dart - How to implement Iterable<E> -

i trying port java code below dart , puzzled this.

in java iterable interface clean 1 method , implement snap.

how code best transformed dart?

/**  * chess squares represented bitmap.  */ public class chesssquares implements iterable<chesssquare> {  private static class chesssquaresiterator implements iterator<chesssquare> {     long bits;     int nextbit;      public chesssquaresiterator(long bits) {         this.bits = bits;         nextbit = long.numberoftrailingzeros(bits);     }      @override     public boolean hasnext() {         return (nextbit < 64);     }      @override     public chesssquare next() {         chesssquare sq = chesssquare.values()[nextbit];         bits = bits & ~sq.bit;         nextbit = long.numberoftrailingzeros(bits);         return sq;     }      @override     public void remove() {         throw new unsupportedoperationexception();     } }   @override public iterator<chesssquare> iterator() {     return new chesssquaresiterator(bits); }  ... 

by using iterablemixin need implement iterator-function.

class chesssquares extends object iterablemixin<chesssquare> {     iterator<chesssquare> iterator() => new chesssquaresiterator(bits);     ... } 

visit http://blog.sethladd.com/2013/03/first-look-at-dart-mixins.html short introduction on mixins.

the iterator-interface straight forward. have implement function movenext , getter current.