Utils: Consistently use nullptr

Fixed by clang-tidy modernize-use-nullptr.

Change-Id: I93edae67271a521e3b2a1f97f486e5fa97009836
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

52 files changed, 101 insertions, 95 deletions

diff --git a/src/libs/utils/annotateditemdelegate.h b/src/libs/utils/annotateditemdelegate.h
index d6223fb379a..ffbcfbd9f4c 100644
--- a/src/libs/utils/annotateditemdelegate.h
+++ b/src/libs/utils/annotateditemdelegate.h
@@ -34,7 +34,7 @@ namespace Utils {
 class QTCREATOR_UTILS_EXPORT AnnotatedItemDelegate : public QStyledItemDelegate
 {
 public:
-    AnnotatedItemDelegate(QObject *parent = 0);
+    AnnotatedItemDelegate(QObject *parent = nullptr);
     ~AnnotatedItemDelegate() override;
 
     void setAnnotationRole(int role);
diff --git a/src/libs/utils/basetreeview.h b/src/libs/utils/basetreeview.h
index 456672d6566..653d9fb22b0 100644
--- a/src/libs/utils/basetreeview.h
+++ b/src/libs/utils/basetreeview.h
@@ -53,7 +53,7 @@ public:
         ItemDelegateRole,
     };
 
-    BaseTreeView(QWidget *parent = 0);
+    BaseTreeView(QWidget *parent = nullptr);
     ~BaseTreeView() override;
 
     void setSettings(QSettings *settings, const QByteArray &key);
diff --git a/src/libs/utils/categorysortfiltermodel.h b/src/libs/utils/categorysortfiltermodel.h
index a0ae25ff694..830ab197491 100644
--- a/src/libs/utils/categorysortfiltermodel.h
+++ b/src/libs/utils/categorysortfiltermodel.h
@@ -34,7 +34,7 @@ namespace Utils {
 class QTCREATOR_UTILS_EXPORT CategorySortFilterModel : public QSortFilterProxyModel
 {
 public:
-    CategorySortFilterModel(QObject *parent = 0);
+    CategorySortFilterModel(QObject *parent = nullptr);
 
 protected:
     bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
diff --git a/src/libs/utils/classnamevalidatinglineedit.h b/src/libs/utils/classnamevalidatinglineedit.h
index a24346cf1be..ecbea82a804 100644
--- a/src/libs/utils/classnamevalidatinglineedit.h
+++ b/src/libs/utils/classnamevalidatinglineedit.h
@@ -38,7 +38,7 @@ class QTCREATOR_UTILS_EXPORT ClassNameValidatingLineEdit : public FancyLineEdit
     Q_PROPERTY(bool lowerCaseFileName READ lowerCaseFileName WRITE setLowerCaseFileName)
 
 public:
-    explicit ClassNameValidatingLineEdit(QWidget *parent = 0);
+    explicit ClassNameValidatingLineEdit(QWidget *parent = nullptr);
     ~ClassNameValidatingLineEdit() override;
 
     bool namespacesEnabled() const;
diff --git a/src/libs/utils/completinglineedit.h b/src/libs/utils/completinglineedit.h
index 1cedaf0b7c3..988e0324c4f 100644
--- a/src/libs/utils/completinglineedit.h
+++ b/src/libs/utils/completinglineedit.h
@@ -35,7 +35,7 @@ class QTCREATOR_UTILS_EXPORT CompletingLineEdit : public QLineEdit
     Q_OBJECT
 
 public:
-    explicit CompletingLineEdit(QWidget *parent = 0);
+    explicit CompletingLineEdit(QWidget *parent = nullptr);
 
 protected:
     bool event(QEvent *e) override;
diff --git a/src/libs/utils/completingtextedit.h b/src/libs/utils/completingtextedit.h
index b45ce886a34..eb09dcb4f81 100644
--- a/src/libs/utils/completingtextedit.h
+++ b/src/libs/utils/completingtextedit.h
@@ -43,7 +43,7 @@ class QTCREATOR_UTILS_EXPORT CompletingTextEdit : public QTextEdit
                READ completionLengthThreshold WRITE setCompletionLengthThreshold)
 
 public:
-    CompletingTextEdit(QWidget *parent = 0);
+    CompletingTextEdit(QWidget *parent = nullptr);
     ~CompletingTextEdit() override;
 
     void setCompleter(QCompleter *c);
diff --git a/src/libs/utils/consoleprocess.h b/src/libs/utils/consoleprocess.h
index 7ebdfbc6786..7c58c55cc69 100644
--- a/src/libs/utils/consoleprocess.h
+++ b/src/libs/utils/consoleprocess.h
@@ -43,7 +43,7 @@ class QTCREATOR_UTILS_EXPORT ConsoleProcess : public QObject
 
 public:
     enum Mode { Run, Debug, Suspend };
-    ConsoleProcess(QObject *parent = 0);
+    ConsoleProcess(QObject *parent = nullptr);
     ~ConsoleProcess() override;
 
     void setWorkingDirectory(const QString &dir);
diff --git a/src/libs/utils/detailsbutton.h b/src/libs/utils/detailsbutton.h
index 2c8dd720439..f66fa2ad4b6 100644
--- a/src/libs/utils/detailsbutton.h
+++ b/src/libs/utils/detailsbutton.h
@@ -37,7 +37,7 @@ class QTCREATOR_UTILS_EXPORT FadingPanel : public QWidget
     Q_OBJECT
 
 public:
-    FadingPanel(QWidget *parent = 0)
+    FadingPanel(QWidget *parent = nullptr)
         : QWidget(parent)
     {}
     virtual void fadeTo(qreal value) = 0;
@@ -48,7 +48,7 @@ class QTCREATOR_UTILS_EXPORT FadingWidget : public FadingPanel
 {
     Q_OBJECT
 public:
-    FadingWidget(QWidget *parent = 0);
+    FadingWidget(QWidget *parent = nullptr);
     void fadeTo(qreal value) override;
     qreal opacity();
     void setOpacity(qreal value) override;
@@ -62,7 +62,7 @@ class QTCREATOR_UTILS_EXPORT DetailsButton : public QAbstractButton
     Q_PROPERTY(float fader READ fader WRITE setFader)
 
 public:
-    DetailsButton(QWidget *parent = 0);
+    DetailsButton(QWidget *parent = nullptr);
 
