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Originally there was an idea to make a common base class for all event content. Aside from really trivial unification of toJson() this doesn't span across various types of events, and since state events use static, rather than dynamic, polymorphism (StateEvent<> is a template with the aggregated content vs. RoomMessageEvent with the aggregated pointer-to-content-base), there's no considerable value in using the base class. If state events start using the same approach as message events, this may be brought back but not until then.
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...that creates an "empty" event, i.e. an event with content initialised by a default constructor (not all content types support this but those for simple events do).
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We now have event.*, roomevent.*, stateevent.* and eventloader.h. If you only use event leaf-classes (such as RoomMemberEvent) you shouldn't notice anything.
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code into blocks
A template member variable in it seemed to cause internal compiler error in MSVC 2017, let alone MSVC 2015...
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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.
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The latter one causes linkage errors when used from a template method (but not from a template class, puzzlingly).
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It's been long overdue to separate them from the rest of the stuff (docs etc.). Also, this allows installing to a directory within the checked out git tree (say, ./install/, similar to ./build/).
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