More nullptr usage in headers

Diff generated by running clang-tidy's modernize-use-nullptr checker on
the CMake-based Qt version.

Skipping src/3rdparty, examples/, tests/

Change-Id: Ib182074e2e2fd52f63093f73b3e2e4c0cb7af188
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

42 files changed, 85 insertions, 85 deletions

diff --git a/src/corelib/animation/qabstractanimation_p.h b/src/corelib/animation/qabstractanimation_p.h
index 3b6e8d6cc4..037d3be74f 100644
--- a/src/corelib/animation/qabstractanimation_p.h
+++ b/src/corelib/animation/qabstractanimation_p.h
@@ -78,7 +78,7 @@ public:
           hasRegisteredTimer(false),
           isPause(false),
           isGroup(false),
-          group(0)
+          group(nullptr)
     {
     }
 
diff --git a/src/corelib/animation/qanimationgroup_p.h b/src/corelib/animation/qanimationgroup_p.h
index ff759d11fd..215734b656 100644
--- a/src/corelib/animation/qanimationgroup_p.h
+++ b/src/corelib/animation/qanimationgroup_p.h
@@ -76,7 +76,7 @@ public:
     void disconnectUncontrolledAnimation(QAbstractAnimation *anim)
     {
         //0 for the signal here because we might be called from the animation destructor
-        QObject::disconnect(anim, 0, q_func(), SLOT(_q_uncontrolledAnimationFinished()));
+        QObject::disconnect(anim, nullptr, q_func(), SLOT(_q_uncontrolledAnimationFinished()));
     }
 
     void connectUncontrolledAnimation(QAbstractAnimation *anim)
diff --git a/src/corelib/animation/qpropertyanimation_p.h b/src/corelib/animation/qpropertyanimation_p.h
index 479762f573..cbd3ce287d 100644
--- a/src/corelib/animation/qpropertyanimation_p.h
+++ b/src/corelib/animation/qpropertyanimation_p.h
@@ -64,7 +64,7 @@ class QPropertyAnimationPrivate : public QVariantAnimationPrivate
    Q_DECLARE_PUBLIC(QPropertyAnimation)
 public:
     QPropertyAnimationPrivate()
-        : targetValue(0), propertyType(0), propertyIndex(-1)
+        : targetValue(nullptr), propertyType(0), propertyIndex(-1)
     {
     }
 
diff --git a/src/corelib/animation/qsequentialanimationgroup_p.h b/src/corelib/animation/qsequentialanimationgroup_p.h
index 88dac4f566..c082d6b524 100644
--- a/src/corelib/animation/qsequentialanimationgroup_p.h
+++ b/src/corelib/animation/qsequentialanimationgroup_p.h
@@ -63,7 +63,7 @@ class QSequentialAnimationGroupPrivate : public QAnimationGroupPrivate
     Q_DECLARE_PUBLIC(QSequentialAnimationGroup)
 public:
     QSequentialAnimationGroupPrivate()
-        : currentAnimation(0), currentAnimationIndex(-1), lastLoop(0)
+        : currentAnimation(nullptr), currentAnimationIndex(-1), lastLoop(0)
     { }
 
 
diff --git a/src/corelib/codecs/qtextcodec_p.h b/src/corelib/codecs/qtextcodec_p.h
index 0e449d994c..7fcf6df984 100644
--- a/src/corelib/codecs/qtextcodec_p.h
+++ b/src/corelib/codecs/qtextcodec_p.h
@@ -98,7 +98,7 @@ public:
 
     struct ConverterState {
         ConverterState(ConversionFlags f = DefaultConversion)
-            : flags(f), remainingChars(0), invalidChars(0), d(0) { state_data[0] = state_data[1] = state_data[2] = 0; }
+            : flags(f), remainingChars(0), invalidChars(0), d(nullptr) { state_data[0] = state_data[1] = state_data[2] = 0; }
         ~ConverterState() { }
         ConversionFlags flags;
         int remainingChars;
diff --git a/src/corelib/global/qglobalstatic.h b/src/corelib/global/qglobalstatic.h
index 555bdf04c1..93d71cee57 100644
--- a/src/corelib/global/qglobalstatic.h
+++ b/src/corelib/global/qglobalstatic.h
@@ -131,8 +131,8 @@ struct QGlobalStatic
 
     bool isDestroyed() const { return guard.load() <= QtGlobalStatic::Destroyed; }
     bool exists() const { return guard.load() == QtGlobalStatic::Initialized; }
-    operator Type *() { if (isDestroyed()) return 0; return innerFunction(); }
-    Type *operator()() { if (isDestroyed()) return 0; return innerFunction(); }
+    operator Type *() { if (isDestroyed()) return nullptr; return innerFunction(); }
+    Type *operator()() { if (isDestroyed()) return nullptr; return innerFunction(); }
     Type *operator->()
     {
       Q_ASSERT_X(!isDestroyed(), "Q_GLOBAL_STATIC", "The global static was used after being destroyed");
diff --git a/src/corelib/io/qabstractfileengine_p.h b/src/corelib/io/qabstractfileengine_p.h
index 4a7fe7bff5..c88b66c7ce 100644
--- a/src/corelib/io/qabstractfileengine_p.h
+++ b/src/corelib/io/qabstractfileengine_p.h
@@ -193,7 +193,7 @@ public:
         uchar *address;
     };
 
-    virtual bool extension(Extension extension, const ExtensionOption *option = 0, ExtensionReturn *output = 0);
+    virtual bool extension(Extension extension, const ExtensionOption *option = nullptr, ExtensionReturn *output = nullptr);
     virtual bool supportsExtension(Extension extension) const;
 
