C++ 存储文件时遇到问题，需要跨越所有行，但最后一行除外

我试图将文件数据发送到一个istream变量，该变量在最后一行之前停止读取，并在存储之前离开。有没有一种简单的实现方法？停止字符或类似的东西

    istream& TransactionList::getDataFromStream( istream& is) {
    //read in (unformatted) transaction list from input stream
    Transaction aTransaction;
    is >> aTransaction; //read first transaction
    while ( is != 0)    
    {       ^^^^^^^
        listOfTransactions_.addAtEnd( aTransaction);   //add transaction to list of transactions
        is >> aTransaction; //read in next transaction
    }
    return is;
}

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简单。检查它是否不是最后一次。你可能想检查一下EOF

   istream& TransactionList::getDataFromStream( istream& is) {
    //read in (unformatted) transaction list from input stream
    Transaction aTransaction;
    Transaction aNextTransaction;
    is >> aTransaction; //read first transaction
    while ( !is.eof())    
    {       ^^^^^^^
        aTransaction = aNextTransaction;
        is >> aNextTransaction; //read in next transaction
        // last read didn't set EOF, so its not the last line. Add the previous.
        if (!is.eof())
            listOfTransactions_.addAtEnd( aTransaction);   //add transaction to list of transactions
    }
    return is;
}

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谢谢，如果有可能没有交易，考虑到每个交易在同一行中都包含一个“/”，我会在函数中加入什么？