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Difference Between fstream class's

 
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Difference Between fstream class's, ifstream, fstream, ofstream
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19 Dec, 2007 - 03:01 PM
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So I am reading threw some reference material and notice that I did not learn 1 other fstream class during into to C++.

I learned ifstream is for input and ofstream is for output to files. But their is fstream that dose both read and write data to files. So what is the difference between using fstream or ifstream to write data to a file?
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Bench
RE: Difference Between Fstream Class's
19 Dec, 2007 - 04:25 PM
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To start with, you can't use ifstream to write to files. And this is exactly why you might want to use it. One of the best ways to keep others who use your code from doing something stupid (like using an input stream to write to a file), is to impose a technical restriction which prevents them from doing so.
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RE: Difference Between Fstream Class's
19 Dec, 2007 - 05:34 PM
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So its better to uses ifstream and ofstream because it prevents errors and mistakes from the user?
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Bench
RE: Difference Between Fstream Class's
20 Dec, 2007 - 04:05 AM
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Not from the user, but from others who use your code (or yourself, perhaps after a prolonged period of time away from that code). For example, if you wrote a function whose sole purpose was to read a line of data from a file, parse that line, and then return an object, you'd want to make sure that the caller hadn't sent an fstream which had been opened for output. The best way to do that is to force the caller to provide an ifstream instead.

This post has been edited by Bench: 20 Dec, 2007 - 04:06 AM
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RE: Difference Between Fstream Class's
20 Dec, 2007 - 05:17 AM
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O ok yeah that makes sense.

Thanks for clearing that up.
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Lizardking
RE: Difference Between Fstream Class's
21 Apr, 2008 - 12:53 PM
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ifstream and ofstream. Do you manually need to make a file lets say ("infile.dat") do you actually need to make the file? or does the code do it for you? and if you do what exactly must you do to make your code work with Fstream.
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