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.

Task-number: QTBUG-45291
Change-Id: I279fd100b61d3e2b2e46e7cbd30cc6b4bfb4d10e
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>

16 files changed, 19 insertions, 19 deletions

diff --git a/src/location/maps/qgeocodereply.h b/src/location/maps/qgeocodereply.h
index f713e421..048493b4 100644
--- a/src/location/maps/qgeocodereply.h
+++ b/src/location/maps/qgeocodereply.h
@@ -63,7 +63,7 @@ public:
         UnknownError
     };
 
-    QGeoCodeReply(Error error, const QString &errorString, QObject *parent = 0);
+    explicit QGeoCodeReply(Error error, const QString &errorString, QObject *parent = Q_NULLPTR);
     virtual ~QGeoCodeReply();
 
     bool isFinished() const;
@@ -83,7 +83,7 @@ Q_SIGNALS:
     void error(QGeoCodeReply::Error error, const QString &errorString = QString());
 
 protected:
-    QGeoCodeReply(QObject *parent = 0);
+    explicit QGeoCodeReply(QObject *parent = Q_NULLPTR);
 
     void setError(Error error, const QString &errorString);
     void setFinished(bool finished);
diff --git a/src/location/maps/qgeocodingmanager.h b/src/location/maps/qgeocodingmanager.h
index b33cda75..eb366f68 100644
--- a/src/location/maps/qgeocodingmanager.h
+++ b/src/location/maps/qgeocodingmanager.h
@@ -78,7 +78,7 @@ Q_SIGNALS:
     void error(QGeoCodeReply *reply, QGeoCodeReply::Error error, QString errorString = QString());
 
 private:
-    QGeoCodingManager(QGeoCodingManagerEngine *engine, QObject *parent = 0);
+    explicit QGeoCodingManager(QGeoCodingManagerEngine *engine, QObject *parent = Q_NULLPTR);
 
     QGeoCodingManagerPrivate *d_ptr;
     Q_DISABLE_COPY(QGeoCodingManager)
diff --git a/src/location/maps/qgeocodingmanagerengine.h b/src/location/maps/qgeocodingmanagerengine.h
index 3e915758..ce7021a0 100644
--- a/src/location/maps/qgeocodingmanagerengine.h
+++ b/src/location/maps/qgeocodingmanagerengine.h
@@ -51,7 +51,7 @@ class Q_LOCATION_EXPORT QGeoCodingManagerEngine : public QObject
 {
     Q_OBJECT
 public:
-    QGeoCodingManagerEngine(const QVariantMap &parameters, QObject *parent = 0);
+    explicit QGeoCodingManagerEngine(const QVariantMap &parameters, QObject *parent = Q_NULLPTR);
     virtual ~QGeoCodingManagerEngine();
 
     QString managerName() const;
diff --git a/src/location/maps/qgeoroutereply.h b/src/location/maps/qgeoroutereply.h
index 52f9133d..318d85f8 100644
--- a/src/location/maps/qgeoroutereply.h
+++ b/src/location/maps/qgeoroutereply.h
@@ -60,7 +60,7 @@ public:
         UnknownError
     };
 
-    QGeoRouteReply(Error error, const QString &errorString, QObject *parent = 0);
+    explicit QGeoRouteReply(Error error, const QString &errorString, QObject *parent = Q_NULLPTR);
     virtual ~QGeoRouteReply();
 
     bool isFinished() const;
@@ -77,7 +77,7 @@ Q_SIGNALS:
     void error(QGeoRouteReply::Error error, const QString &errorString = QString());
 
 protected:
-    QGeoRouteReply(const QGeoRouteRequest &request, QObject *parent = 0);
+    explicit QGeoRouteReply(const QGeoRouteRequest &request, QObject *parent = Q_NULLPTR);
 
     void setError(Error error, const QString &errorString);
     void setFinished(bool finished);
diff --git a/src/location/maps/qgeoroutingmanager.h b/src/location/maps/qgeoroutingmanager.h
index 0648a15b..56cd8e51 100644
--- a/src/location/maps/qgeoroutingmanager.h
+++ b/src/location/maps/qgeoroutingmanager.h
@@ -77,7 +77,7 @@ Q_SIGNALS:
     void error(QGeoRouteReply *reply, QGeoRouteReply::Error error, QString errorString = QString());
 
 private:
-    QGeoRoutingManager(QGeoRoutingManagerEngine *engine, QObject *parent = 0);
+    explicit QGeoRoutingManager(QGeoRoutingManagerEngine *engine, QObject *parent = Q_NULLPTR);
 
