedWindow() const;
 
diff --git a/src/widgets/styles/qstylesheetstyle.cpp b/src/widgets/styles/qstylesheetstyle.cpp
index 0568d749c8..24a397a274 100644
--- a/src/widgets/styles/qstylesheetstyle.cpp
+++ b/src/widgets/styles/qstylesheetstyle.cpp
@@ -479,7 +479,7 @@ struct QStyleSheetGeometryData : public QSharedData
 
 struct QStyleSheetPositionData : public QSharedData
 {
-    QStyleSheetPositionData(int l, int t, int r, int b, Origin o, Qt::Alignment p, QCss::PositionMode m, Qt::Alignment a = 0)
+    QStyleSheetPositionData(int l, int t, int r, int b, Origin o, Qt::Alignment p, QCss::PositionMode m, Qt::Alignment a = { })
         : left(l), top(t), bottom(b), right(r), origin(o), position(p), mode(m), textAlignment(a) { }
 
     int left, top, bottom, right;
@@ -922,9 +922,9 @@ QRenderRule::QRenderRule(const QVector<Declaration> &declarations, const QObject
 
     int left = 0, top = 0, right = 0, bottom = 0;
     Origin origin = Origin_Unknown;
-    Qt::Alignment position = 0;
+    Qt::Alignment position;
     QCss::PositionMode mode = PositionMode_Unknown;
-    Qt::Alignment textAlignment = 0;
+    Qt::Alignment textAlignment;
     if (v.extractPosition(&left, &top, &right, &bottom, &origin, &position, &mode, &textAlignment))
         p = new QStyleSheetPositionData(left, top, right, bottom, origin, position, mode, textAlignment);
 
@@ -2231,7 +2231,7 @@ static Qt::Alignment defaultPosition(int pe)
         return Qt::AlignRight | Qt::AlignVCenter;
 
     default:
-        return 0;
+        return { };
     }
 }
 
@@ -3341,7 +3341,7 @@ void QStyleSheetStyle::drawComplexControl(ComplexControl cc, const QStyleOptionC
                 layout = subControlLayout(QLatin1String("mNX"));
 
             QStyleOptionComplex optCopy(*opt);
-            optCopy.subControls = 0;
+            optCopy.subControls = { };
             for (int i = 0; i < layout.count(); i++) {
                 int layoutButton = layout[i].toInt();
                 if (layoutButton < PseudoElement_MdiCloseButton
@@ -4242,7 +4242,7 @@ void QStyleSheetStyle::drawControl(ControlElement ce, const QStyleOption *opt, Q
                 }
                 r = subRule.contentsRect(r);
 
-                Qt::Alignment alignment = 0;
+                Qt::Alignment alignment;
                 if (subRule.hasPosition())
                     alignment = subRule.position()->textAlignment;
                 if (alignment == 0)
diff --git a/src/widgets/widgets/qabstractbutton.cpp b/src/widgets/widgets/qabstractbutton.cpp
index d956d2ba23..19528d61d2 100644
--- a/src/widgets/widgets/qabstractbutton.cpp
+++ b/src/widgets/widgets/qabstractbutton.cpp
@@ -468,7 +468,7 @@ void QAbstractButtonPrivate::emitToggled(bool checked)
     Constructs an abstract button with a \a parent.
 */
 QAbstractButton::QAbstractButton(QWidget *parent)
-    : QWidget(*new QAbstractButtonPrivate, parent, 0)
+    : QWidget(*new QAbstractButtonPrivate, parent, { })
 {
     Q_D(QAbstractButton);
     d->init();
@@ -490,7 +490,7 @@ QAbstractButton::QAbstractButton(QWidget *parent)
 /*! \internal
  */
 QAbstractButton::QAbstractButton(QAbstractButtonPrivate &dd, QWidget *parent)
-    : QWidget(dd, parent, 0)
+    : QWidget(dd, parent, { })
 {
     Q_D(QAbstractButton);
     d->init();
diff --git a/src/widgets/widgets/qabstractslider.cpp b/src/widgets/widgets/qabstractslider.cpp
index dc325ab871..a0611565b8 100644
--- a/src/widgets/widgets/qabstractslider.cpp
+++ b/src/widgets/widgets/qabstractslider.cpp
@@ -273,13 +273,13 @@ void QAbstractSliderPrivate::setSteps(int single, int page)
     \l value of 0.
 */
 QAbstractSlider::QAbstractSlider(QWidget *parent)
-    :QWidget(*new QAbstractSliderPrivate, parent, 0)
+    :QWidget(*new QAbstractSliderPrivate, parent, { })
 {
 }
 
