Add `explicit' to some constructors that need it.

app/mainwindow.h

@@ -32,7 +32,7 @@ class MainWindow: public KParts::MainWindow
 {
     Q_OBJECT
 public:
-    MainWindow(QWidget *parent = 0);
+    explicit MainWindow(QWidget *parent = 0);
     ~MainWindow();
     bool loadPart();
 

kerfuffle/addtoarchive.h

@@ -52,7 +52,7 @@ class KERFUFFLE_EXPORT AddToArchive : public KJob
     Q_OBJECT
 
 public:
-    AddToArchive(QObject *parent = 0);
+    explicit AddToArchive(QObject *parent = 0);
     ~AddToArchive();
 
     bool showAddDialog();

kerfuffle/extractiondialog.h

@@ -41,7 +41,7 @@ class KERFUFFLE_EXPORT ExtractionDialog : public KDirSelectDialog
 {
     Q_OBJECT
 public:
-    ExtractionDialog(QWidget *parent = 0);
+    explicit ExtractionDialog(QWidget *parent = 0);
     virtual ~ExtractionDialog();
 
     void setShowSelectedFiles(bool);

part/archivemodel.h

@@ -42,7 +42,7 @@ class ArchiveModel: public QAbstractItemModel
 {
     Q_OBJECT
 public:
-    ArchiveModel(const QString &dbusPathName, QObject *parent = 0);
+    explicit ArchiveModel(const QString &dbusPathName, QObject *parent = 0);
     ~ArchiveModel();
 
     QVariant data(const QModelIndex &index, int role) const;

part/archiveview.h

@@ -29,7 +29,7 @@ class ArchiveView : public QTreeView
     Q_OBJECT
 
 public:
-    ArchiveView(QWidget *parent = 0);
+    explicit ArchiveView(QWidget *parent = 0);
     virtual void dragEnterEvent(class QDragEnterEvent * event);
     virtual void dropEvent(class QDropEvent * event);
     virtual void dragMoveEvent(class QDragMoveEvent * event);

part/jobtracker.h

@@ -33,7 +33,7 @@ class JobTrackerWidget: public QFrame, public Ui::JobTrackerWidget
     Q_OBJECT
 
 public:
-    JobTrackerWidget(QWidget *parent = 0);
+    explicit JobTrackerWidget(QWidget *parent = 0);
 };
 
 class JobTracker: public KAbstractWidgetJobTracker
@@ -41,7 +41,7 @@ class JobTracker: public KAbstractWidgetJobTracker
     Q_OBJECT
 
 public:
-    JobTracker(QWidget *parent = 0);
+    explicit JobTracker(QWidget *parent = 0);
     ~JobTracker();
 
     virtual QWidget *widget(KJob *);