[Bug libstdc++/45628] std::fstream::tellg invalidates I/O buffer

[potswa at mac dot com]

------- Comment #41 from potswa at mac dot com  2010-09-17 19:04 -------
Well, I'm happy if you'd like to merge the diffs. My code was written with the
intent of optimizing the output case, too, but I guess it's not too inefficient
or awkward from the perspective of input only.

I just filed a bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45708 about the
requirement to separate reads and writes. I suppose it will be a duplicate, but
maybe it is worded a little better than existing bugs. Although your current
users might know the restriction, I don't think it's really well-documented. I
personally observed this behavior when getting started with iostreams, and it
was quite discouraging. GNU having a large part of the iostreams marketshare, I
wouldn't be surprised if this were a minor stumbling block to iostreams
adoption overall.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45628