 /*! \internal */
 QAbstractSlider::QAbstractSlider(QAbstractSliderPrivate &dd, QWidget *parent)
-    :QWidget(dd, parent, 0)
+    :QWidget(dd, parent, { })
 {
 }
 
diff --git a/src/widgets/widgets/qabstractspinbox.cpp b/src/widgets/widgets/qabstractspinbox.cpp
index fc19e0793e..b1e1c9bc1b 100644
--- a/src/widgets/widgets/qabstractspinbox.cpp
+++ b/src/widgets/widgets/qabstractspinbox.cpp
@@ -147,7 +147,7 @@ QT_BEGIN_NAMESPACE
 */
 
 QAbstractSpinBox::QAbstractSpinBox(QWidget *parent)
-    : QWidget(*new QAbstractSpinBoxPrivate, parent, 0)
+    : QWidget(*new QAbstractSpinBoxPrivate, parent, { })
 {
     Q_D(QAbstractSpinBox);
     d->init();
@@ -157,7 +157,7 @@ QAbstractSpinBox::QAbstractSpinBox(QWidget *parent)
     \internal
 */
 QAbstractSpinBox::QAbstractSpinBox(QAbstractSpinBoxPrivate &dd, QWidget *parent)
-    : QWidget(dd, parent, 0)
+    : QWidget(dd, parent, { })
 {
     Q_D(QAbstractSpinBox);
     d->init();
diff --git a/src/widgets/widgets/qcalendarwidget.cpp b/src/widgets/widgets/qcalendarwidget.cpp
index 8593001f8b..749ae96df2 100644
--- a/src/widgets/widgets/qcalendarwidget.cpp
+++ b/src/widgets/widgets/qcalendarwidget.cpp
@@ -1207,9 +1207,9 @@ Qt::ItemFlags QCalendarModel::flags(const QModelIndex &index) const
     if (!date.isValid())
         return QAbstractTableModel::flags(index);
     if (date < m_minimumDate)
-        return 0;
+        return { };
     if (date > m_maximumDate)
-        return 0;
+        return { };
     return QAbstractTableModel::flags(index);
 }
 
@@ -2135,7 +2135,7 @@ void QCalendarWidgetPrivate::_q_editingFinished()
     \sa setCurrentPage()
 */
 QCalendarWidget::QCalendarWidget(QWidget *parent)
-    : QWidget(*new QCalendarWidgetPrivate, parent, 0)
+    : QWidget(*new QCalendarWidgetPrivate, parent, { })
 {
     Q_D(QCalendarWidget);
 
diff --git a/src/widgets/widgets/qcombobox.cpp b/src/widgets/widgets/qcombobox.cpp
index 2d21187317..03dcde0a58 100644
--- a/src/widgets/widgets/qcombobox.cpp
+++ b/src/widgets/widgets/qcombobox.cpp
@@ -931,7 +931,7 @@ QStyleOptionComboBox QComboBoxPrivateContainer::comboStyleOption() const
     model QStandardItemModel.
 */
 QComboBox::QComboBox(QWidget *parent)
-    : QWidget(*new QComboBoxPrivate(), parent, 0)
+    : QWidget(*new QComboBoxPrivate(), parent, { })
 {
     Q_D(QComboBox);
     d->init();
@@ -941,7 +941,7 @@ QComboBox::QComboBox(QWidget *parent)
   \internal
 */
 QComboBox::QComboBox(QComboBoxPrivate &dd, QWidget *parent)
-    : QWidget(dd, parent, 0)
+    : QWidget(dd, parent, { })
 {
     Q_D(QComboBox);
     d->init();
diff --git a/src/widgets/widgets/qdatetimeedit.cpp b/src/widgets/widgets/qdatetimeedit.cpp
index e26993fb23..f7763ce27b 100644
--- a/src/widgets/widgets/qdatetimeedit.cpp
+++ b/src/widgets/widgets/qdatetimeedit.cpp
@@ -1421,7 +1421,7 @@ QDateTimeEdit::StepEnabled QDateTimeEdit::stepEnabled() const
         return (d->minimum == d->maximum ? StepEnabled(0) : StepEnabled(StepUpEnabled));
     }
 
