Add explicit and make public headers compile with -Wzero-as-null-pointer-constant

... or equivalent.

QtBase 5.6 headers already compile that way, so let the other
modules follow suit.

Added explicit where it was missing. This is not a source-
incompatible change, because code that breaks by this is
a bug. Let's not have this sitting around in an LTS.

Change-Id: I579e8714f94884dc555b673c9f85508f17cdc99d
Task-number: QTBUG-45291
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/datavisualization/data/qscatter3dseries.h b/src/datavisualization/data/qscatter3dseries.h
index 8a0bce5b..b88dcda2 100644
--- a/src/datavisualization/data/qscatter3dseries.h
+++ b/src/datavisualization/data/qscatter3dseries.h
@@ -37,8 +37,8 @@ class QT_DATAVISUALIZATION_EXPORT QScatter3DSeries : public QAbstract3DSeries
     Q_PROPERTY(float itemSize READ itemSize WRITE setItemSize NOTIFY itemSizeChanged)
 
 public:
-    explicit QScatter3DSeries(QObject *parent = 0);
-    explicit QScatter3DSeries(QScatterDataProxy *dataProxy, QObject *parent = 0);
+    explicit QScatter3DSeries(QObject *parent = Q_NULLPTR);
+    explicit QScatter3DSeries(QScatterDataProxy *dataProxy, QObject *parent = Q_NULLPTR);
     virtual ~QScatter3DSeries();
 
     void setDataProxy(QScatterDataProxy *proxy);
@@ -57,7 +57,7 @@ Q_SIGNALS:
     void itemSizeChanged(float size);
 
 protected:
-    explicit QScatter3DSeries(QScatter3DSeriesPrivate *d, QObject *parent = 0);
+    explicit QScatter3DSeries(QScatter3DSeriesPrivate *d, QObject *parent = Q_NULLPTR);
     QScatter3DSeriesPrivate *dptr();
     const QScatter3DSeriesPrivate *dptrc() const;