update settings docs

isettings.h

@@ -27,8 +27,19 @@ enum class SettingsSaveMode: quint64 {
 };
 
 /**
- * @brief The Settings class This is wraper of the QSettings object.
+ * @brief The Settings class base interface for implementation settings backends.
+ * Available implementations:
+ *  Setting (based on QSettings backend)
  * @note This is singleton object.
+ *
+ * @note The all child classes should be initialized before used.
+ *
+ * ```
+ *     auto settingsInstance = Setting::init<Setting>();
+ * ```
+ *
+ * @see ISettings::init method.
+ *
  */
 class QUASARAPPSHARED_EXPORT ISettings : public QObject
 {

settings.cpp

@@ -26,6 +26,10 @@ Settings::Settings() {
     _settings = new QSettings(QSettings::IniFormat, QSettings::Scope::UserScope, company, name);
 }
 
+ISettings *Settings::init() {
+    return ISettings::init<Settings>();
+}
+
 void Settings::syncImplementation() {
     return _settings->sync();
 }

settings.h

@@ -14,13 +14,33 @@
 
 namespace QuasarAppUtils {
 
+/**
+ * @brief The Settings class This is  wraper of the QSettings object.
+ *
+ * Example of initialisation :
+ *
+ *  ```
+ *     auto settingsInstance = Setting::init();
+ *  ```
+ *
+ *  @see Settings::init
+ */
 class QUASARAPPSHARED_EXPORT Settings: public ISettings
 {
 public:
     Settings();
 
+    /**
+    * @brief init This is simple wrapper of the Settings::init method for convenient access to initialisation.
+    * @return instance of the setting.
+    */
+    static ISettings* init();
+
     // ISettings interface
 protected:
+
+
+
     void syncImplementation();
     QVariant getValueImplementation(const QString &key, const QVariant &def);
     void setValueImplementation(const QString key, const QVariant &value);