-    QAbstractSpinBox::StepEnabled ret = 0;
+    QAbstractSpinBox::StepEnabled ret = { };
 
 #ifdef QT_KEYPAD_NAVIGATION
     if (QApplicationPrivate::keypadNavigationEnabled() && !hasEditFocus()) {
@@ -1456,7 +1456,7 @@ QDateTimeEdit::StepEnabled QDateTimeEdit::stepEnabled() const
     switch (d->sectionType(d->currentSectionIndex)) {
     case QDateTimeParser::NoSection:
     case QDateTimeParser::FirstSection:
-    case QDateTimeParser::LastSection: return 0;
+    case QDateTimeParser::LastSection: return { };
     default: break;
     }
     if (d->wrapping)
@@ -1659,12 +1659,11 @@ QDateTimeEditPrivate::QDateTimeEditPrivate()
     cacheGuard = false;
     fixday = true;
     type = QVariant::DateTime;
-    sections = 0;
+    sections = { };
     cachedDay = -1;
     currentSectionIndex = FirstSectionIndex;
 
     first.pos = 0;
-    sections = 0;
     calendarPopup = false;
     minimum = QDATETIMEEDIT_COMPAT_DATE_MIN.startOfDay();
     maximum = QDATETIMEEDIT_DATE_MAX.endOfDay();
@@ -2256,7 +2255,7 @@ QDateTimeEdit::Section QDateTimeEditPrivate::convertToPublic(QDateTimeParser::Se
 
 QDateTimeEdit::Sections QDateTimeEditPrivate::convertSections(QDateTimeParser::Sections s)
 {
-    QDateTimeEdit::Sections ret = 0;
+    QDateTimeEdit::Sections ret;
     if (s & QDateTimeParser::MSecSection)
         ret |= QDateTimeEdit::MSecSection;
     if (s & QDateTimeParser::SecondSection)
diff --git a/src/widgets/widgets/qdialogbuttonbox.cpp b/src/widgets/widgets/qdialogbuttonbox.cpp
index 28f6cdc7bd..9096ee82f6 100644
--- a/src/widgets/widgets/qdialogbuttonbox.cpp
+++ b/src/widgets/widgets/qdialogbuttonbox.cpp
@@ -482,7 +482,7 @@ QDialogButtonBox::QDialogButtonBox(QWidget *parent)
     \sa orientation, addButton()
 */
 QDialogButtonBox::QDialogButtonBox(Qt::Orientation orientation, QWidget *parent)
-    : QWidget(*new QDialogButtonBoxPrivate(orientation), parent, 0)
+    : QWidget(*new QDialogButtonBoxPrivate(orientation), parent, { })
 {
     d_func()->initLayout();
 }
diff --git a/src/widgets/widgets/qdockwidget.cpp b/src/widgets/widgets/qdockwidget.cpp
index 05ec3aface..687ef8ba29 100644
--- a/src/widgets/widgets/qdockwidget.cpp
+++ b/src/widgets/widgets/qdockwidget.cpp
@@ -238,8 +238,8 @@ void QDockWidgetTitleButton::paintEvent(QPaintEvent *)
     }
 
     opt.icon = icon();
-    opt.subControls = 0;
-    opt.activeSubControls = 0;
+    opt.subControls = { };
+    opt.activeSubControls = { };
     opt.features = QStyleOptionToolButton::None;
     opt.arrowType = Qt::NoArrow;
     opt.iconSize = dockButtonIconSize();
diff --git a/src/widgets/widgets/qeffects.cpp b/src/widgets/widgets/qeffects.cpp
index 7069ef0368..e69366d7c8 100644
--- a/src/widgets/widgets/qeffects.cpp
+++ b/src/widgets/widgets/qeffects.cpp
@@ -65,7 +65,7 @@ class QAlphaWidget: public QWidget, private QEffects
 {
     Q_OBJECT
 public:
-    QAlphaWidget(QWidget* w, Qt::WindowFlags f = 0);
+    QAlphaWidget(QWidget* w, Qt::WindowFlags f = { });
     ~QAlphaWidget();
 
