Bartek Andrzejczak bandrzejczak

	def getSongLength(
	artist: Artist,
	albumName: String,
	songName: String): Option[Int] = {

	for {
	album <- artist.getAlbum(albumName)
	song <- album.getSong(songName)
	} yield song.getLength
	}

	public class ArrayListStockExchange implements StockExchange {

	private List<Trade> trades = new ArrayList<>();

	@Override
	public void order(int ticket, int amount, int price, boolean buy) {
	trades.add(new Trade(ticket, amount, price, buy));
	}

	@Override

	class ListStockExchange : public StockExchange{

	private:
	std::list<Trade > trades;

	public:
	ListStockExchange() {
	trades = new std::list<Trade *>();
	}

	class ListStockExchange : public StockExchange {

	private:
	std::list<Trade > trades;

	public:
	ListStockExchange() {
	trades = new std::list<Trade *>();
	}

	object ScalarPuzzle extends App {

	implicit class TernaryOps(cond: => Boolean) {
	def ??(thenBlock: => Unit) = new {
	def ::(elseBlock: => Unit): Unit =
	if(cond) thenBlock else elseBlock
	}
	}

	(1 + 1 == 2) ?? println("True") :: println("False")