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, 7 insertions, 10 deletions

diff --git a/lib/events/redactionevent.h b/lib/events/redactionevent.h
index dad54788..8c6cbeff 100644
--- a/lib/events/redactionevent.h
+++ b/lib/events/redactionevent.h
@@ -25,19 +25,16 @@ namespace QMatrixClient
     class RedactionEvent : public RoomEvent
     {
         public:
-            static constexpr const char* typeId() { return "m.room.redaction"; }
+            DEFINE_EVENT_TYPEID("m.room.redaction", RedactionEvent)
 
             explicit RedactionEvent(const QJsonObject& obj)
-                : RoomEvent(Type::Redaction, obj)
-                , _redactedEvent(obj.value("redacts").toString())
-                , _reason(contentJson().value("reason").toString())
+                : RoomEvent(typeId(), obj)
             { }
 
-            const QString& redactedEvent() const { return _redactedEvent; }
-            const QString& reason() const { return _reason; }
-
-        private:
-            QString _redactedEvent;
-            QString _reason;
+            QString redactedEvent() const
+            { return fullJson()["redacts"_ls].toString(); }
+            QString reason() const
+            { return contentJson()["reason"_ls].toString(); }
     };
+    DEFINE_EVENTTYPE_ALIAS(Redaction, RedactionEvent)
 } // namespace QMatrixClient