     void run(int time);
diff --git a/src/widgets/widgets/qfocusframe.cpp b/src/widgets/widgets/qfocusframe.cpp
index 0992becdf0..ee24e92c7e 100644
--- a/src/widgets/widgets/qfocusframe.cpp
+++ b/src/widgets/widgets/qfocusframe.cpp
@@ -154,7 +154,7 @@ void QFocusFrame::initStyleOption(QStyleOption *option) const
 */
 
 QFocusFrame::QFocusFrame(QWidget *parent)
-    : QWidget(*new QFocusFramePrivate, parent, 0)
+    : QWidget(*new QFocusFramePrivate, parent, { })
 {
     setAttribute(Qt::WA_TransparentForMouseEvents);
     setFocusPolicy(Qt::NoFocus);
diff --git a/src/widgets/widgets/qgroupbox.cpp b/src/widgets/widgets/qgroupbox.cpp
index eec794562a..f7fe072302 100644
--- a/src/widgets/widgets/qgroupbox.cpp
+++ b/src/widgets/widgets/qgroupbox.cpp
@@ -178,7 +178,7 @@ void QGroupBoxPrivate::click()
 */
 
 QGroupBox::QGroupBox(QWidget *parent)
-    : QWidget(*new QGroupBoxPrivate, parent, 0)
+    : QWidget(*new QGroupBoxPrivate, parent, { })
 {
     Q_D(QGroupBox);
     d->init();
diff --git a/src/widgets/widgets/qkeysequenceedit.cpp b/src/widgets/widgets/qkeysequenceedit.cpp
index 6f2a6b2d5a..b63b0b4d72 100644
--- a/src/widgets/widgets/qkeysequenceedit.cpp
+++ b/src/widgets/widgets/qkeysequenceedit.cpp
@@ -131,7 +131,7 @@ void QKeySequenceEditPrivate::finishEditing()
     Constructs a QKeySequenceEdit widget with the given \a parent.
 */
 QKeySequenceEdit::QKeySequenceEdit(QWidget *parent)
-    : QKeySequenceEdit(*new QKeySequenceEditPrivate, parent, 0)
+    : QKeySequenceEdit(*new QKeySequenceEditPrivate, parent, { })
 {
 }
 