     QSize sizeHint() const override;
     float fader() { return m_fader; }
diff --git a/src/libs/utils/detailswidget.h b/src/libs/utils/detailswidget.h
index 18f934170bc..f96f0f549d1 100644
--- a/src/libs/utils/detailswidget.h
+++ b/src/libs/utils/detailswidget.h
@@ -52,7 +52,7 @@ public:
         OnlySummary
     };
 
-    explicit DetailsWidget(QWidget *parent = 0);
+    explicit DetailsWidget(QWidget *parent = nullptr);
     ~DetailsWidget() override;
 
     void setSummaryText(const QString &text);
diff --git a/src/libs/utils/elidinglabel.h b/src/libs/utils/elidinglabel.h
index 70b568f123e..6a8bd231954 100644
--- a/src/libs/utils/elidinglabel.h
+++ b/src/libs/utils/elidinglabel.h
@@ -36,8 +36,8 @@ class  QTCREATOR_UTILS_EXPORT ElidingLabel : public QLabel
     Q_PROPERTY(Qt::TextElideMode elideMode READ elideMode WRITE setElideMode DESIGNABLE true)
 
 public:
-    explicit ElidingLabel(QWidget *parent = 0);
-    explicit ElidingLabel(const QString &text, QWidget *parent = 0);
+    explicit ElidingLabel(QWidget *parent = nullptr);
+    explicit ElidingLabel(const QString &text, QWidget *parent = nullptr);
 
     Qt::TextElideMode elideMode() const;
     void setElideMode(const Qt::TextElideMode &elideMode);
diff --git a/src/libs/utils/environmentmodel.h b/src/libs/utils/environmentmodel.h
index b102ba92d31..3eb0ece6cba 100644
--- a/src/libs/utils/environmentmodel.h
+++ b/src/libs/utils/environmentmodel.h
@@ -40,7 +40,7 @@ class QTCREATOR_UTILS_EXPORT EnvironmentModel : public QAbstractTableModel
     Q_OBJECT
 
 public:
-    explicit EnvironmentModel(QObject *parent = 0);
+    explicit EnvironmentModel(QObject *parent = nullptr);
     ~EnvironmentModel() override;
 
     int rowCount(const QModelIndex &parent) const override;
diff --git a/src/libs/utils/faketooltip.h b/src/libs/utils/faketooltip.h
index 4b30cb4c35d..ad335b59307 100644
--- a/src/libs/utils/faketooltip.h
+++ b/src/libs/utils/faketooltip.h
@@ -36,7 +36,7 @@ class QTCREATOR_UTILS_EXPORT FakeToolTip : public QWidget
     Q_OBJECT
 
 public:
-    explicit FakeToolTip(QWidget *parent = 0);
+    explicit FakeToolTip(QWidget *parent = nullptr);
 
 protected:
     void paintEvent(QPaintEvent *e) override;
diff --git a/src/libs/utils/fancylineedit.h b/src/libs/utils/fancylineedit.h
index 9c0b87961f0..8cef228b0d3 100644
--- a/src/libs/utils/fancylineedit.h
+++ b/src/libs/utils/fancylineedit.h
@@ -46,7 +46,7 @@ class QTCREATOR_UTILS_EXPORT IconButton: public QAbstractButton
     Q_PROPERTY(float iconOpacity READ iconOpacity WRITE setIconOpacity)
     Q_PROPERTY(bool autoHide READ hasAutoHide WRITE setAutoHide)
 public:
-    explicit IconButton(QWidget *parent = 0);
+    explicit IconButton(QWidget *parent = nullptr);
     void paintEvent(QPaintEvent *event) override;
     float iconOpacity() { return m_iconOpacity; }
     void setIconOpacity(float value) { m_iconOpacity = value; update(); }
@@ -79,7 +79,7 @@ class QTCREATOR_UTILS_EXPORT FancyLineEdit : public CompletingLineEdit
 public:
     enum Side {Left = 0, Right = 1};
 
-    explicit FancyLineEdit(QWidget *parent = 0);
+    explicit FancyLineEdit(QWidget *parent = nullptr);
     ~FancyLineEdit() override;
 
     QIcon buttonIcon(Side side) const;
diff --git a/src/libs/utils/fancymainwindow.h b/src/libs/utils/fancymainwindow.h
index 772fa3e18ac..be30e2c317c 100644
--- a/src/libs/utils/fancymainwindow.h
+++ b/src/libs/utils/fancymainwindow.h
@@ -42,7 +42,7 @@ class QTCREATOR_UTILS_EXPORT FancyMainWindow : public QMainWindow
     Q_OBJECT
 
 public:
-    explicit FancyMainWindow(QWidget *parent = 0);
+    explicit FancyMainWindow(QWidget *parent = nullptr);
     ~FancyMainWindow() override;
 
     /* The widget passed in should have an objectname set
diff --git a/src/libs/utils/filenamevalidatinglineedit.h b/src/libs/utils/filenamevalidatinglineedit.h
index 99215012638..f0b5bd8b5d4 100644
--- a/src/libs/utils/filenamevalidatinglineedit.h
+++ b/src/libs/utils/filenamevalidatinglineedit.h
@@ -37,15 +37,15 @@ class QTCREATOR_UTILS_EXPORT FileNameValidatingLineEdit : public FancyLineEdit
     Q_PROPERTY(bool forceFirstCapitalLetter READ forceFirstCapitalLetter WRITE setForceFirstCapitalLetter)
 
 public:
-    explicit FileNameValidatingLineEdit(QWidget *parent = 0);
+    explicit FileNameValidatingLineEdit(QWidget *parent = nullptr);
 
     static bool validateFileName(const QString &name,
                                  bool allowDirectories = false,
-                                 QString *errorMessage = 0);
+                                 QString *errorMessage = nullptr);
 
     static bool validateFileNameExtension(const QString &name,
                                           const QStringList &requiredExtensions = QStringList(),
-                                          QString *errorMessage = 0);
+                                          QString *errorMessage = nullptr);
 
