Zip for SolidList

zip.java

/**
 * Returns a new stream that contains items that has been received by sequentially combining items of the streams into pairs
 * and then applying given function to each pair of items.
 *
 * @param with a {@link Stream} to zip current stream with.
 * @param func a function that takes an item of the current stream and an item of another stream
 *             and returns a corresponding value for the new stream.
 * @param <S>  a type of a stream to zip current stream with.
 * @param <R>  a type of items new stream returns.
 * @return a new stream that contains items that has been received by sequentially combining items of the streams into pairs
 * and then applying given function to each pair of items.
 */
public <S, R> Stream<R> zipWith(final Stream<? extends S> with, final Func2<? super T, ? super S, ? extends R> func) {
    return new Stream<R>() {
        @Override
        public Iterator<R> iterator() {
            return new ReadOnlyIterator<R>() {

                Iterator<T> iterator = Stream.this.iterator();
                Iterator<? extends S> withIterator = with.iterator();

                @Override
                public boolean hasNext() {
                    return iterator.hasNext() && withIterator.hasNext();
                }

                @Override
                public R next() {
                    return func.call(iterator.next(), withIterator.next());
                }
            };
        }
    };
}