I’m trying to implement generic multi-map in Haxe and this is what I’ve got so far:
Error: Abstract MultiMap has no @:to function that accepts Map<String, Array> is confusing me (shouldn’t @:to function have NO arguments??) and I have no idea what to do next.
I have tried creating MultiMap class which encapsulates Map<K, Array> but in that case constructor like this:
class MultiMap< K, V > {
...
public function new() {
this.map = new Map<K, Array<V>>();
}
doesn’t compile.
I don’t have to use abstract for generic multi-map, if someone has a better idea, please post it here.
The only other option I see now is to code specialized multi-map class for each combination of K, V I have in my code
Not when it’s a @:multiType abstract that has to be specialized to a concrete implementation. Have a look at the implementation of Map, you can probably get away with defining @:to functions analogous to those.
When I’m in a supermarket and spend 10-15 minutes looking for something, I usually go and find someone who works there and ask them where they’re keeping such-and-such thing. More often than not, they just point at the shelf right behind me and say: “It’s there”.
I did look at the source of Map, but didn’t scroll all the way to bottom where you can find @:to functions for concrete casts.
Thanks Jens!
Here is fixed and working multi-map for String keys, adding other @:to functions will cover the rest of the key types:
