Does overloaded istream operators overload ifstream as well?

Hey, all! It's been a while. I am having a strange problem which doesn't seem right. I have a class I created that I am trying overload the insertion operator (>>). I do so with this code:

Code:

---

istream &operator>>(istream &in, Student &studentcopy)
{
    in >> studentcopy.ssn >> studentcopy.creditsToDate >> studentcopy.pointsToDate;

    return in;
}

---

Inside the main/driver program code I open and read the data from a file. However, when I use the insertion op (>>), it doesn't read anything from the file. It will read the data in from the keyboard (i.e. it overloads fine with cin), however it gets nothing from a file. The file opens fine and the data is structured ok. I always thought that an ifstream object was also considered an istream.

I also created another overloaded operator function but instead of istream I made it ifstream. Still nothing, though. Anyone have any ideas? Thanks

have you included fstream, and done something like " infile >> " without the quotes? show some code.

edit: for show code, i mean, like main.

What does your file look like? Remember >> will read up to a whitespace.

The file is actually only one line long for now and is like so:

2 123456789 25 100

and the main code is like so:

Code:

---

......

inFile >> iCode;          // an integer

inFile >> sStudent;    // long int, int, int

......

---

>>The file is actually only one line long for now and is like so:

>>2 123456789 25 100

The file doesnt look like that to the eye though right? If so, then you are trying to read a textfile and assign the data to an int or long......if the real numbers are stored in a file, you whould not be able to view them in a text editor

Yes, you can read the file (i.e. its a text file). It works fine now, though. It was an old bug in MSVC++ (I never updated). I compiled through g++ and it worked ok.

Fordy, I think you are thinking of binary-file-I/O. I'm not doing that. You can read from a text file and assign it to ints and such (the standard library takes care of that).

Thanks anyway guys.