thermostat: settings: don't use another QSettings instance

soft/thermostat/inc/settings.h

@@ -41,7 +41,7 @@ public:
 	struct Brocker m_broker;
 
 private:
-	Settings(void);
+	explicit Settings(QObject *parent = Q_NULLPTR);
 	~Settings(void);
 	static Settings *_singleton;
 

soft/thermostat/src/settings.cpp

@@ -7,42 +7,42 @@
  */
 
 #include <QTranslator>
+#include <QSettings>
 #include <QString>
 
 #include "settings.h"
 
 Settings *Settings::_singleton = NULL;
 
-Settings::Settings(void)
+Settings::Settings(QObject *parent) : QSettings(parent)
 {
-	QSettings s;
 	struct Room room;
 	struct Heater heater;
 	int nb_rooms;
 
-	nb_rooms = s.beginReadArray("rooms");
+	nb_rooms = this->beginReadArray("rooms");
 	if (nb_rooms > MAX_NB_ZONES) {
 		// TODO;
 		nb_rooms = MAX_NB_ZONES;
 	}
 
 	for (int i = 0; i < nb_rooms; ++i) {
-		s.setArrayIndex(i);
-		room.name = s.value("name", "").toString();
-		room.sensor_topic = s.value("sensor_topic", "").toString();
-		room.availability_topic = s.value("availability_topic", "").toString();
-		int size = s.beginReadArray("heaters");
+		this->setArrayIndex(i);
+		room.name = this->value("name", "").toString();
+		room.sensor_topic = this->value("sensor_topic", "").toString();
+		room.availability_topic = this->value("availability_topic", "").toString();
+		int size = this->beginReadArray("heaters");
 		for (int j = 0; j < size; ++j) {
-			s.setArrayIndex(j);
-			heater.ctrl_topic = s.value("control_topic", "").toString();
+			this->setArrayIndex(j);
+			heater.ctrl_topic = this->value("control_topic", "").toString();
 			room.heaters << heater;
 		}
-		s.endArray();
+		this->endArray();
 		m_rooms << room;
 	}
-	s.endArray();
-	m_broker.address = s.value("broker/address", "localhost").toString();
-	m_broker.port = s.value("broker/port", 1883).toInt();
+	this->endArray();
+	m_broker.address = this->value("broker/address", "localhost").toString();
+	m_broker.port = this->value("broker/port", 1883).toInt();
 }
 
 int Settings::nbZones(void)
@@ -57,7 +57,7 @@ Settings::~Settings(void)
 Settings *Settings::getInstance(void)
 {
 	if (!_singleton) {
-		_singleton =  new Settings;
+		_singleton =  new Settings();
 	}
 
 	return _singleton;