     // Factory
diff --git a/src/corelib/io/qfileinfo_p.h b/src/corelib/io/qfileinfo_p.h
index e4b28f4519..36f440812f 100644
--- a/src/corelib/io/qfileinfo_p.h
+++ b/src/corelib/io/qfileinfo_p.h
@@ -80,7 +80,7 @@ public:
     };
 
     inline QFileInfoPrivate()
-        : QSharedData(), fileEngine(0),
+        : QSharedData(), fileEngine(nullptr),
         cachedFlags(0),
         isDefaultConstructed(true),
         cache_enabled(true), fileFlags(0), fileSize(0)
diff --git a/src/corelib/io/qfilesystemengine_p.h b/src/corelib/io/qfilesystemengine_p.h
index 09ec2d6a10..e44837747c 100644
--- a/src/corelib/io/qfilesystemengine_p.h
+++ b/src/corelib/io/qfilesystemengine_p.h
@@ -130,7 +130,7 @@ public:
     static bool removeFile(const QFileSystemEntry &entry, QSystemError &error);
 
     static bool setPermissions(const QFileSystemEntry &entry, QFile::Permissions permissions, QSystemError &error,
-                               QFileSystemMetaData *data = 0);
+                               QFileSystemMetaData *data = nullptr);
 
     // unused, therefore not implemented
     static bool setFileTime(const QFileSystemEntry &entry, const QDateTime &newDate,
diff --git a/src/corelib/io/qfilesystemmetadata_p.h b/src/corelib/io/qfilesystemmetadata_p.h
index 4d2a5acb9b..81f4b3ba13 100644
--- a/src/corelib/io/qfilesystemmetadata_p.h
+++ b/src/corelib/io/qfilesystemmetadata_p.h
@@ -76,7 +76,7 @@ class Q_AUTOTEST_EXPORT QFileSystemMetaData
 {
 public:
     QFileSystemMetaData()
-        : knownFlagsMask(0),
+        : knownFlagsMask(nullptr),
           size_(-1)
     {
     }
@@ -184,7 +184,7 @@ public:
 
     void clear()
     {
-        knownFlagsMask = 0;
+        knownFlagsMask = nullptr;
     }
 
     void clearFlags(MetaDataFlags flags = AllMetaDataFlags)
diff --git a/src/corelib/io/qfsfileengine_p.h b/src/corelib/io/qfsfileengine_p.h
index 6b091a8eef..0f416f4886 100644
--- a/src/corelib/io/qfsfileengine_p.h
+++ b/src/corelib/io/qfsfileengine_p.h
@@ -115,7 +115,7 @@ public:
     virtual bool isUnnamedFile() const
     { return false; }
 
-    bool extension(Extension extension, const ExtensionOption *option = 0, ExtensionReturn *output = 0) override;
+    bool extension(Extension extension, const ExtensionOption *option = nullptr, ExtensionReturn *output = nullptr) override;
     bool supportsExtension(Extension extension) const override;
 
     //FS only!!
diff --git a/src/corelib/io/qprocess_p.h b/src/corelib/io/qprocess_p.h
index aa7ecbe91d..1bc63240fe 100644
--- a/src/corelib/io/qprocess_p.h
+++ b/src/corelib/io/qprocess_p.h
@@ -247,7 +247,7 @@ public:
             // if you add "= 4" here, increase the number of bits below
         };
 
-        Channel() : process(0), notifier(0), type(Normal), closed(false), append(false)
+        Channel() : process(nullptr), notifier(nullptr), type(Normal), closed(false), append(false)
         {
             pipe[0] = INVALID_Q_PIPE;
             pipe[1] = INVALID_Q_PIPE;
diff --git a/src/corelib/io/qresource_p.h b/src/corelib/io/qresource_p.h
index 7451de8809..fedf95bb33 100644
--- a/src/corelib/io/qresource_p.h
+++ b/src/corelib/io/qresource_p.h
@@ -108,7 +108,7 @@ public:
     Iterator *beginEntryList(QDir::Filters filters, const QStringList &filterNames) override;
     Iterator *endEntryList() override;
 
-    bool extension(Extension extension, const ExtensionOption *option = 0, ExtensionReturn *output = 0) override;
+    bool extension(Extension extension, const ExtensionOption *option = nullptr, ExtensionReturn *output = nullptr) override;
     bool supportsExtension(Extension extension) const override;
 };
 
diff --git a/src/corelib/io/qurl_p.h b/src/corelib/io/qurl_p.h
index 1b9237e58a..e75de32e03 100644
--- a/src/corelib/io/qurl_p.h
+++ b/src/corelib/io/qurl_p.h
@@ -59,7 +59,7 @@ QT_BEGIN_NAMESPACE
 
 // in qurlrecode.cpp
 extern Q_AUTOTEST_EXPORT int qt_urlRecode(QString &appendTo, const QChar *begin, const QChar *end,
-                                          QUrl::ComponentFormattingOptions encoding, const ushort *tableModifications = 0);
+                                          QUrl::ComponentFormattingOptions encoding, const ushort *tableModifications = nullptr);
 