     /**
      * Sets whether entering directories is allowed. This will enable the user
diff --git a/src/libs/utils/filesearch.h b/src/libs/utils/filesearch.h
index 8babf004acb..a25949e2205 100644
--- a/src/libs/utils/filesearch.h
+++ b/src/libs/utils/filesearch.h
@@ -144,7 +144,7 @@ public:
     SubDirFileIterator(const QStringList &directories,
                        const QStringList &filters,
                        const QStringList &exclusionFilters,
-                       QTextCodec *encoding = 0);
+                       QTextCodec *encoding = nullptr);
     ~SubDirFileIterator() override;
 
     int maxProgress() const override;
diff --git a/src/libs/utils/filesystemwatcher.h b/src/libs/utils/filesystemwatcher.h
index 9db361659da..1f029eae4d6 100644
--- a/src/libs/utils/filesystemwatcher.h
+++ b/src/libs/utils/filesystemwatcher.h
@@ -44,8 +44,8 @@ public:
         WatchAllChanges
     };
 
-    explicit FileSystemWatcher(QObject *parent = 0);
-    explicit FileSystemWatcher(int id, QObject *parent = 0);
+    explicit FileSystemWatcher(QObject *parent = nullptr);
+    explicit FileSystemWatcher(int id, QObject *parent = nullptr);
     ~FileSystemWatcher() override;
 
     void addFile(const QString &file, WatchMode wm);
diff --git a/src/libs/utils/fileutils.h b/src/libs/utils/fileutils.h
index feb3b0a9dcc..b0068f43418 100644
--- a/src/libs/utils/fileutils.h
+++ b/src/libs/utils/fileutils.h
@@ -112,9 +112,10 @@ using FileNameList = QList<FileName>;
 
 class QTCREATOR_UTILS_EXPORT FileUtils {
 public:
-    static bool removeRecursively(const FileName &filePath, QString *error = 0);
-    static bool copyRecursively(const FileName &srcFilePath, const FileName &tgtFilePath,
-                                QString *error = 0, const std::function<bool (QFileInfo, QFileInfo, QString *)> &copyHelper = std::function<bool (QFileInfo, QFileInfo, QString *)>());
+    static bool removeRecursively(const FileName &filePath, QString *error = nullptr);
+    static bool copyRecursively(
+            const FileName &srcFilePath, const FileName &tgtFilePath, QString *error = nullptr,
+            const std::function<bool (QFileInfo, QFileInfo, QString *)> &copyHelper = nullptr);
     static bool isFileNewerThan(const FileName &filePath, const QDateTime &timeStamp);
     static FileName resolveSymlinks(const FileName &path);
     static FileName canonicalPath(const FileName &path);
diff --git a/src/libs/utils/filewizardpage.h b/src/libs/utils/filewizardpage.h
index 4c3ee48ff4f..ede6c4d3abb 100644
--- a/src/libs/utils/filewizardpage.h
+++ b/src/libs/utils/filewizardpage.h
@@ -40,7 +40,7 @@ class QTCREATOR_UTILS_EXPORT FileWizardPage : public WizardPage
     Q_PROPERTY(QString fileName READ fileName WRITE setFileName DESIGNABLE true)
 
 public:
-    explicit FileWizardPage(QWidget *parent = 0);
+    explicit FileWizardPage(QWidget *parent = nullptr);
     ~FileWizardPage() override;
 
     QString fileName() const;
@@ -55,7 +55,7 @@ public:
     void setForceFirstCapitalLetterForFileName(bool b);
 
     // Validate a base name entry field (potentially containing extension)
-    static bool validateBaseName(const QString &name, QString *errorMessage = 0);
+    static bool validateBaseName(const QString &name, QString *errorMessage = nullptr);
 
 signals:
     void activated();
diff --git a/src/libs/utils/fixedsizeclicklabel.h b/src/libs/utils/fixedsizeclicklabel.h
index 0d83ac667b4..eb89de7ab92 100644
--- a/src/libs/utils/fixedsizeclicklabel.h
+++ b/src/libs/utils/fixedsizeclicklabel.h
@@ -36,7 +36,7 @@ class  QTCREATOR_UTILS_EXPORT FixedSizeClickLabel : public QLabel
     Q_PROPERTY(QString maxText READ maxText WRITE setMaxText DESIGNABLE true)
 
 public:
-    explicit FixedSizeClickLabel(QWidget *parent = 0);
+    explicit FixedSizeClickLabel(QWidget *parent = nullptr);
 
     void setText(const QString &text, const QString &maxText);
     using QLabel::setText;
diff --git a/src/libs/utils/highlightingitemdelegate.h b/src/libs/utils/highlightingitemdelegate.h
index ae184de2d73..a131ef613e1 100644
--- a/src/libs/utils/highlightingitemdelegate.h
+++ b/src/libs/utils/highlightingitemdelegate.h
@@ -44,7 +44,7 @@ enum class HighlightingItemRole {
 class QTCREATOR_UTILS_EXPORT HighlightingItemDelegate : public QItemDelegate
 {
 public:
-    HighlightingItemDelegate(int tabWidth, QObject *parent = 0);
+    HighlightingItemDelegate(int tabWidth, QObject *parent = nullptr);
     void paint(QPainter *painter, const QStyleOptionViewItem &option,
                const QModelIndex &index) const override;
     void setTabWidth(int width);
diff --git a/src/libs/utils/historycompleter.h b/src/libs/utils/historycompleter.h
index 030c3103dfb..108f0d56280 100644
--- a/src/libs/utils/historycompleter.h
+++ b/src/libs/utils/historycompleter.h
@@ -43,7 +43,7 @@ class QTCREATOR_UTILS_EXPORT HistoryCompleter : public QCompleter
 
