Use Q_NULLPTR

birthdaymodel.h

@@ -70,7 +70,7 @@ class BirthdaySortModel : public QSortFilterProxyModel
 {
         Q_OBJECT
     public:
-        explicit BirthdaySortModel(QObject* parent = 0);
+        explicit BirthdaySortModel(QObject* parent = Q_NULLPTR);
 
         void setPrefixSuffix(const QString& prefix, const QString& suffix);
 

collectionmodel.h

@@ -50,7 +50,7 @@ class CollectionListModel : public KDescendantsProxyModel
 {
         Q_OBJECT
     public:
-        explicit CollectionListModel(QObject* parent = 0);
+        explicit CollectionListModel(QObject* parent = Q_NULLPTR);
         void setEventTypeFilter(CalEvent::Type);
         void setFilterWritable(bool writable);
         void setFilterEnabled(bool enabled);
@@ -113,7 +113,7 @@ class CollectionFilterCheckListModel : public QSortFilterProxyModel
 {
         Q_OBJECT
     public:
-        explicit CollectionFilterCheckListModel(QObject* parent = 0);
+        explicit CollectionFilterCheckListModel(QObject* parent = Q_NULLPTR);
         void setEventTypeFilter(CalEvent::Type);
         Akonadi::Collection collection(int row) const;
         Akonadi::Collection collection(const QModelIndex&) const;
@@ -288,7 +288,7 @@ class CollectionControlModel : public Akonadi::FavoriteCollectionsModel
         void collectionPopulated();
 
     private:
-        explicit CollectionControlModel(QObject* parent = 0);
+        explicit CollectionControlModel(QObject* parent = Q_NULLPTR);
         void findEnabledCollections(const Akonadi::EntityMimeTypeFilterModel*, const QModelIndex& parent, Akonadi::Collection::List&) const;
         CalEvent::Types setEnabledStatus(const Akonadi::Collection&, CalEvent::Types, bool inserted);
         static CalEvent::Types checkTypesToEnable(const Akonadi::Collection&, const Akonadi::Collection::List&, CalEvent::Types);

itemlistmodel.h

@@ -42,7 +42,7 @@ class ItemListModel : public Akonadi::EntityMimeTypeFilterModel
         /** Constructor.
          *  @param allowed the alarm types (active/archived/template) included in this model
          */
-        explicit ItemListModel(CalEvent::Types allowed, QObject* parent = 0);
+        explicit ItemListModel(CalEvent::Types allowed, QObject* parent = Q_NULLPTR);
 
         CalEvent::Types includedTypes() const  { return mAllowedTypes; }
         KAEvent      event(int row) const;

lib/stackedwidgets.h

@@ -68,7 +68,7 @@ template <class T>
 class StackedGroupT : public QObject
 {
     public:
-        explicit StackedGroupT(QObject* parent = 0) : QObject(parent) {}
+        explicit StackedGroupT(QObject* parent = Q_NULLPTR) : QObject(parent) {}
         void  addWidget(StackedWidgetT<T>* w)     { mWidgets += w; }
         void  removeWidget(StackedWidgetT<T>* w)  { mWidgets.removeAll(w); }
         virtual QSize minimumSizeHint() const;