I need help for an error "Should extend by using a class"

Peter_Zhou · October 23, 2021, 8:46am

Please see the below haxe code:

import flash.utils.Dictionary;

class HashMap extends Dictionary <String, Dynamic> implements IMap
{

public function new(param1 : Bool = true)
{
    super(param1);
    return;
}

}

However, it always say “Should extend by using a class”. I think Dictionary is a class. Why openfl doesn’t think it is a class?
Thanks.

obscure · October 24, 2021, 4:15pm

Dictionary ain’t a class it’s an Abstract.

github.com

openfl/openfl/blob/develop/src/openfl/utils/Dictionary.hx#L36


	obj["key"] = "Letters";
	dict[key] == "Letters"; // true
	obj["key"] == "Letters"; // true
	obj[key] == "Letters"; // true because key == "key" is true b/c key.toString == "key"
	dict["key"] == "Letters"; // false because "key" === key is false
	delete dict[key]; //removes the key
	```
**/
@:multiType(K)
abstract Dictionary<K, V>(IMap<K, V>)
{
	/**
		Creates a new Dictionary object. To remove a key from a Dictionary
		object, use the `delete` operator.
		@param weakKeys Instructs the Dictionary object to use "weak"
						references on object keys. If the only reference to an
						object is in the specified Dictionary object, the key
						is eligible for garbage collection and is removed from
						the table when the object is collected.

Peter_Zhou · October 24, 2021, 7:11pm

Thank you for your reply! Dictionary is an Abstract type, not a class. I have to change code. Thank you again!

Best,
Peter Zhou