 public:
     static void setSettings(QSettings *settings);
-    HistoryCompleter(const QString &historyKey, QObject *parent = 0);
+    HistoryCompleter(const QString &historyKey, QObject *parent = nullptr);
     bool removeHistoryItem(int index);
     QString historyItem() const;
     static bool historyExistsFor(const QString &historyKey);
diff --git a/src/libs/utils/itemviews.h b/src/libs/utils/itemviews.h
index 91cfc927fc5..92122a500dc 100644
--- a/src/libs/utils/itemviews.h
+++ b/src/libs/utils/itemviews.h
@@ -49,7 +49,7 @@ template<class BaseT>
 class View : public BaseT
 {
 public:
-    View(QWidget *parent = 0)
+    View(QWidget *parent = nullptr)
         : BaseT(parent)
     {}
     void setActivationMode(ActivationMode mode)
@@ -89,7 +89,7 @@ class QTCREATOR_UTILS_EXPORT TreeView : public View<QTreeView>
 {
     Q_OBJECT
 public:
-    TreeView(QWidget *parent = 0)
+    TreeView(QWidget *parent = nullptr)
         : View<QTreeView>(parent)
     {}
 };
@@ -98,7 +98,7 @@ class QTCREATOR_UTILS_EXPORT TreeWidget : public View<QTreeWidget>
 {
     Q_OBJECT
 public:
-    TreeWidget(QWidget *parent = 0)
+    TreeWidget(QWidget *parent = nullptr)
         : View<QTreeWidget>(parent)
     {}
 };
@@ -107,7 +107,7 @@ class QTCREATOR_UTILS_EXPORT ListView : public View<QListView>
 {
     Q_OBJECT
 public:
-    ListView(QWidget *parent = 0)
+    ListView(QWidget *parent = nullptr)
         : View<QListView>(parent)
     {}
 };
@@ -116,7 +116,7 @@ class QTCREATOR_UTILS_EXPORT ListWidget : public View<QListWidget>
 {
     Q_OBJECT
 public:
-    ListWidget(QWidget *parent = 0)
+    ListWidget(QWidget *parent = nullptr)
         : View<QListWidget>(parent)
     {}
 };
diff --git a/src/libs/utils/json.h b/src/libs/utils/json.h
index c55fa791967..df7881a55e2 100644
--- a/src/libs/utils/json.h
+++ b/src/libs/utils/json.h
@@ -82,13 +82,13 @@ public:
     Kind kind() const { return m_kind; }
     static QString kindToString(Kind kind);
 
-    virtual JsonStringValue *toString() { return 0; }
-    virtual JsonDoubleValue *toDouble() { return 0; }
-    virtual JsonIntValue *toInt() { return 0; }
-    virtual JsonObjectValue *toObject() { return 0; }
-    virtual JsonArrayValue *toArray() { return 0; }
-    virtual JsonBooleanValue *toBoolean() { return 0; }
-    virtual JsonNullValue *toNull() { return 0; }
+    virtual JsonStringValue *toString() { return nullptr; }
+    virtual JsonDoubleValue *toDouble() { return nullptr; }
+    virtual JsonIntValue *toInt() { return nullptr; }
+    virtual JsonObjectValue *toObject() { return nullptr; }
+    virtual JsonArrayValue *toArray() { return nullptr; }
+    virtual JsonBooleanValue *toBoolean() { return nullptr; }
+    virtual JsonNullValue *toNull() { return nullptr; }
 
     static JsonValue *create(const QString &s, JsonMemoryPool *pool);
     void *operator new(size_t size, JsonMemoryPool *pool);
@@ -399,7 +399,7 @@ public:
 private:
     struct JsonSchemaData
     {
-        JsonSchemaData(const QString &absoluteFileName, JsonSchema *schema = 0)
+        JsonSchemaData(const QString &absoluteFileName, JsonSchema *schema = nullptr)
             : m_absoluteFileName(absoluteFileName)
             , m_schema(schema)
         {}
diff --git a/src/libs/utils/macroexpander.h b/src/libs/utils/macroexpander.h
index a8fd1afdabe..ff96eb10899 100644
--- a/src/libs/utils/macroexpander.h
+++ b/src/libs/utils/macroexpander.h
@@ -52,7 +52,7 @@ public:
 
     bool resolveMacro(const QString &name, QString *ret) const;
 
-    QString value(const QByteArray &variable, bool *found = 0) const;
+    QString value(const QByteArray &variable, bool *found = nullptr) const;
 
     QString expand(const QString &stringWithVariables) const;
     QByteArray expand(const QByteArray &stringWithVariables) const;
diff --git a/src/libs/utils/mimetypes/mimedatabase.h b/src/libs/utils/mimetypes/mimedatabase.h
index 021accf78dd..1a1c5c8a28c 100644
--- a/src/libs/utils/mimetypes/mimedatabase.h
+++ b/src/libs/utils/mimetypes/mimedatabase.h
@@ -77,7 +77,7 @@ enum class MimeStartupPhase {
 
 QTCREATOR_UTILS_EXPORT void setMimeStartupPhase(MimeStartupPhase);
 QTCREATOR_UTILS_EXPORT void addMimeTypes(const QString &id, const QByteArray &data);
-QTCREATOR_UTILS_EXPORT QString allFiltersString(QString *allFilesFilter = 0);
+QTCREATOR_UTILS_EXPORT QString allFiltersString(QString *allFilesFilter = nullptr);
 QTCREATOR_UTILS_EXPORT QString allFilesFilterString();
 QTCREATOR_UTILS_EXPORT QStringList allGlobPatterns();
 QTCREATOR_UTILS_EXPORT QMap<int, QList<Internal::MimeMagicRule> > magicRulesForMimeType(const MimeType &mimeType); // priority -> rules
diff --git a/src/libs/utils/mimetypes/mimemagicrule_p.h b/src/libs/utils/mimetypes/mimemagicrule_p.h
index e1c80179032..1513750a298 100644
--- a/src/libs/utils/mimetypes/mimemagicrule_p.h
+++ b/src/libs/utils/mimetypes/mimemagicrule_p.h
@@ -71,7 +71,7 @@ public:
     enum Type { Invalid = 0, String, RegExp, Host16, Host32, Big16, Big32, Little16, Little32, Byte };
 
