成员的完整列表，这些成员属于 Dtk::Core::QSettingBackend,包括所有继承而来的类成员

doSetOption(const QString &key, const QVariant &value) Q_DECL_OVERRIDE	Dtk::Core::QSettingBackend	protectedvirtualslot
doSync() Q_DECL_OVERRIDE	Dtk::Core::QSettingBackend	protectedvirtualslot
DSettingsBackend(QObject *parent=Q_NULLPTR)	Dtk::Core::DSettingsBackend	inlineexplicit
getOption(const QString &key) const Q_DECL_OVERRIDE	Dtk::Core::QSettingBackend	virtual
keys() const Q_DECL_OVERRIDE	Dtk::Core::QSettingBackend	virtual
optionChanged(const QString &key, const QVariant &value)	Dtk::Core::DSettingsBackend	signal
QSettingBackend(const QString &filepath, QObject *parent=0)	Dtk::Core::QSettingBackend	explicit
setOption(const QString &key, const QVariant &value)	Dtk::Core::DSettingsBackend	signal
sync()	Dtk::Core::DSettingsBackend	signal
~DSettingsBackend() (定义于 Dtk::Core::DSettingsBackend)	Dtk::Core::DSettingsBackend	inlinevirtual
~QSettingBackend() (定义于 Dtk::Core::QSettingBackend)	Dtk::Core::QSettingBackend