Event types system remade to be extensible

There were two common points that had to be updated every time a new event is introduced:
the EventType enumeration and one of 3 doMakeEvent<> specialisations. The new code
has a template class, EventFactory<>, that uses a list of static factory methods
to create events instead of typelists used in doMakeEvent<>(); the EventType enumeration
is replaced with a namespace populated with constants as necessary.

In general, EventType is considered a deprecated mechanism altogether; instead, a set
of facilities is provided: is<>() to check if an event has a certain type (to replace
comparison against an EventType value) and visit<>() to execute actions based on
the event type (replacing switch statements over EventType values).

Closes #129.

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/events/receiptevent.h b/lib/events/receiptevent.h
index e8d3a65f..10b3f631 100644
--- a/lib/events/receiptevent.h
+++ b/lib/events/receiptevent.h
@@ -39,14 +39,14 @@ namespace QMatrixClient
     class ReceiptEvent: public Event
     {
         public:
+            DEFINE_EVENT_TYPEID("m.receipt", ReceiptEvent)
             explicit ReceiptEvent(const QJsonObject& obj);
 
-            EventsWithReceipts eventsWithReceipts() const
+            const EventsWithReceipts& eventsWithReceipts() const
             { return _eventsWithReceipts; }
 
-            static constexpr const char* typeId() { return "m.receipt"; }
-
         private:
             EventsWithReceipts _eventsWithReceipts;
     };
+    DEFINE_EVENTTYPE_ALIAS(Receipt, ReceiptEvent)
 }  // namespace QMatrixClient