diff --git a/src/widgets/widgets/qlineedit.cpp b/src/widgets/widgets/qlineedit.cpp
index fb67936768..92f43a309d 100644
--- a/src/widgets/widgets/qlineedit.cpp
+++ b/src/widgets/widgets/qlineedit.cpp
@@ -274,7 +274,7 @@ QLineEdit::QLineEdit(QWidget* parent)
     \sa text(), setMaxLength()
 */
 QLineEdit::QLineEdit(const QString& contents, QWidget* parent)
-    : QWidget(*new QLineEditPrivate, parent, 0)
+    : QWidget(*new QLineEditPrivate, parent, { })
 {
     Q_D(QLineEdit);
     d->init(contents);
diff --git a/src/widgets/widgets/qmainwindowlayout_p.h b/src/widgets/widgets/qmainwindowlayout_p.h
index 967b713096..ebed47da30 100644
--- a/src/widgets/widgets/qmainwindowlayout_p.h
+++ b/src/widgets/widgets/qmainwindowlayout_p.h
@@ -334,7 +334,7 @@ class QDockWidgetGroupWindow : public QWidget
 {
     Q_OBJECT
 public:
-    explicit QDockWidgetGroupWindow(QWidget* parent = nullptr, Qt::WindowFlags f = nullptr)
+    explicit QDockWidgetGroupWindow(QWidget* parent = nullptr, Qt::WindowFlags f = { })
         : QWidget(parent, f) {}
     QDockAreaLayoutInfo *layoutInfo() const;
 #if QT_CONFIG(tabbar)
diff --git a/src/widgets/widgets/qmdisubwindow.cpp b/src/widgets/widgets/qmdisubwindow.cpp
index d58a1d06db..a0286dfcb1 100644
--- a/src/widgets/widgets/qmdisubwindow.cpp
+++ b/src/widgets/widgets/qmdisubwindow.cpp
@@ -2212,7 +2212,7 @@ void QMdiSubWindowPrivate::updateInternalWindowTitle()
     \sa QMdiArea::addSubWindow()
 */
 QMdiSubWindow::QMdiSubWindow(QWidget *parent, Qt::WindowFlags flags)
-    : QWidget(*new QMdiSubWindowPrivate, parent, 0)
+    : QWidget(*new QMdiSubWindowPrivate, parent, { })
 {
     Q_D(QMdiSubWindow);
 #if QT_CONFIG(menu)
diff --git a/src/widgets/widgets/qmenubar.cpp b/src/widgets/widgets/qmenubar.cpp
index 69b1c5896f..afa5ca7142 100644
--- a/src/widgets/widgets/qmenubar.cpp
+++ b/src/widgets/widgets/qmenubar.cpp
@@ -735,7 +735,7 @@ QAction *QMenuBarPrivate::getNextAction(const int _start, const int increment) c
 /*!
     Constructs a menu bar with parent \a parent.
 */
-QMenuBar::QMenuBar(QWidget *parent) : QWidget(*new QMenuBarPrivate, parent, 0)
+QMenuBar::QMenuBar(QWidget *parent) : QWidget(*new QMenuBarPrivate, parent, { })
 {
     Q_D(QMenuBar);
     d->init();
diff --git a/src/widgets/widgets/qprogressbar.cpp b/src/widgets/widgets/qprogressbar.cpp
index 56253b8e44..04241fda09 100644
--- a/src/widgets/widgets/qprogressbar.cpp
+++ b/src/widgets/widgets/qprogressbar.cpp
@@ -234,7 +234,7 @@ bool QProgressBarPrivate::repaintRequired() const
 */
 
 QProgressBar::QProgressBar(QWidget *parent)
-    : QWidget(*(new QProgressBarPrivate), parent, 0)
+    : QWidget(*(new QProgressBarPrivate), parent, { })
 {
     d_func()->init();
 }
diff --git a/src/widgets/widgets/qscrollarea_p.h b/src/widgets/widgets/qscrollarea_p.h
index 2bdf9ed596..26335285a4 100644
--- a/src/widgets/widgets/qscrollarea_p.h
+++ b/src/widgets/widgets/qscrollarea_p.h
@@ -65,7 +65,7 @@ class QScrollAreaPrivate: public QAbstractScrollAreaPrivate
     Q_DECLARE_PUBLIC(QScrollArea)
 