     MimeMagicRule(Type type, const QByteArray &value, int startPos, int endPos,
-                  const QByteArray &mask = QByteArray(), QString *errorString = 0);
+                  const QByteArray &mask = QByteArray(), QString *errorString = nullptr);
     MimeMagicRule(const MimeMagicRule &other);
     ~MimeMagicRule();
 
diff --git a/src/libs/utils/navigationtreeview.h b/src/libs/utils/navigationtreeview.h
index a99539d51be..ced2b797a89 100644
--- a/src/libs/utils/navigationtreeview.h
+++ b/src/libs/utils/navigationtreeview.h
@@ -35,7 +35,7 @@ class QTCREATOR_UTILS_EXPORT NavigationTreeView : public TreeView
 {
     Q_OBJECT
 public:
-    explicit NavigationTreeView(QWidget *parent = 0);
+    explicit NavigationTreeView(QWidget *parent = nullptr);
     void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) override;
 
 protected:
diff --git a/src/libs/utils/networkaccessmanager.h b/src/libs/utils/networkaccessmanager.h
index 94c26109fdd..4f09123aab2 100644
--- a/src/libs/utils/networkaccessmanager.h
+++ b/src/libs/utils/networkaccessmanager.h
@@ -37,7 +37,7 @@ class QTCREATOR_UTILS_EXPORT NetworkAccessManager : public QNetworkAccessManager
 {
     Q_OBJECT
 public:
-    NetworkAccessManager(QObject *parent = 0);
+    NetworkAccessManager(QObject *parent = nullptr);
 
     static NetworkAccessManager *instance();
 
diff --git a/src/libs/utils/newclasswidget.h b/src/libs/utils/newclasswidget.h
index 53dd1de0873..8790b21b7c1 100644
--- a/src/libs/utils/newclasswidget.h
+++ b/src/libs/utils/newclasswidget.h
@@ -77,7 +77,7 @@ public:
                      SharedDataClass
                    };
 
-    explicit NewClassWidget(QWidget *parent = 0);
+    explicit NewClassWidget(QWidget *parent = nullptr);
     ~NewClassWidget() override;
 
     bool namespacesEnabled() const;
@@ -106,7 +106,7 @@ public:
     QString namesDelimiter() const;
     bool isClassTypeComboVisible() const;
 
-    bool isValid(QString *error = 0) const;
+    bool isValid(QString *error = nullptr) const;
 
     QStringList files() const;
 
diff --git a/src/libs/utils/parameteraction.h b/src/libs/utils/parameteraction.h
index a402844987f..627d40fb5fc 100644
--- a/src/libs/utils/parameteraction.h
+++ b/src/libs/utils/parameteraction.h
@@ -44,7 +44,7 @@ public:
     explicit ParameterAction(const QString &emptyText,
                              const QString &parameterText,
                              EnablingMode em = AlwaysEnabled,
-                             QObject *parent = 0);
+                             QObject *parent = nullptr);
 
     QString emptyText() const;
     void setEmptyText(const QString &);
diff --git a/src/libs/utils/pathlisteditor.h b/src/libs/utils/pathlisteditor.h
index fa14f5ee2c7..07392fbe6ed 100644
--- a/src/libs/utils/pathlisteditor.h
+++ b/src/libs/utils/pathlisteditor.h
@@ -46,7 +46,7 @@ class QTCREATOR_UTILS_EXPORT PathListEditor : public QWidget
     Q_PROPERTY(QString fileDialogTitle READ fileDialogTitle WRITE setFileDialogTitle DESIGNABLE true)
 
 public:
-    explicit PathListEditor(QWidget *parent = 0);
+    explicit PathListEditor(QWidget *parent = nullptr);
     ~PathListEditor() override;
 
     QString pathListString() const;
diff --git a/src/libs/utils/projectintropage.h b/src/libs/utils/projectintropage.h
index 98b51693ae0..909ad7d576e 100644
--- a/src/libs/utils/projectintropage.h
+++ b/src/libs/utils/projectintropage.h
@@ -42,7 +42,7 @@ class QTCREATOR_UTILS_EXPORT ProjectIntroPage : public WizardPage
     Q_PROPERTY(bool forceSubProject READ forceSubProject WRITE setForceSubProject DESIGNABLE true)
 
 public:
-    explicit ProjectIntroPage(QWidget *parent = 0);
+    explicit ProjectIntroPage(QWidget *parent = nullptr);
     ~ProjectIntroPage() override;
 
     QString projectName() const;
diff --git a/src/libs/utils/proxyaction.h b/src/libs/utils/proxyaction.h
index a5c423098ef..5058bb42f3d 100644
--- a/src/libs/utils/proxyaction.h
+++ b/src/libs/utils/proxyaction.h
@@ -43,7 +43,7 @@ public:
     };
     Q_DECLARE_FLAGS(Attributes, Attribute)
 
-    explicit ProxyAction(QObject *parent = 0);
+    explicit ProxyAction(QObject *parent = nullptr);
 
     void initialize(QAction *action);
 
diff --git a/src/libs/utils/proxycredentialsdialog.h b/src/libs/utils/proxycredentialsdialog.h
index 5e39baf27c4..13f380a15cf 100644
--- a/src/libs/utils/proxycredentialsdialog.h
+++ b/src/libs/utils/proxycredentialsdialog.h
@@ -41,7 +41,7 @@ class QTCREATOR_UTILS_EXPORT ProxyCredentialsDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit ProxyCredentialsDialog(const QNetworkProxy &proxy, QWidget *parent = 0);
+    explicit ProxyCredentialsDialog(const QNetworkProxy &proxy, QWidget *parent = nullptr);
     ~ProxyCredentialsDialog() override;
 
