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/qsurface3dseries.h b/src/datavisualization/data/qsurface3dseries.h
index ffdbcb62..b99213ce 100644
--- a/src/datavisualization/data/qsurface3dseries.h
+++ b/src/datavisualization/data/qsurface3dseries.h
@@ -49,8 +49,8 @@ public:
     };
     Q_DECLARE_FLAGS(DrawFlags, DrawFlag)
 
-    explicit QSurface3DSeries(QObject *parent = 0);
-    explicit QSurface3DSeries(QSurfaceDataProxy *dataProxy, QObject *parent = 0);
+    explicit QSurface3DSeries(QObject *parent = Q_NULLPTR);
+    explicit QSurface3DSeries(QSurfaceDataProxy *dataProxy, QObject *parent = Q_NULLPTR);
     virtual ~QSurface3DSeries();
 
     void setDataProxy(QSurfaceDataProxy *proxy);
@@ -83,7 +83,7 @@ Q_SIGNALS:
     void textureFileChanged(const QString &filename);
 
 protected:
-    explicit QSurface3DSeries(QSurface3DSeriesPrivate *d, QObject *parent = 0);
+    explicit QSurface3DSeries(QSurface3DSeriesPrivate *d, QObject *parent = Q_NULLPTR);
     QSurface3DSeriesPrivate *dptr();
     const QSurface3DSeriesPrivate *dptrc() const;