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, 4 deletions

diff --git a/lib/events/typingevent.h b/lib/events/typingevent.h
index 6ccbc1c8..0c4b350d 100644
--- a/lib/events/typingevent.h
+++ b/lib/events/typingevent.h
@@ -20,20 +20,19 @@
 
 #include "event.h"
 
-#include <QtCore/QStringList>
-
 namespace QMatrixClient
 {
     class TypingEvent: public Event
     {
         public:
-            static constexpr const char* typeId() { return "m.typing"; }
+            DEFINE_EVENT_TYPEID("m.typing", TypingEvent)
 
             TypingEvent(const QJsonObject& obj);
 
-            QStringList users() const { return _users; }
+            const QStringList& users() const { return _users; }
 
         private:
             QStringList _users;
     };
+    DEFINE_EVENTTYPE_ALIAS(Typing, TypingEvent)
 }  // namespace QMatrixClient