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, 1 insertions, 7 deletions

diff --git a/lib/events/directchatevent.cpp b/lib/events/directchatevent.cpp
index 63d638a3..6f5d34f2 100644
--- a/lib/events/directchatevent.cpp
+++ b/lib/events/directchatevent.cpp
@@ -18,18 +18,12 @@
 
 #include "directchatevent.h"
 
-#include "converters.h"
-
 using namespace QMatrixClient;
 
-DirectChatEvent::DirectChatEvent(const QJsonObject& obj)
-    : Event(Type::DirectChat, obj)
-{ }
-
 QMultiHash<QString, QString> DirectChatEvent::usersToDirectChats() const
 {
     QMultiHash<QString, QString> result;
-    const auto json = contentJson();
+    const auto& json = contentJson();
     for (auto it = json.begin(); it != json.end(); ++it)
     {
         // Beware of range-for's over temporary returned from temporary