Using Dynamic objects as Map keys - haxe 3

[Samuel Batista]

Hey guys, I was using the ObjectHash<Array<Event>> class on my project, and I converted it to be a Map<Dynamic, Array<Event>>, I keep crashing when I try to see if an element exists in the map. This is the error I get:

ReferenceError: Error #1069: Property hashCode not found on GameClass and there is no default value.

Should I post a bug report somewhere? Is this Haxe 3 thing or NME thing?

[Juraj Kirchheim]

You should be *very* careful with using `Map<Dynamic, T>` as that can
technically mean everything.

In you particular case, the compiler infers, that you want to use
HashMap, using this implicit conversion:
https://code.google.com/p/haxe/source/browse/trunk/std/Map.hx#134

The solution is to either use ObjectMap<T> or `Map<{}, T>`.

Regards,
Juraj

[Samuel Batista]

That was an interesting suggestion, but unfortunately it gives me a compile error when I try to instantiate Map<{}, Array<_Events.EventHandler>>:

source/game/Events.hx:139: characters 18-52 : Type parameters of multi type abstracts must be known (for _Map.IMap<{ }, Array<_Events.EventHandler>>)

It's not a big deal since I can use Array<Array<_Events.EventHandler>> to implement the desired functionality.

[Juraj Kirchheim]

And have you tried using haxe.ds.ObjectMap?

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[Samuel Batista]

I ended up using haxe.ds.ObjectMap, which works great. Thanks for the suggestion.

[Tom]

Thanks! This saved my day. (Dynamic keys with Map, in Haxe3 dropped some error: hashCode is not a function, but with haxe.ds.ObjectMap everything is fine.)