ListStockExchange.cpp

class ListStockExchange : public StockExchange {

private:
  std::list<Trade *> * trades;

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

  ~ListStockExchange(){
      auto i = trades->begin();
      while (i != trades->end())
      {
          delete (*i);
          trades->erase(i++);
      }
      delete trades;
  }

  void order(int ticket, int amount, int price, bool buy) {
      trades->push_back(new Trade(ticket,amount,price,buy));
  }

  double dayBalance() {
      double balance = 0;
      for(auto tradesIterator = trades->begin(); tradesIterator != trades->end(); tradesIterator++)
          balance += (*tradesIterator)->amount * (*tradesIterator)->price * ((*tradesIterator)->buy ? 1 : -1);
      return balance;
  }
};