     QString userName() const;
diff --git a/src/libs/utils/qtcolorbutton.h b/src/libs/utils/qtcolorbutton.h
index 12dd82be145..207c9ebe6b4 100644
--- a/src/libs/utils/qtcolorbutton.h
+++ b/src/libs/utils/qtcolorbutton.h
@@ -38,7 +38,7 @@ class QTCREATOR_UTILS_EXPORT QtColorButton : public QToolButton
     Q_PROPERTY(bool alphaAllowed READ isAlphaAllowed WRITE setAlphaAllowed)
     Q_PROPERTY(QColor color READ color WRITE setColor)
 public:
-    QtColorButton(QWidget *parent = 0);
+    QtColorButton(QWidget *parent = nullptr);
     ~QtColorButton() override;
 
     bool isBackgroundCheckered() const;
diff --git a/src/libs/utils/qtcprocess.h b/src/libs/utils/qtcprocess.h
index 89b1cc56fc5..4ff75a7daef 100644
--- a/src/libs/utils/qtcprocess.h
+++ b/src/libs/utils/qtcprocess.h
@@ -37,7 +37,7 @@ class QTCREATOR_UTILS_EXPORT QtcProcess : public QProcess
     Q_OBJECT
 
 public:
-    QtcProcess(QObject *parent = 0);
+    QtcProcess(QObject *parent = nullptr);
     void setEnvironment(const Environment &env)
         { m_environment = env; m_haveEnv = true; }
     void setCommand(const QString &command, const QString &arguments)
@@ -80,19 +80,19 @@ public:
     //! Prepare argument of a shell command for feeding into QProcess
     static Arguments prepareArgs(const QString &cmd, SplitError *err,
                                  OsType osType = HostOsInfo::hostOs(),
-                                 const Environment *env = 0, const QString *pwd = 0);
+                                 const Environment *env = nullptr, const QString *pwd = nullptr);
     //! Prepare a shell command for feeding into QProcess
     static bool prepareCommand(const QString &command, const QString &arguments,
                                QString *outCmd, Arguments *outArgs, OsType osType = HostOsInfo::hostOs(),
-                               const Environment *env = 0, const QString *pwd = 0);
+                               const Environment *env = nullptr, const QString *pwd = nullptr);
     //! Quote and append each argument to a shell command
     static void addArgs(QString *args, const QStringList &inArgs);
     //! Append already quoted arguments to a shell command
     static void addArgs(QString *args, const QString &inArgs);
     //! Split a shell command into separate arguments. ArgIterator is usually a better choice.
     static QStringList splitArgs(const QString &cmd, OsType osType = HostOsInfo::hostOs(),
-                                 bool abortOnMeta = false, SplitError *err = 0,
-                                 const Environment *env = 0, const QString *pwd = 0);
+                                 bool abortOnMeta = false, SplitError *err = nullptr,
+                                 const Environment *env = nullptr, const QString *pwd = nullptr);
     //! Safely replace the expandos in a shell command
     static bool expandMacros(QString *cmd, AbstractMacroExpander *mx,
                              OsType osType = HostOsInfo::hostOs());
diff --git a/src/libs/utils/removefiledialog.h b/src/libs/utils/removefiledialog.h
index 4543e663f31..42802233147 100644
--- a/src/libs/utils/removefiledialog.h
+++ b/src/libs/utils/removefiledialog.h
@@ -38,7 +38,7 @@ class QTCREATOR_UTILS_EXPORT RemoveFileDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit RemoveFileDialog(const QString &filePath, QWidget *parent = 0);
+    explicit RemoveFileDialog(const QString &filePath, QWidget *parent = nullptr);
     ~RemoveFileDialog() override;
 
     void setDeleteFileVisible(bool visible);
diff --git a/src/libs/utils/runextensions.h b/src/libs/utils/runextensions.h
index 30590ade30c..49752234630 100644
--- a/src/libs/utils/runextensions.h
+++ b/src/libs/utils/runextensions.h
@@ -53,7 +53,7 @@ static testCallOperatorNo testCallOperator(...);
 template<typename T>
 struct hasCallOperator
 {
-    static const bool value = (sizeof(testCallOperator<T>(0)) == sizeof(testCallOperatorYes));
+    static const bool value = (sizeof(testCallOperator<T>(nullptr)) == sizeof(testCallOperatorYes));
 };
 
 namespace Utils {
@@ -379,7 +379,7 @@ private:
 class QTCREATOR_UTILS_EXPORT RunnableThread : public QThread
 {
 public:
-    explicit RunnableThread(QRunnable *runnable, QObject *parent = 0);
+    explicit RunnableThread(QRunnable *runnable, QObject *parent = nullptr);
 
 protected:
     void run() override;
diff --git a/src/libs/utils/savedaction.h b/src/libs/utils/savedaction.h
index 4fb98496b49..45454939f19 100644
--- a/src/libs/utils/savedaction.h
+++ b/src/libs/utils/savedaction.h
@@ -42,7 +42,7 @@ class QTCREATOR_UTILS_EXPORT SavedAction : public QAction
     Q_OBJECT
 
 public:
-    SavedAction(QObject *parent = 0);
+    SavedAction(QObject *parent = nullptr);
 
     QVariant value() const;
     void setValue(const QVariant &value, bool doemit = true);
diff --git a/src/libs/utils/statuslabel.h b/src/libs/utils/statuslabel.h
index 8a2ffc22328..470040d5724 100644
--- a/src/libs/utils/statuslabel.h
+++ b/src/libs/utils/statuslabel.h
@@ -37,7 +37,7 @@ class QTCREATOR_UTILS_EXPORT StatusLabel : public QLabel
 {
     Q_OBJECT
 public:
-    explicit StatusLabel(QWidget *parent = 0);
+    explicit StatusLabel(QWidget *parent = nullptr);
 
 public slots:
     void showStatusMessage(const QString &message, int timeoutMS = 5000);
diff --git a/src/libs/utils/styledbar.h b/src/libs/utils/styledbar.h
index 7b5d67fd59a..972716d9e8e 100644
--- a/src/libs/utils/styledbar.h
+++ b/src/libs/utils/styledbar.h
@@ -35,7 +35,7 @@ class QTCREATOR_UTILS_EXPORT StyledBar : public QWidget
 {
     Q_OBJECT
 public:
-    StyledBar(QWidget *parent = 0);
+    StyledBar(QWidget *parent = nullptr);
     void setSingleRow(bool singleRow);
     bool isSingleRow() const;
 