 // in qurlidna.cpp
 enum AceLeadingDot { AllowLeadingDot, ForbidLeadingDot };
diff --git a/src/corelib/itemmodels/qabstractitemmodel_p.h b/src/corelib/itemmodels/qabstractitemmodel_p.h
index e6085eca94..92a440a125 100644
--- a/src/corelib/itemmodels/qabstractitemmodel_p.h
+++ b/src/corelib/itemmodels/qabstractitemmodel_p.h
@@ -98,7 +98,7 @@ public:
     void itemsMoved(const QModelIndex &srcParent, int srcFirst, int srcLast, const QModelIndex &destinationParent, int destinationChild, Qt::Orientation orientation);
     bool allowMove(const QModelIndex &srcParent, int srcFirst, int srcLast, const QModelIndex &destinationParent, int destinationChild, Qt::Orientation orientation);
 
-    inline QModelIndex createIndex(int row, int column, void *data = 0) const {
+    inline QModelIndex createIndex(int row, int column, void *data = nullptr) const {
         return q_func()->createIndex(row, column, data);
     }
 
diff --git a/src/corelib/itemmodels/qabstractproxymodel_p.h b/src/corelib/itemmodels/qabstractproxymodel_p.h
index f7bd5cc691..a95687c970 100644
--- a/src/corelib/itemmodels/qabstractproxymodel_p.h
+++ b/src/corelib/itemmodels/qabstractproxymodel_p.h
@@ -62,7 +62,7 @@ class Q_CORE_EXPORT QAbstractProxyModelPrivate : public QAbstractItemModelPrivat
 {
     Q_DECLARE_PUBLIC(QAbstractProxyModel)
 public:
-    QAbstractProxyModelPrivate() : QAbstractItemModelPrivate(), model(0) {}
+    QAbstractProxyModelPrivate() : QAbstractItemModelPrivate(), model(nullptr) {}
     QAbstractItemModel *model;
     virtual void _q_sourceModelDestroyed();
     void mapDropCoordinatesToSource(int row, int column, const QModelIndex &parent,
diff --git a/src/corelib/itemmodels/qitemselectionmodel_p.h b/src/corelib/itemmodels/qitemselectionmodel_p.h
index e12a0c2928..ba85f22be3 100644
--- a/src/corelib/itemmodels/qitemselectionmodel_p.h
+++ b/src/corelib/itemmodels/qitemselectionmodel_p.h
@@ -62,7 +62,7 @@ class QItemSelectionModelPrivate: public QObjectPrivate
     Q_DECLARE_PUBLIC(QItemSelectionModel)
 public:
     QItemSelectionModelPrivate()
-      : model(0),
+      : model(nullptr),
         currentCommand(QItemSelectionModel::NoUpdate),
         tableSelected(false), tableColCount(0), tableRowCount(0) {}
 
diff --git a/src/corelib/kernel/qcore_unix_p.h b/src/corelib/kernel/qcore_unix_p.h
index 5a2a29a327..32ef6408c2 100644
--- a/src/corelib/kernel/qcore_unix_p.h
+++ b/src/corelib/kernel/qcore_unix_p.h
@@ -171,7 +171,7 @@ inline void qt_ignore_sigpipe()
         struct sigaction noaction;
         memset(&noaction, 0, sizeof(noaction));
         noaction.sa_handler = SIG_IGN;
-        ::sigaction(SIGPIPE, &noaction, 0);
+        ::sigaction(SIGPIPE, &noaction, nullptr);
         atom.store(1);
     }
 }
diff --git a/src/corelib/kernel/qcoreapplication_p.h b/src/corelib/kernel/qcoreapplication_p.h
index b3479414ab..14ca3efd7f 100644
--- a/src/corelib/kernel/qcoreapplication_p.h
+++ b/src/corelib/kernel/qcoreapplication_p.h
@@ -149,7 +149,7 @@ public:
     QString cachedApplicationDirPath;
     static QString *cachedApplicationFilePath;
     static void setApplicationFilePath(const QString &path);
-    static inline void clearApplicationFilePath() { delete cachedApplicationFilePath; cachedApplicationFilePath = 0; }
+    static inline void clearApplicationFilePath() { delete cachedApplicationFilePath; cachedApplicationFilePath = nullptr; }
 
 #ifndef QT_NO_QOBJECT
     void execCleanup();
diff --git a/src/corelib/kernel/qeventdispatcher_glib_p.h b/src/corelib/kernel/qeventdispatcher_glib_p.h
index 88ff316ee5..313825d0a7 100644
--- a/src/corelib/kernel/qeventdispatcher_glib_p.h
+++ b/src/corelib/kernel/qeventdispatcher_glib_p.h
@@ -66,8 +66,8 @@ class Q_CORE_EXPORT QEventDispatcherGlib : public QAbstractEventDispatcher
     Q_DECLARE_PRIVATE(QEventDispatcherGlib)
 
 public:
-    explicit QEventDispatcherGlib(QObject *parent = 0);
-    explicit QEventDispatcherGlib(GMainContext *context, QObject *parent = 0);
+    explicit QEventDispatcherGlib(QObject *parent = nullptr);
+    explicit QEventDispatcherGlib(GMainContext *context, QObject *parent = nullptr);
     ~QEventDispatcherGlib();
 
     bool processEvents(QEventLoop::ProcessEventsFlags flags) override;
@@ -102,7 +102,7 @@ class Q_CORE_EXPORT QEventDispatcherGlibPrivate : public QAbstractEventDispatche
 {
 