     QGeoRoutingManagerPrivate *d_ptr;
     Q_DISABLE_COPY(QGeoRoutingManager)
diff --git a/src/location/maps/qgeoroutingmanagerengine.h b/src/location/maps/qgeoroutingmanagerengine.h
index 9fa02727..21aef7ce 100644
--- a/src/location/maps/qgeoroutingmanagerengine.h
+++ b/src/location/maps/qgeoroutingmanagerengine.h
@@ -51,7 +51,7 @@ class Q_LOCATION_EXPORT QGeoRoutingManagerEngine : public QObject
 {
     Q_OBJECT
 public:
-    QGeoRoutingManagerEngine(const QVariantMap &parameters, QObject *parent = 0);
+    explicit QGeoRoutingManagerEngine(const QVariantMap &parameters, QObject *parent = Q_NULLPTR);
     virtual ~QGeoRoutingManagerEngine();
 
     QString managerName() const;
diff --git a/src/location/places/qplacecontentreply.h b/src/location/places/qplacecontentreply.h
index 1d824485..fa96a0e2 100644
--- a/src/location/places/qplacecontentreply.h
+++ b/src/location/places/qplacecontentreply.h
@@ -49,7 +49,7 @@ class Q_LOCATION_EXPORT QPlaceContentReply : public QPlaceReply
     Q_OBJECT
 
 public:
-    explicit QPlaceContentReply(QObject *parent = 0);
+    explicit QPlaceContentReply(QObject *parent = Q_NULLPTR);
     virtual ~QPlaceContentReply();
 
     QPlaceReply::Type type() const;
diff --git a/src/location/places/qplacedetailsreply.h b/src/location/places/qplacedetailsreply.h
index c9530c34..09593a1e 100644
--- a/src/location/places/qplacedetailsreply.h
+++ b/src/location/places/qplacedetailsreply.h
@@ -47,7 +47,7 @@ class Q_LOCATION_EXPORT QPlaceDetailsReply : public QPlaceReply
 {
     Q_OBJECT
 public:
-    explicit QPlaceDetailsReply(QObject *parent = 0);
+    explicit QPlaceDetailsReply(QObject *parent = Q_NULLPTR);
     virtual ~QPlaceDetailsReply();
 
     QPlaceReply::Type type() const;
diff --git a/src/location/places/qplaceidreply.h b/src/location/places/qplaceidreply.h
index abdab7aa..ea44828b 100644
--- a/src/location/places/qplaceidreply.h
+++ b/src/location/places/qplaceidreply.h
@@ -55,7 +55,7 @@ public:
         RemoveCategory
     };
 
-    explicit QPlaceIdReply(OperationType operationType, QObject *parent = 0);
+    explicit QPlaceIdReply(OperationType operationType, QObject *parent = Q_NULLPTR);
     virtual ~QPlaceIdReply();
 
     QPlaceReply::Type type() const;
diff --git a/src/location/places/qplacemanager.h b/src/location/places/qplacemanager.h
index 37e7c053..bd4b1676 100644
--- a/src/location/places/qplacemanager.h
+++ b/src/location/places/qplacemanager.h
@@ -112,7 +112,7 @@ Q_SIGNALS:
     void dataChanged();
 
 private:
-    QPlaceManager(QPlaceManagerEngine *engine, QObject *parent = 0);
+    explicit QPlaceManager(QPlaceManagerEngine *engine, QObject *parent = Q_NULLPTR);
     Q_DISABLE_COPY(QPlaceManager)
 
