Class inherit from generic parameter type?

[hqakva]

Does Dart allow to create a class like this?

class GenericBased<T extends Object> extends T {
    final bool myProperties;

    const GenericBased({required this.myProperties})
}

[jakemac53]

No, Dart does not allow this.

[lrhn]

The closest thing is a mixin, but mixins cannot have the constructor you need.

mixin MyProperty {
  bool property = false;
}

class FooWithProperty extends Foo with MyProperty {
  FooWithProperty(bool property) {
    this.property = property;
  }
} 

Without a constructor, it cannot add a final variable that is initialized to different values in different places.

[mateusfccp]

Seems like this is a duplicate of #3552, although this one seems more like a question than a request.