 public:
-    QEventDispatcherGlibPrivate(GMainContext *context = 0);
+    QEventDispatcherGlibPrivate(GMainContext *context = nullptr);
     GMainContext *mainContext;
     GPostEventSource *postEventSource;
     GSocketNotifierSource *socketNotifierSource;
diff --git a/src/corelib/kernel/qeventdispatcher_unix_p.h b/src/corelib/kernel/qeventdispatcher_unix_p.h
index 0fd068b074..8cfa4bbdf7 100644
--- a/src/corelib/kernel/qeventdispatcher_unix_p.h
+++ b/src/corelib/kernel/qeventdispatcher_unix_p.h
@@ -102,7 +102,7 @@ class Q_CORE_EXPORT QEventDispatcherUNIX : public QAbstractEventDispatcher
     Q_DECLARE_PRIVATE(QEventDispatcherUNIX)
 
 public:
-    explicit QEventDispatcherUNIX(QObject *parent = 0);
+    explicit QEventDispatcherUNIX(QObject *parent = nullptr);
     ~QEventDispatcherUNIX();
 
     bool processEvents(QEventLoop::ProcessEventsFlags flags) override;
@@ -123,7 +123,7 @@ public:
     void flush() override;
 
 protected:
-    QEventDispatcherUNIX(QEventDispatcherUNIXPrivate &dd, QObject *parent = 0);
+    QEventDispatcherUNIX(QEventDispatcherUNIXPrivate &dd, QObject *parent = nullptr);
 };
 
 class Q_CORE_EXPORT QEventDispatcherUNIXPrivate : public QAbstractEventDispatcherPrivate
@@ -152,9 +152,9 @@ public:
 
 inline QSocketNotifierSetUNIX::QSocketNotifierSetUNIX() Q_DECL_NOTHROW
 {
-    notifiers[0] = 0;
-    notifiers[1] = 0;
-    notifiers[2] = 0;
+    notifiers[0] = nullptr;
+    notifiers[1] = nullptr;
+    notifiers[2] = nullptr;
 }
 
 inline bool QSocketNotifierSetUNIX::isEmpty() const Q_DECL_NOTHROW
diff --git a/src/corelib/kernel/qmetaobject_moc_p.h b/src/corelib/kernel/qmetaobject_moc_p.h
index ad258acfcd..8c7900767b 100644
--- a/src/corelib/kernel/qmetaobject_moc_p.h
+++ b/src/corelib/kernel/qmetaobject_moc_p.h
@@ -138,7 +138,7 @@ static QByteArray normalizeTypeInternal(const char *t, const char *e, bool fixSc
             { "struct ", 7 },
             { "class ", 6 },
             { "enum ", 5 },
-            { 0, 0 }
+            { nullptr, 0 }
         };
         int i = 0;
         do {
@@ -146,7 +146,7 @@ static QByteArray normalizeTypeInternal(const char *t, const char *e, bool fixSc
                 t += optional[i].len;
                 break;
             }
-        } while (optional[++i].keyword != 0);
+        } while (optional[++i].keyword != nullptr);
     }
 
     bool star = false;
diff --git a/src/corelib/kernel/qmetaobject_p.h b/src/corelib/kernel/qmetaobject_p.h
index 5b412b5140..26d86fdf14 100644
--- a/src/corelib/kernel/qmetaobject_p.h
+++ b/src/corelib/kernel/qmetaobject_p.h
@@ -226,8 +226,8 @@ struct QMetaObjectPrivate
     static QObjectPrivate::Connection *connect(const QObject *sender, int signal_index,
                         const QMetaObject *smeta,
                         const QObject *receiver, int method_index_relative,
-                        const QMetaObject *rmeta = 0,
-                        int type = 0, int *types = 0);
+                        const QMetaObject *rmeta = nullptr,
+                        int type = 0, int *types = nullptr);
     static bool disconnect(const QObject *sender, int signal_index,
                            const QMetaObject *smeta,
                            const QObject *receiver, int method_index, void **slot,
diff --git a/src/corelib/kernel/qmetaobjectbuilder_p.h b/src/corelib/kernel/qmetaobjectbuilder_p.h
index 6100835bad..6d43be7811 100644
--- a/src/corelib/kernel/qmetaobjectbuilder_p.h
+++ b/src/corelib/kernel/qmetaobjectbuilder_p.h
@@ -173,7 +173,7 @@ public:
     void setStaticMetacallFunction(QMetaObjectBuilder::StaticMetacallFunction value);
 
     QMetaObject *toMetaObject() const;
-    QByteArray toRelocatableData(bool * = 0) const;
+    QByteArray toRelocatableData(bool * = nullptr) const;
     static void fromRelocatableData(QMetaObject *, const QMetaObject *, const QByteArray &);
 
 #ifndef QT_NO_DATASTREAM
@@ -196,7 +196,7 @@ private:
 class Q_CORE_EXPORT QMetaMethodBuilder
 {
 public:
-    QMetaMethodBuilder() : _mobj(0), _index(0) {}
+    QMetaMethodBuilder() : _mobj(nullptr), _index(0) {}
 
     int index() const;
 
