Trouble storing from file, need all lines to be transefred across but the last

Question

I'm trying to send file data to an istream variable that stops reading before the last line and leaves before that is stored. Is there a simple way of implementing it? A stop character or something of the like?

    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;
}

Answer 1

Simple. Check that its not last. And you probably want to check for 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;
}