@@ -50,7 +50,7 @@ class QTCREATOR_UTILS_EXPORT StyledSeparator : public QWidget
 {
     Q_OBJECT
 public:
-    StyledSeparator(QWidget *parent = 0);
+    StyledSeparator(QWidget *parent = nullptr);
 protected:
     void paintEvent(QPaintEvent *event) override;
 };
diff --git a/src/libs/utils/synchronousprocess.h b/src/libs/utils/synchronousprocess.h
index bbf21c11f2c..b1901207d8e 100644
--- a/src/libs/utils/synchronousprocess.h
+++ b/src/libs/utils/synchronousprocess.h
@@ -138,8 +138,10 @@ public:
     // detection similar SynchronousProcess' handling (taking effect after no more output
     // occurs on stderr/stdout as opposed to waitForFinished()). Returns false if a timeout
     // occurs. Checking of the process' exit state/code still has to be done.
-    static bool readDataFromProcess(QProcess &p, int timeoutS,
-                                    QByteArray *rawStdOut = 0, QByteArray *rawStdErr = 0,
+    static bool readDataFromProcess(QProcess &p,
+                                    int timeoutS,
+                                    QByteArray *rawStdOut = nullptr,
+                                    QByteArray *rawStdErr = nullptr,
                                     bool timeOutMessageBox = false);
     // Stop a process by first calling terminate() (allowing for signal handling) and
     // then kill().
diff --git a/src/libs/utils/textfieldcheckbox.h b/src/libs/utils/textfieldcheckbox.h
index ad585255efc..3fea4f1ec32 100644
--- a/src/libs/utils/textfieldcheckbox.h
+++ b/src/libs/utils/textfieldcheckbox.h
@@ -38,7 +38,7 @@ class QTCREATOR_UTILS_EXPORT TextFieldCheckBox : public QCheckBox {
     Q_PROPERTY(QString falseText READ falseText WRITE setFalseText)
     Q_OBJECT
 public:
-    explicit TextFieldCheckBox(const QString &text, QWidget *parent = 0);
+    explicit TextFieldCheckBox(const QString &text, QWidget *parent = nullptr);
 
     QString text() const;
     void setText(const QString &s);
diff --git a/src/libs/utils/textfieldcombobox.h b/src/libs/utils/textfieldcombobox.h
index 937a290cad2..a10906bcbc9 100644
--- a/src/libs/utils/textfieldcombobox.h
+++ b/src/libs/utils/textfieldcombobox.h
@@ -36,7 +36,7 @@ class QTCREATOR_UTILS_EXPORT TextFieldComboBox : public QComboBox {
     Q_PROPERTY(QString indexText READ text WRITE setText)
     Q_OBJECT
 public:
-    explicit TextFieldComboBox(QWidget *parent = 0);
+    explicit TextFieldComboBox(QWidget *parent = nullptr);
 
     QString text() const;
     void setText(const QString &s);
diff --git a/src/libs/utils/textfileformat.h b/src/libs/utils/textfileformat.h
index 6cb6c7ede8c..ab432a53d6d 100644
--- a/src/libs/utils/textfileformat.h
+++ b/src/libs/utils/textfileformat.h
@@ -67,10 +67,10 @@ public:
 
     static ReadResult readFile(const QString &fileName, const QTextCodec *defaultCodec,
                                QStringList *plainText, TextFileFormat *format, QString *errorString,
-                               QByteArray *decodingErrorSample = 0);
+                               QByteArray *decodingErrorSample = nullptr);
     static ReadResult readFile(const QString &fileName, const QTextCodec *defaultCodec,
                                QString *plainText, TextFileFormat *format, QString *errorString,
-                               QByteArray *decodingErrorSample = 0);
+                               QByteArray *decodingErrorSample = nullptr);
     static ReadResult readFileUTF8(const QString &fileName, const QTextCodec *defaultCodec,
                                    QByteArray *plainText, QString *errorString);
 
diff --git a/src/libs/utils/theme/theme.h b/src/libs/utils/theme/theme.h
index da0b78f7a7e..62eac0ade7d 100644
--- a/src/libs/utils/theme/theme.h
+++ b/src/libs/utils/theme/theme.h
@@ -48,7 +48,7 @@ class QTCREATOR_UTILS_EXPORT Theme : public QObject
     Q_ENUMS(WidgetStyle)
 
 public:
-    Theme(const QString &id, QObject *parent = 0);
+    Theme(const QString &id, QObject *parent = nullptr);
     ~Theme() override;
 
     enum Color {
diff --git a/src/libs/utils/tooltip/tooltip.h b/src/libs/utils/tooltip/tooltip.h
index c3139723b12..ece289b66b4 100644
--- a/src/libs/utils/tooltip/tooltip.h
+++ b/src/libs/utils/tooltip/tooltip.h
@@ -71,13 +71,13 @@ public:
 
     static ToolTip *instance();
 