@@ -238,7 +238,7 @@ private:
 class Q_CORE_EXPORT QMetaPropertyBuilder
 {
 public:
-    QMetaPropertyBuilder() : _mobj(0), _index(0) {}
+    QMetaPropertyBuilder() : _mobj(nullptr), _index(0) {}
 
     int index() const { return _index; }
 
@@ -294,7 +294,7 @@ private:
 class Q_CORE_EXPORT QMetaEnumBuilder
 {
 public:
-    QMetaEnumBuilder() : _mobj(0), _index(0) {}
+    QMetaEnumBuilder() : _mobj(nullptr), _index(0) {}
 
     int index() const { return _index; }
 
diff --git a/src/corelib/kernel/qsharedmemory_p.h b/src/corelib/kernel/qsharedmemory_p.h
index 95fe0d1083..59802eb6ce 100644
--- a/src/corelib/kernel/qsharedmemory_p.h
+++ b/src/corelib/kernel/qsharedmemory_p.h
@@ -98,7 +98,7 @@ public:
     {
         if (q_sm && q_sm->lock())
             return true;
-        q_sm = 0;
+        q_sm = nullptr;
         return false;
     }
 
diff --git a/src/corelib/kernel/qvariant_p.h b/src/corelib/kernel/qvariant_p.h
index b22b7c231e..3d87beac83 100644
--- a/src/corelib/kernel/qvariant_p.h
+++ b/src/corelib/kernel/qvariant_p.h
@@ -88,7 +88,7 @@ inline T *v_cast(const QVariant::Private *nd, T * = 0)
 #else // every other compiler in this world
 
 template <typename T>
-inline const T *v_cast(const QVariant::Private *d, T * = 0)
+inline const T *v_cast(const QVariant::Private *d, T * = nullptr)
 {
     return !QVariantIntegrator<T>::CanUseInternalSpace
             ? static_cast<const T *>(d->data.shared->ptr)
@@ -96,7 +96,7 @@ inline const T *v_cast(const QVariant::Private *d, T * = 0)
 }
 
 template <typename T>
-inline T *v_cast(QVariant::Private *d, T * = 0)
+inline T *v_cast(QVariant::Private *d, T * = nullptr)
 {
     return !QVariantIntegrator<T>::CanUseInternalSpace
             ? static_cast<T *>(d->data.shared->ptr)
@@ -154,7 +154,7 @@ inline void v_construct(QVariant::Private *x, const T &t)
 
 // constructs a new variant if copy is 0, otherwise copy-constructs
 template <class T>
-inline void v_construct(QVariant::Private *x, const void *copy, T * = 0)
+inline void v_construct(QVariant::Private *x, const void *copy, T * = nullptr)
 {
     if (copy)
         v_construct<T>(x, *static_cast<const T *>(copy));
@@ -164,7 +164,7 @@ inline void v_construct(QVariant::Private *x, const void *copy, T * = 0)
 
 // deletes the internal structures
 template <class T>
-inline void v_clear(QVariant::Private *d, T* = 0)
+inline void v_clear(QVariant::Private *d, T* = nullptr)
 {
 
     if (!QVariantIntegrator<T>::CanUseInternalSpace) {
@@ -264,7 +264,7 @@ class QVariantIsNull
         struct No { char unused[2]; };
         Q_STATIC_ASSERT(sizeof(Yes) != sizeof(No));
 
-        template<class C> static decltype(static_cast<const C*>(0)->isNull(), Yes()) test(int);
+        template<class C> static decltype(static_cast<const C*>(nullptr)->isNull(), Yes()) test(int);
         template<class C> static No test(...);
     public:
         static const bool Value = (sizeof(test<T>(0)) == sizeof(Yes));
diff --git a/src/corelib/plugin/qlibrary_p.h b/src/corelib/plugin/qlibrary_p.h
index 3f650501c8..1a216c98b5 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 = 0);
+                                         QLibrary::LoadHints loadHints = nullptr);
     static QStringList suffixes_sys(const QString &fullVersion);
     static QStringList prefixes_sys();
 
diff --git a/src/corelib/serialization/qjson_p.h b/src/corelib/serialization/qjson_p.h
index 40b2414e4a..a9e7059cbe 100644
--- a/src/corelib/serialization/qjson_p.h
+++ b/src/corelib/serialization/qjson_p.h
@@ -686,7 +686,7 @@ public:
     {
     }
     inline Data(int reserved, QJsonValue::Type valueType)
-        : rawData(0), compactionCounter(0), ownsData(true)
+        : rawData(nullptr), compactionCounter(0), ownsData(true)
     {
         Q_ASSERT(valueType == QJsonValue::Array || valueType == QJsonValue::Object);
 
@@ -728,7 +728,7 @@ public:
             size = qMax(size + reserve, qMin(size *2, (int)Value::MaxSize));
             if (size > Value::MaxSize) {
                 qWarning("QJson: Document too large to store in data structure");
-                return 0;
+                return nullptr;
             }
         }
         char *raw = (char *)malloc(size);
diff --git a/src/corelib/serialization/qxmlstream_p.h b/src/corelib/serialization/qxmlstream_p.h
index 61f501f81b..cde66a48a3 100644
--- a/src/corelib/serialization/qxmlstream_p.h
+++ b/src/corelib/serialization/qxmlstream_p.h
@@ -162,12 +162,12 @@ public:
 
 
 const char *const QXmlStreamReader_Table::spell [] = {
-  "end of file", 0, " ", "<", ">", "&", "#", "\'", "\"", "[", 
+  "end of file", nullptr, " ", "<", ">", "&", "#", "\'", "\"", "[",
   "]", "(", ")", "|", "=", "%", "/", ":", ";", ",", 
   "-", "+", "*", ".", "?", "!", "[a-zA-Z]", "[0-9]", "[CDATA[", "DOCTYPE", 
   "ELEMENT", "ATTLIST", "ENTITY", "NOTATION", "SYSTEM", "PUBLIC", "NDATA", "REQUIRED", "IMPLIED", "FIXED", 
-  "EMPTY", "ANY", "PCDATA", 0, 0, 0, 0, "CDATA", "ID", "IDREF", 
-  "IDREFS", "ENTITIES", "NMTOKEN", "NMTOKENS", "<?xml", "version", 0};
+  "EMPTY", "ANY", "PCDATA", nullptr, nullptr, nullptr, nullptr, "CDATA", "ID", "IDREF",
+  "IDREFS", "ENTITIES", "NMTOKEN", "NMTOKENS", "<?xml", "version", nullptr};
 