     QPlaceManagerEngine *d;
diff --git a/src/location/places/qplacemanagerengine.h b/src/location/places/qplacemanagerengine.h
index aca0a875..0c11278f 100644
--- a/src/location/places/qplacemanagerengine.h
+++ b/src/location/places/qplacemanagerengine.h
@@ -53,7 +53,7 @@ class Q_LOCATION_EXPORT QPlaceManagerEngine : public QObject
     Q_OBJECT
 
 public:
-    QPlaceManagerEngine(const QVariantMap &parameters, QObject *parent = 0);
+    explicit QPlaceManagerEngine(const QVariantMap &parameters, QObject *parent = Q_NULLPTR);
     virtual ~QPlaceManagerEngine();
 
     QString managerName() const;
diff --git a/src/location/places/qplacematchreply.h b/src/location/places/qplacematchreply.h
index e5935e33..df4b3fda 100644
--- a/src/location/places/qplacematchreply.h
+++ b/src/location/places/qplacematchreply.h
@@ -47,7 +47,7 @@ class Q_LOCATION_EXPORT QPlaceMatchReply : public QPlaceReply
 {
     Q_OBJECT
 public:
-    explicit QPlaceMatchReply(QObject *parent = 0);
+    explicit QPlaceMatchReply(QObject *parent = Q_NULLPTR);
     ~QPlaceMatchReply();
 
     QPlaceReply::Type type() const;
diff --git a/src/location/places/qplacereply.h b/src/location/places/qplacereply.h
index 987ab446..374c68b3 100644
--- a/src/location/places/qplacereply.h
+++ b/src/location/places/qplacereply.h
@@ -71,7 +71,7 @@ public:
         MatchReply
     };
 
-    explicit QPlaceReply(QObject *parent = 0);
+    explicit QPlaceReply(QObject *parent = Q_NULLPTR);
     ~QPlaceReply();
 
     bool isFinished() const;
@@ -89,7 +89,7 @@ Q_SIGNALS:
     void error(QPlaceReply::Error error, const QString &errorString = QString());
 
 protected:
-    QPlaceReply(QPlaceReplyPrivate *, QObject *parent = 0);
+    explicit QPlaceReply(QPlaceReplyPrivate *, QObject *parent = Q_NULLPTR);
     void setFinished(bool finished);
     void setError(QPlaceReply::Error error, const QString &errorString);
     QPlaceReplyPrivate *d_ptr;
diff --git a/src/location/places/qplacesearchreply.h b/src/location/places/qplacesearchreply.h
index ddf850bc..52c88899 100644
--- a/src/location/places/qplacesearchreply.h
+++ b/src/location/places/qplacesearchreply.h
@@ -49,7 +49,7 @@ class Q_LOCATION_EXPORT QPlaceSearchReply : public QPlaceReply
 {
     Q_OBJECT
 public:
-    explicit QPlaceSearchReply(QObject *parent = 0);
+    explicit QPlaceSearchReply(QObject *parent = Q_NULLPTR);
     ~QPlaceSearchReply();
 
     QPlaceReply::Type type() const;
diff --git a/src/location/places/qplacesearchsuggestionreply.h b/src/location/places/qplacesearchsuggestionreply.h
index 6aee36cb..3909b14f 100644
--- a/src/location/places/qplacesearchsuggestionreply.h
+++ b/src/location/places/qplacesearchsuggestionreply.h
@@ -49,7 +49,7 @@ class Q_LOCATION_EXPORT QPlaceSearchSuggestionReply : public QPlaceReply
 {
     Q_OBJECT
 public:
-    explicit QPlaceSearchSuggestionReply(QObject *parent = 0);
+    explicit QPlaceSearchSuggestionReply(QObject *parent = Q_NULLPTR);
     ~QPlaceSearchSuggestionReply();
 
     QStringList suggestions() const;
diff --git a/src/positioning/qnmeapositioninfosource.h b/src/positioning/qnmeapositioninfosource.h
index 9bb67c9f..5cb28aca 100644
--- a/src/positioning/qnmeapositioninfosource.h
+++ b/src/positioning/qnmeapositioninfosource.h
@@ -49,7 +49,7 @@ public:
         SimulationMode
     };
 
-    explicit QNmeaPositionInfoSource(UpdateMode updateMode, QObject *parent = 0);
+    explicit QNmeaPositionInfoSource(UpdateMode updateMode, QObject *parent = Q_NULLPTR);
     ~QNmeaPositionInfoSource();
 
     void setUserEquivalentRangeError(double uere);