no need for a qRegisterMetatype(), Q_DECLARE_METATYPE does it

plus some docu additions

src/solid/power/inhibition.cpp

@@ -41,7 +41,7 @@ Inhibition::~Inhibition()
 {
     delete d_ptr->backendObject;
     delete d_ptr;
-};
+}
 
 void Inhibition::start()
 {
@@ -58,4 +58,4 @@ Inhibition::State Inhibition::state() const
     return d_ptr->backendObject->state();
 }
 
-#include "inhibition.moc"
\ No newline at end of file
+#include "inhibition.moc"

src/solid/power/power.cpp

@@ -45,7 +45,6 @@ Power* Power::self()
 
 Power::Power(QObject* parent) : QObject(parent), d(new Private)
 {
-    qRegisterMetaType<Solid::Inhibition::State>("Inhibition::State");
     d->notifier = PowerBackendLoader::notifier();
     connect(d->notifier, &PowerNotifier::acPluggedChanged, this, &Power::acPluggedChanged);
 }
@@ -75,4 +74,4 @@ RequestStateJob* Power::requestState(Power::State state, QObject* parent)
     job->setState(state);
 
     return job;
-}
\ No newline at end of file
+}

src/solid/power/power.h

@@ -104,14 +104,19 @@ public:
     explicit Power(QObject* parent = 0);
 
 Q_SIGNALS:
+    /**
+     * Emitted when the system changes the power source
+     * @param plugged whether the system runs on AC
+     */
     void acPluggedChanged(bool plugged);
-private:
 
+private:
     class Private;
-    Private *d;
+    Private * const d;
 };
 }
 
+Q_DECLARE_METATYPE(Solid::Power::State)
 Q_DECLARE_OPERATORS_FOR_FLAGS(Solid::Power::States)
 
 #endif //SOLID_POWER_H