Filestream

[cyberphant0m]

Im trying to write a simple card game, and I have a BunchOfCards class to represent collections of cards. Im trying to overload the << operator, so that a filestream binded to a formatted text file, will fill that collection with Card objects.

The code I have is for the overloaded operator, below, and the driver program to test it. I checked www.cplusplus.com reference, and it says that ifstream and fstream inherit the getline() method, but i've tried both, and my compiler (Dev-C++) tells me theres no matching function for it.

Can anyone help? Thanks

 

[Barnaby W. Füi]

First off you should probably use istream instead of fstream. You're just taking input, and you shouldn't care whether it's a file or a socket or a punch card reader.

And second you should follow the convention used by e.g. cin:

cin >> myint;

myfstream >> mybunchofcards;

instead of:

mybunchofcards << myfstream;

I believe you need to make the operator standalone in order to do that, so instead of having a method operator<<, you'd have a standalone operator>>:

std::istream&amp; operator>> (std::istream&amp; is, BunchOfCards&amp; boc) // return a reference; you don't want to create a copy
{
// take input from 'is', and return is
}

oh, and not *all* operators return *this 😉 (comparison operators return bool, for example)

 

[cyberphant0m]

followup question:

i have a ifstream object:

ifstream f;

how would I read just the first line from this file stream into a string variable:

string lineBuffer;

I've tried several different solutions, but none of these have worked (at least on my computer / compiler). These are the two that came the "closest" to working out
😕 :

 

[Barnaby W. Füi]

std::getline(my_ifstream, my_string);

 

[cyberphant0m]

cool, ill try it soon as I get home, since im posting from school