 public:
-    QScrollAreaPrivate(): resizable(false), alignment(nullptr){}
+    QScrollAreaPrivate(): resizable(false) {}
     void updateScrollBars();
     void updateWidgetPosition();
     QPointer<QWidget> widget;
diff --git a/src/widgets/widgets/qsizegrip.cpp b/src/widgets/widgets/qsizegrip.cpp
index 835af9c7b8..662d4c9e92 100644
--- a/src/widgets/widgets/qsizegrip.cpp
+++ b/src/widgets/widgets/qsizegrip.cpp
@@ -195,7 +195,7 @@ Qt::Corner QSizeGripPrivate::corner() const
     parent.
 */
 QSizeGrip::QSizeGrip(QWidget * parent)
-    : QWidget(*new QSizeGripPrivate, parent, 0)
+    : QWidget(*new QSizeGripPrivate, parent, { })
 {
     Q_D(QSizeGrip);
     d->init();
diff --git a/src/widgets/widgets/qsplitter.cpp b/src/widgets/widgets/qsplitter.cpp
index e7a4889996..1a5fb7f251 100644
--- a/src/widgets/widgets/qsplitter.cpp
+++ b/src/widgets/widgets/qsplitter.cpp
@@ -119,7 +119,7 @@ QSplitterPrivate::~QSplitterPrivate()
     \a parent.
 */
 QSplitterHandle::QSplitterHandle(Qt::Orientation orientation, QSplitter *parent)
-    : QWidget(*new QSplitterHandlePrivate, parent, 0)
+    : QWidget(*new QSplitterHandlePrivate, parent, { })
 {
     Q_D(QSplitterHandle);
     d->s = parent;
diff --git a/src/widgets/widgets/qstatusbar.cpp b/src/widgets/widgets/qstatusbar.cpp
index 39f0f11daf..943b576ee3 100644
--- a/src/widgets/widgets/qstatusbar.cpp
+++ b/src/widgets/widgets/qstatusbar.cpp
@@ -226,7 +226,7 @@ QRect QStatusBarPrivate::messageRect() const
     \sa setSizeGripEnabled()
 */
 QStatusBar::QStatusBar(QWidget * parent)
-    : QWidget(*new QStatusBarPrivate, parent, 0)
+    : QWidget(*new QStatusBarPrivate, parent, { })
 {
     Q_D(QStatusBar);
     d->box = 0;
diff --git a/src/widgets/widgets/qtabbar.cpp b/src/widgets/widgets/qtabbar.cpp
index 7e1794efef..dfe362bdca 100644
--- a/src/widgets/widgets/qtabbar.cpp
+++ b/src/widgets/widgets/qtabbar.cpp
@@ -859,7 +859,7 @@ void QTabBarPrivate::refresh()
     Creates a new tab bar with the given \a parent.
 */
 QTabBar::QTabBar(QWidget* parent)
-    :QWidget(*new QTabBarPrivate, parent, 0)
+    :QWidget(*new QTabBarPrivate, parent, { })
 {
     Q_D(QTabBar);
     d->init();
diff --git a/src/widgets/widgets/qtabwidget.cpp b/src/widgets/widgets/qtabwidget.cpp
index 4d7b39ae01..2b3b8280bb 100644
--- a/src/widgets/widgets/qtabwidget.cpp
+++ b/src/widgets/widgets/qtabwidget.cpp
@@ -359,7 +359,7 @@ void QTabWidget::initStyleOption(QStyleOptionTabWidgetFrame *option) const
     Constructs a tabbed widget with parent \a parent.
 */
 QTabWidget::QTabWidget(QWidget *parent)
-    : QWidget(*new QTabWidgetPrivate, parent, 0)
+    : QWidget(*new QTabWidgetPrivate, parent, { })
 {
     Q_D(QTabWidget);
     d->init();
diff --git a/src/widgets/widgets/qtoolbar.cpp b/src/widgets/widgets/qtoolbar.cpp
index 58e9c4fd87..79182dfa33 100644
--- a/src/widgets/widgets/qtoolbar.cpp
+++ b/src/widgets/widgets/qtoolbar.cpp
@@ -503,7 +503,7 @@ void QToolBarPrivate::plug(const QRect &r)
     Constructs a QToolBar with the given \a parent.
 */
 QToolBar::QToolBar(QWidget *parent)
-    : QWidget(*new QToolBarPrivate, parent, 0)
+    : QWidget(*new QToolBarPrivate, parent, { })
 {
     Q_D(QToolBar);
     d->init();
diff --git a/src/widgets/widgets/qwidgettextcontrol_p.h b/src/widgets/widgets/qwidgettextcontrol_p.h
index 59bf5466e6..1f06aa0b97 100644
--- a/src/widgets/widgets/qwidgettextcontrol_p.h
+++ b/src/widgets/widgets/qwidgettextcontrol_p.h
@@ -116,12 +116,12 @@ public:
     void setCurrentCharFormat(const QTextCharFormat &format);
     QTextCharFormat currentCharFormat() const;
 
-    bool find(const QString &exp, QTextDocument::FindFlags options = nullptr);
+    bool find(const QString &exp, QTextDocument::FindFlags options = { });
 #ifndef QT_NO_REGEXP
-    bool find(const QRegExp &exp, QTextDocument::FindFlags options = nullptr);
+    bool find(const QRegExp &exp, QTextDocument::FindFlags options = { });
 #endif
 #if QT_CONFIG(regularexpression)
-    bool find(const QRegularExpression &exp, QTextDocument::FindFlags options = nullptr);
+    bool find(const QRegularExpression &exp, QTextDocument::FindFlags options = { });
 #endif
 
     QString toPlainText() const;