 const short QXmlStreamReader_Table::lhs [] = {
   57, 57, 59, 59, 59, 59, 59, 59, 59, 59, 
@@ -645,7 +645,7 @@ template <typename T> class QXmlStreamSimpleStack {
     T *data;
     int tos, cap;
 public:
-    inline QXmlStreamSimpleStack():data(0), tos(-1), cap(0){}
+    inline QXmlStreamSimpleStack():data(nullptr), tos(-1), cap(0){}
     inline ~QXmlStreamSimpleStack(){ if (data) free(data); }
 
     inline void reserve(int extraCapacity) {
@@ -995,7 +995,7 @@ public:
     int fastScanLiteralContent();
     int fastScanSpace();
     int fastScanContentCharList();
-    int fastScanName(int *prefix = 0);
+    int fastScanName(int *prefix = nullptr);
     inline int fastScanNMTOKEN();
 
 
diff --git a/src/corelib/statemachine/qstate_p.h b/src/corelib/statemachine/qstate_p.h
index 7fb40392e7..ec746caae1 100644
--- a/src/corelib/statemachine/qstate_p.h
+++ b/src/corelib/statemachine/qstate_p.h
@@ -68,14 +68,14 @@ QT_BEGIN_NAMESPACE
 struct QPropertyAssignment
 {
     QPropertyAssignment()
-        : object(0), explicitlySet(true) {}
+        : object(nullptr), explicitlySet(true) {}
     QPropertyAssignment(QObject *o, const QByteArray &n,
                         const QVariant &v, bool es = true)
         : object(o), propertyName(n), value(v), explicitlySet(es)
         {}
 
     bool objectDeleted() const { return !object; }
-    void write() const { Q_ASSERT(object != 0); object->setProperty(propertyName, value); }
+    void write() const { Q_ASSERT(object != nullptr); object->setProperty(propertyName, value); }
     bool hasTarget(QObject *o, const QByteArray &pn) const
     { return object == o && propertyName == pn; }
 
@@ -99,8 +99,8 @@ public:
     QStatePrivate();
     ~QStatePrivate();
 
-    static QStatePrivate *get(QState *q) { return q ? q->d_func() : 0; }
-    static const QStatePrivate *get(const QState *q) { return q? q->d_func() : 0; }
+    static QStatePrivate *get(QState *q) { return q ? q->d_func() : nullptr; }
+    static const QStatePrivate *get(const QState *q) { return q? q->d_func() : nullptr; }
 
     QList<QAbstractState*> childStates() const;
     QList<QHistoryState*> historyStates() const;
diff --git a/src/corelib/statemachine/qstatemachine_p.h b/src/corelib/statemachine/qstatemachine_p.h
index f3366ca5f7..c66130b8ce 100644
--- a/src/corelib/statemachine/qstatemachine_p.h
+++ b/src/corelib/statemachine/qstatemachine_p.h
@@ -108,7 +108,7 @@ public:
     ~QStateMachinePrivate();
 
     static QStateMachinePrivate *get(QStateMachine *q)
-    { return q ? q->d_func() : 0; }
+    { return q ? q->d_func() : nullptr; }
 
     QState *findLCA(const QList<QAbstractState*> &states, bool onlyCompound = false) const;
     QState *findLCCA(const QList<QAbstractState*> &states) const;
@@ -313,7 +313,7 @@ public:
         DelayedEvent(QEvent *e, int tid)
             : event(e), timerId(tid) {}
         DelayedEvent()
-            : event(0), timerId(0) {}
+            : event(nullptr), timerId(0) {}
     };
     QHash<int, DelayedEvent> delayedEvents;
     QHash<int, int> timerIdToDelayedEventId;
diff --git a/src/corelib/thread/qatomic_bootstrap.h b/src/corelib/thread/qatomic_bootstrap.h
index b463f817bd..27a67fb2ee 100644
--- a/src/corelib/thread/qatomic_bootstrap.h
+++ b/src/corelib/thread/qatomic_bootstrap.h
@@ -65,7 +65,7 @@ template <typename T> struct QAtomicOps: QGenericAtomicOps<QAtomicOps<T> >
         return --_q_value != 0;
     }
 
-    static bool testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue = 0) Q_DECL_NOTHROW
+    static bool testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue = nullptr) Q_DECL_NOTHROW
     {
         if (currentValue)
             *currentValue = _q_value;
diff --git a/src/corelib/thread/qresultstore.h b/src/corelib/thread/qresultstore.h
index 1f29e8d187..7a65089396 100644
--- a/src/corelib/thread/qresultstore.h
+++ b/src/corelib/thread/qresultstore.h
@@ -142,7 +142,7 @@ public:
     template <typename T>
     int addResult(int index, const T *result)
     {
-        if (result == 0)
+        if (result == nullptr)
             return addResult(index, static_cast<void *>(nullptr));
         else
             return addResult(index, static_cast<void *>(new T(*result)));
@@ -158,7 +158,7 @@ public:
     int addResults(int index, const QVector<T> *results, int totalCount)
     {
         if (m_filterMode == true && results->count() != totalCount && 0 == results->count())
-            return addResults(index, 0, 0, totalCount);
+            return addResults(index, nullptr, 0, totalCount);
         else
             return addResults(index, new QVector<T>(*results), results->count(), totalCount);
     }
diff --git a/src/corelib/thread/qthread_p.h b/src/corelib/thread/qthread_p.h
index 7d9442ab79..e614ddd004 100644
--- a/src/corelib/thread/qthread_p.h
+++ b/src/corelib/thread/qthread_p.h
@@ -89,7 +89,7 @@ public:
     QEvent *event;
     int priority;
     inline QPostEvent()
-        : receiver(0), event(0), priority(0)
+        : receiver(nullptr), event(nullptr), priority(0)
     { }
     inline QPostEvent(QObject *r, QEvent *e, int p)
         : receiver(r), event(e), priority(p)
@@ -148,7 +148,7 @@ private:
 class Q_CORE_EXPORT QDaemonThread : public QThread
 {
 public:
-    QDaemonThread(QObject *parent = 0);
+    QDaemonThread(QObject *parent = nullptr);
     ~QDaemonThread();
 };
 
