How to check whether an object's class included a mixin in Dart?

Question

How do I check whether an object's class included a mixin? For example:

class AClass extends Object with MyMixin {}
class BClass extends Object              {}

classIncludesMixin(new AClass(), 'MyMixin'); // => true
classIncludesMixin(new BClass(), 'MyMixin'); // => false

What should be in this classIncludesMixin() method in order for it to work?

Answer 1

You can simply use a type check o is MyMixin (that will be also true for inheritance and implementation).

If you really have to check the mixin clause you have to use dart:mirrors :

bool classIncludesMixin(o, String mixinName) {
  var c = reflect(o).type;
  while (c != null) {
    var m = c.mixin;
    if (c != m && m.simpleName == new Symbol(mixinName)) return true;
    c = c.superclass;
  }
  return false;
}