-    static void show(const QPoint &pos, const QString &content, QWidget *w = 0,
+    static void show(const QPoint &pos, const QString &content, QWidget *w = nullptr,
                      const QString &helpId = QString(), const QRect &rect = QRect());
-    static void show(const QPoint &pos, const QColor &color, QWidget *w = 0,
+    static void show(const QPoint &pos, const QColor &color, QWidget *w = nullptr,
                      const QString &helpId = QString(), const QRect &rect = QRect());
-    static void show(const QPoint &pos, QWidget *content, QWidget *w = 0,
+    static void show(const QPoint &pos, QWidget *content, QWidget *w = nullptr,
                      const QString &helpId = QString(), const QRect &rect = QRect());
-    static void show(const QPoint &pos, QLayout *content, QWidget *w = 0,
+    static void show(const QPoint &pos, QLayout *content, QWidget *w = nullptr,
                      const QString &helpId = QString(), const QRect &rect = QRect());
     static void move(const QPoint &pos, QWidget *w);
     static void hide();
diff --git a/src/libs/utils/treemodel.h b/src/libs/utils/treemodel.h
index 930f6f5e2ec..bf20b75c8d2 100644
--- a/src/libs/utils/treemodel.h
+++ b/src/libs/utils/treemodel.h
@@ -170,8 +170,8 @@ class QTCREATOR_UTILS_EXPORT BaseTreeModel : public QAbstractItemModel
     Q_OBJECT
 
 protected:
-    explicit BaseTreeModel(QObject *parent = 0);
-    explicit BaseTreeModel(TreeItem *root, QObject *parent = 0);
+    explicit BaseTreeModel(QObject *parent = nullptr);
+    explicit BaseTreeModel(TreeItem *root, QObject *parent = nullptr);
     ~BaseTreeModel() override;
 
     void setHeader(const QStringList &displays);
@@ -269,8 +269,8 @@ public:
     using RootItem = typename Internal::SelectType<0, LevelItemTypes...>::Type;
     using BestItem = typename Internal::BestItemType<LevelItemTypes...>::Type;
 
-    explicit TreeModel(QObject *parent = 0) : BaseTreeModel(new RootItem, parent) {}
-    explicit TreeModel(RootItem *root, QObject *parent = 0) : BaseTreeModel(root, parent) {}
+    explicit TreeModel(QObject *parent = nullptr) : BaseTreeModel(new RootItem, parent) {}
+    explicit TreeModel(RootItem *root, QObject *parent = nullptr) : BaseTreeModel(root, parent) {}
 
     using BaseTreeModel::canFetchMore;
     using BaseTreeModel::clear;
@@ -307,14 +307,17 @@ public:
     }
 
     template<int Level>
-    typename Internal::SelectType<Level, LevelItemTypes...>::Type *itemForIndexAtLevel(const QModelIndex &idx) const {
-       TreeItem *item = BaseTreeModel::itemForIndex(idx);
-        return item && item->level() == Level ? static_cast<typename Internal::SelectType<Level, LevelItemTypes...>::Type *>(item) : 0;
+    typename Internal::SelectType<Level, LevelItemTypes...>::Type *itemForIndexAtLevel(
+            const QModelIndex &idx) const {
+        TreeItem *item = BaseTreeModel::itemForIndex(idx);
+        return item && item->level() == Level
+                ? static_cast<typename Internal::SelectType<Level, LevelItemTypes...>::Type *>(item)
+                : nullptr;
     }
 
     BestItem *nonRootItemForIndex(const QModelIndex &idx) const {
         TreeItem *item = BaseTreeModel::itemForIndex(idx);
-        return item && item->parent() ? static_cast<BestItem *>(item) : 0;
+        return item && item->parent() ? static_cast<BestItem *>(item) : nullptr;
     }
 
     template <class Predicate>
diff --git a/src/libs/utils/treeviewcombobox.h b/src/libs/utils/treeviewcombobox.h
index 9377c1ff0c4..0bdfc73cbb0 100644
--- a/src/libs/utils/treeviewcombobox.h
+++ b/src/libs/utils/treeviewcombobox.h
@@ -36,7 +36,7 @@ class QTCREATOR_UTILS_EXPORT TreeViewComboBoxView : public QTreeView
 {
     Q_OBJECT
 public:
-    TreeViewComboBoxView(QWidget *parent = 0);
+    TreeViewComboBoxView(QWidget *parent = nullptr);
     void adjustWidth(int width);
 };
 
@@ -44,7 +44,7 @@ class QTCREATOR_UTILS_EXPORT TreeViewComboBox : public QComboBox
 {
     Q_OBJECT
 public:
-    TreeViewComboBox(QWidget *parent = 0);
+    TreeViewComboBox(QWidget *parent = nullptr);
 
     void wheelEvent(QWheelEvent *e) override;
     void keyPressEvent(QKeyEvent *e) override;
diff --git a/src/libs/utils/wizard.h b/src/libs/utils/wizard.h
index 88d0641d845..6075527113a 100644
--- a/src/libs/utils/wizard.h
+++ b/src/libs/utils/wizard.h
@@ -43,7 +43,7 @@ class QTCREATOR_UTILS_EXPORT Wizard : public QWizard
     Q_PROPERTY(bool automaticProgressCreationEnabled READ isAutomaticProgressCreationEnabled WRITE setAutomaticProgressCreationEnabled)
 
 public:
-    explicit Wizard(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    explicit Wizard(QWidget *parent = nullptr, Qt::WindowFlags flags = nullptr);
     ~Wizard() override;
 
     bool isAutomaticProgressCreationEnabled() const;
@@ -93,7 +93,7 @@ class QTCREATOR_UTILS_EXPORT WizardProgress : public QObject
     Q_OBJECT
 
 public:
-    WizardProgress(QObject *parent = 0);
+    WizardProgress(QObject *parent = nullptr);
     ~WizardProgress() override;
 
     WizardProgressItem *addItem(const QString &title);
diff --git a/src/libs/utils/wizardpage.h b/src/libs/utils/wizardpage.h
index 87fac3ba8db..fa8c60b052b 100644
--- a/src/libs/utils/wizardpage.h
+++ b/src/libs/utils/wizardpage.h
@@ -74,7 +74,7 @@ class QTCREATOR_UTILS_EXPORT WizardPage : public QWizardPage
     Q_OBJECT
 
 public:
-    explicit WizardPage(QWidget *parent = 0);
+    explicit WizardPage(QWidget *parent = nullptr);
 
     virtual void pageWasAdded(); // called when this page was added to a Utils::Wizard
 
@@ -86,7 +86,7 @@ public:
     }
 
     void registerFieldWithName(const QString &name, QWidget *widget,
-                               const char *property = 0, const char *changedSignal = 0);
+                               const char *property = nullptr, const char *changedSignal = nullptr);
 
     virtual bool handleReject();
     virtual bool handleAccept();