fstream file("orders.dat", ios::binary | ios::in);
		if (!file) return;

		Order tmp; unsigned sales = 0;
		do
		{
			file.read((char*)&tmp, sizeof(Order));
			if (file && tmp.type == Order::SELL) ++sales; //calculating number of sales

		} while (file);

		Order* selling = new (nothrow) Order[sales]; //sales = number of "SELL" orders
		if (!selling) return;

		unsigned idx = 0;
		file.seekg(0, ios::beg);
		cout << file.tellg() << endl;
		do
		{
			file.read((char*)&tmp, sizeof(Order));
			if (file && tmp.type == Order::SELL)
			{
				cpyOrder(tmp, selling[idx]);
				++idx;
			}

		} while (file);