@@ -157,7 +157,7 @@ class QThreadPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QThread)
 
 public:
-    QThreadPrivate(QThreadData *d = 0);
+    QThreadPrivate(QThreadData *d = nullptr);
     ~QThreadPrivate();
 
     void setPriority(QThread::Priority prio);
@@ -248,7 +248,7 @@ public:
 #endif
     static void clearCurrentThreadData();
     static QThreadData *get2(QThread *thread)
-    { Q_ASSERT_X(thread != 0, "QThread", "internal error"); return thread->d_func()->data; }
+    { Q_ASSERT_X(thread != nullptr, "QThread", "internal error"); return thread->d_func()->data; }
 
 
     void ref();
@@ -281,7 +281,7 @@ public:
 
     public:
         FlaggedDebugSignatures() : idx(0)
-        { std::fill_n(locations, Count, static_cast<char*>(0)); }
+        { std::fill_n(locations, Count, static_cast<char*>(nullptr)); }
 
         void store(const char* method)
         { locations[idx++ % Count] = method; }
@@ -328,7 +328,7 @@ class QAdoptedThread : public QThread
     Q_DECLARE_PRIVATE(QThread)
 
 public:
-    QAdoptedThread(QThreadData *data = 0);
+    QAdoptedThread(QThreadData *data = nullptr);
     ~QAdoptedThread();
     void init();
 
diff --git a/src/corelib/thread/qthreadpool_p.h b/src/corelib/thread/qthreadpool_p.h
index 952e02ef20..01852d8366 100644
--- a/src/corelib/thread/qthreadpool_p.h
+++ b/src/corelib/thread/qthreadpool_p.h
@@ -162,7 +162,7 @@ public:
     void tryToStartMoreThreads();
     bool tooManyThreadsActive() const;
 
-    void startThread(QRunnable *runnable = 0);
+    void startThread(QRunnable *runnable = nullptr);
     void reset();
     bool waitForDone(int msecs);
     bool waitForDone(const QDeadlineTimer &timer);
diff --git a/src/corelib/thread/qthreadstorage.h b/src/corelib/thread/qthreadstorage.h
index 55fc482da3..9eb8672e92 100644
--- a/src/corelib/thread/qthreadstorage.h
+++ b/src/corelib/thread/qthreadstorage.h
@@ -69,7 +69,7 @@ inline
 T *&qThreadStorage_localData(QThreadStorageData &d, T **)
 {
     void **v = d.get();
-    if (!v) v = d.set(0);
+    if (!v) v = d.set(nullptr);
     return *(reinterpret_cast<T**>(v));
 }
 
@@ -139,7 +139,7 @@ public:
     inline ~QThreadStorage() { }
 
     inline bool hasLocalData() const
-    { return d.get() != 0; }
+    { return d.get() != nullptr; }
 
     inline T& localData()
     { return qThreadStorage_localData(d, reinterpret_cast<T*>(0)); }
diff --git a/src/corelib/tools/qcache.h b/src/corelib/tools/qcache.h
index 8c0e7860f7..b558a8358d 100644
--- a/src/corelib/tools/qcache.h
+++ b/src/corelib/tools/qcache.h
@@ -51,7 +51,7 @@ class QCache
     struct Node {
         inline Node() : keyPtr(0) {}
         inline Node(T *data, int cost)
-            : keyPtr(0), t(data), c(cost), p(0), n(0) {}
+            : keyPtr(nullptr), t(data), c(cost), p(nullptr), n(nullptr) {}
         const Key *keyPtr; T *t; int c; Node *p,*n;
     };
     Node *f, *l;
@@ -71,14 +71,14 @@ class QCache
     inline T *relink(const Key &key) {
         typename QHash<Key, Node>::iterator i = hash.find(key);
         if (typename QHash<Key, Node>::const_iterator(i) == hash.constEnd())
-            return 0;
+            return nullptr;
 
         Node &n = *i;
         if (f != &n) {
             if (n.p) n.p->n = n.n;
             if (n.n) n.n->p = n.p;
             if (l == &n) l = n.p;
-            n.p = 0;
+            n.p = nullptr;
             n.n = f;
             f->p = &n;
             f = &n;
@@ -117,12 +117,12 @@ private:
 
 template <class Key, class T>
 inline QCache<Key, T>::QCache(int amaxCost) Q_DECL_NOTHROW
-    : f(0), l(0), mx(amaxCost), total(0) {}
+    : f(nullptr), l(nullptr), mx(amaxCost), total(0) {}
 
 template <class Key, class T>
 inline void QCache<Key,T>::clear()
 { while (f) { delete f->t; f = f->n; }
- hash.clear(); l = 0; total = 0; }
+ hash.clear(); l = nullptr; total = 0; }
 
 template <class Key, class T>
 inline void QCache<Key,T>::setMaxCost(int m)
@@ -153,11 +153,11 @@ inline T *QCache<Key,T>::take(const Key &key)
 {
     typename QHash<Key, Node>::iterator i = hash.find(key);
     if (i == hash.end())
-        return 0;
+        return nullptr;
 
