[Code] Create singletons with Q_GLOBAL_STATIC macro

src/lib/app/mainapplication.cpp

@@ -914,6 +914,7 @@ void MainApplication::saveSettings()
 
     qzSettings->saveSettings();
     AdBlockManager::instance()->save();
+    IconProvider::instance()->saveIconsToDatabase();
     QFile::remove(currentProfilePath() + "WebpageIcons.db");
     Settings::syncSettings();
 }

src/lib/other/databasewriter.cpp

@@ -19,10 +19,10 @@
 
 #include <QTimer>
 
-DatabaseWriter* DatabaseWriter::s_instance = 0;
+Q_GLOBAL_STATIC(DatabaseWriter, qz_database_writer)
 
-DatabaseWriter::DatabaseWriter(QObject* parent)
-    : QObject(parent)
+DatabaseWriter::DatabaseWriter()
+    : QObject()
 {
 }
 
@@ -34,10 +34,7 @@ void DatabaseWriter::executeQuery(const QSqlQuery &query)
 
 DatabaseWriter* DatabaseWriter::instance()
 {
-    if (!s_instance) {
-        s_instance = new DatabaseWriter;
-    }
-    return s_instance;
+    return qz_database_writer();
 }
 
 void DatabaseWriter::execute()

src/lib/other/databasewriter.h

@@ -28,7 +28,7 @@ class QUPZILLA_EXPORT DatabaseWriter : public QObject
 {
     Q_OBJECT
 public:
-    explicit DatabaseWriter(QObject* parent = 0);
+    explicit DatabaseWriter();
 
     // Delayed execution of query
     void executeQuery(const QSqlQuery &query);
@@ -40,8 +40,6 @@ private slots:
 
 private:
     QVector<QSqlQuery> m_queries;
-
-    static DatabaseWriter* s_instance;
 };
 
 #endif // DATABASEWRITER_H

src/lib/tools/iconprovider.cpp

@@ -24,10 +24,10 @@
 #include <QTimer>
 #include <QBuffer>
 
-IconProvider* IconProvider::s_instance = 0;
+Q_GLOBAL_STATIC(IconProvider, qz_icon_provider)
 
-IconProvider::IconProvider(QWidget* parent)
-    : QWidget(parent)
+IconProvider::IconProvider()
+    : QWidget()
 {
     m_autoSaver = new AutoSaver(this);
     connect(m_autoSaver, SIGNAL(save()), this, SLOT(saveIconsToDatabase()));
@@ -210,10 +210,7 @@ QIcon IconProvider::iconForDomain(const QUrl &url)
 
 IconProvider* IconProvider::instance()
 {
-    if (!s_instance) {
-        s_instance = new IconProvider;
-    }
-    return s_instance;
+    return qz_icon_provider();
 }
 
 void IconProvider::saveIconsToDatabase()

src/lib/tools/iconprovider.h

@@ -38,7 +38,7 @@ class QUPZILLA_EXPORT IconProvider : public QWidget
     Q_PROPERTY(QPixmap bookmarkIcon READ bookmarkIcon WRITE setBookmarkIcon)
 
 public:
-    explicit IconProvider(QWidget* parent = 0);
+    explicit IconProvider();
 
     void saveIcon(WebView* view);
 
@@ -74,8 +74,6 @@ private:
     QVector<BufferedIcon> m_iconBuffer;
 
     AutoSaver* m_autoSaver;
-
-    static IconProvider* s_instance;
 };
 
 #endif // ICONPROVIDER_H