     Node &n = *i;
     T *t = n.t;
-    n.t = 0;
+    n.t = nullptr;
     unlink(n);
     return t;
 }
diff --git a/src/corelib/tools/qdatetime_p.h b/src/corelib/tools/qdatetime_p.h
index 4d30d4192b..6e4120d762 100644
--- a/src/corelib/tools/qdatetime_p.h
+++ b/src/corelib/tools/qdatetime_p.h
@@ -135,7 +135,7 @@ public:
 #if QT_CONFIG(timezone)
     static qint64 zoneMSecsToEpochMSecs(qint64 msecs, const QTimeZone &zone,
                                         DaylightStatus hint = UnknownDaylightTime,
-                                        QDate *localDate = 0, QTime *localTime = 0);
+                                        QDate *localDate = nullptr, QTime *localTime = nullptr);
 
     // Inlined for its one caller in qdatetime.cpp
     inline void setUtcOffsetByTZ(qint64 atMSecsSinceEpoch);
diff --git a/src/corelib/tools/qdatetimeparser_p.h b/src/corelib/tools/qdatetimeparser_p.h
index f7e6e351fe..e244fed09a 100644
--- a/src/corelib/tools/qdatetimeparser_p.h
+++ b/src/corelib/tools/qdatetimeparser_p.h
@@ -86,7 +86,7 @@ public:
         DateTimeEdit
     };
     QDateTimeParser(QVariant::Type t, Context ctx)
-        : currentSectionIndex(-1), display(0), cachedDay(-1), parserType(t),
+        : currentSectionIndex(-1), display(nullptr), cachedDay(-1), parserType(t),
         fixday(false), spec(Qt::LocalTime), context(ctx)
     {
         defaultLocale = QLocale::system();
@@ -218,9 +218,9 @@ private:
     ParsedSection parseSection(const QDateTime &currentValue, int sectionIndex,
                                int offset, QString *text) const;
     int findMonth(const QString &str1, int monthstart, int sectionIndex,
-                  QString *monthName = 0, int *used = 0) const;
+                  QString *monthName = nullptr, int *used = nullptr) const;
     int findDay(const QString &str1, int intDaystart, int sectionIndex,
-                QString *dayName = 0, int *used = 0) const;
+                QString *dayName = nullptr, int *used = nullptr) const;
     ParsedSection findTimeZone(QStringRef str, const QDateTime &when,
                                int maxVal, int minVal) const;
 #if QT_CONFIG(timezone)
@@ -236,7 +236,7 @@ private:
         PossiblePM = 3,
         PossibleBoth = 4
     };
-    AmPmFinder findAmPm(QString &str, int index, int *used = 0) const;
+    AmPmFinder findAmPm(QString &str, int index, int *used = nullptr) const;
 #endif // datestring
 
     bool potentialValue(const QStringRef &str, int min, int max, int index,
diff --git a/src/corelib/tools/qfreelist_p.h b/src/corelib/tools/qfreelist_p.h
index 63be0952ff..d72d6e1b4b 100644
--- a/src/corelib/tools/qfreelist_p.h
+++ b/src/corelib/tools/qfreelist_p.h
@@ -249,11 +249,11 @@ inline int QFreeList<T, ConstantsType>::next()
 
         if (!v) {
             v = allocate((id & ConstantsType::IndexMask) - at, ConstantsType::Sizes[block]);
-            if (!_v[block].testAndSetRelease(0, v)) {
+            if (!_v[block].testAndSetRelease(nullptr, v)) {
                 // race with another thread lost
                 delete [] v;
                 v = _v[block].loadAcquire();
-                Q_ASSERT(v != 0);
+                Q_ASSERT(v != nullptr);
             }
         }
 
diff --git a/src/corelib/tools/qlist.h b/src/corelib/tools/qlist.h
index 6643288bd5..34577acaa5 100644
--- a/src/corelib/tools/qlist.h
+++ b/src/corelib/tools/qlist.h
@@ -526,7 +526,7 @@ inline typename QList<T>::iterator QList<T>::insert(iterator before, const T &t)
     Q_ASSERT_X(isValidIterator(before), "QList::insert", "The specified iterator argument 'before' is invalid");
 
     int iBefore = int(before.i - reinterpret_cast<Node *>(p.begin()));
-    Node *n = 0;
+    Node *n = nullptr;
     if (d->ref.isShared())
         n = detach_helper_grow(iBefore, 1);
     else
diff --git a/src/corelib/tools/qlocale_p.h b/src/corelib/tools/qlocale_p.h
index 98b6a31a46..1e8dc28fbf 100644
--- a/src/corelib/tools/qlocale_p.h
+++ b/src/corelib/tools/qlocale_p.h
@@ -249,7 +249,7 @@ public:
         if (qIsInf(d))
             return float(d);
         if (std::fabs(d) > std::numeric_limits<float>::max()) {
-            if (ok != 0)
+            if (ok != nullptr)
                 *ok = false;
             const float huge = std::numeric_limits<float>::infinity();
             return d < 0 ? -huge : huge;